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JP2018042040

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DESCRIPTION JP2018042040
Abstract: To extract a target signal from an input signal without providing three or more sensors
in a terminal device. A terminal device having only two of a first sensor and a second sensor in an
outer peripheral portion as signal input means, wherein a straight line connecting the first sensor
and the second sensor is any one of the terminal devices. The signal processing means is
provided with signal processing means for emphasizing or suppressing the signal using the
arrival time difference of the signals arriving at the first sensor and the second sensor from the
outside of the terminal device, not parallel to the outer periphery. [Selected figure] Figure 1
Terminal device, control method thereof and control program
[0001]
The present invention relates to a technique for emphasizing or suppressing a signal arriving
from the outside of a device.
[0002]
In the above technical field, techniques for emphasizing or suppressing a signal arriving from the
outside of the device are described in Patent Documents 1 to 4.
[0003]
In Patent Document 1, four microphones are provided only at the top of the case in a rectangular
flat-plate portable terminal device, and the sound source direction of the sound generated around
is detected based on the time difference of signal arrival to each microphone Technology is
disclosed.
03-05-2019
1
[0004]
In Patent Document 2, two non-directional microphones are provided only on the lower side of a
casing in a rectangular flat-plate portable terminal device, voices arriving from different
directions are acquired, and different gains according to the direction of arrival are applied. A
technique for performing volume correction is disclosed.
[0005]
In Patent Document 3, a total of three microphones are arranged on only two opposite sides of a
casing in a rectangular flat-plate portable terminal device so that the mutual intervals are all
different, and two of them are selected. There is disclosed a technique for suppressing noise by
determining the position of a sound source while obtaining high signal separation performance
over a wide frequency band.
[0006]
According to Patent Document 4, from the microphone group consisting of three or more
microphones, the microphone pair consisting of two microphones is selected based on the
holding direction of the device or the signal arrival direction and used to hold the terminal. An
apparatus is disclosed that is capable of forming directivity that is suitable for the desired signal,
regardless of direction.
[0007]
JP, 2013-183286, A JP, 2011-205324, A JP, 2008-092512, A JP, 2012-524505, A Japanese
Patent Application No. 2014-228497, A Japanese Patent Application No. 2015-033430, A
[0008]
1982
January, I.E.E. Transactions-On Signal Processing, Vol. 30, No. 1, (IEEE TRANSACTIONS ON
ANTENNAS AND PROPAGATIONS, VOL. 30, NO. 1, PP. 27-34 , Jan.
1982) 27Page 34 August 1972, Proceedings of IEE, vol. 60, No. 8, (IEEE PROCEEDINGS OF IEEE,
vol. 60, NO. 8, PP. 926-934, Aug. .
03-05-2019
2
1972) 926934Page 934 October 1999, I.E.E. Transactions on Signal Processing, Vol. 47, No. 10,
(IEEE TRANSACTIONS ON SIGNAL PROCESSING, VOL. 47, NO. 10, PP. 2677-2684, Oct.
1999) 2677Page 2684 "Handbook of Speech Processing", Springer, Berlin Heidelberg, New York
(HANDBOOK OF SPEECH PROCESSING, SPRINGER, BERLIN HEIDELBERG NEW YORK, 2008.
)
[0009]
However, in the above-mentioned prior art, two sensors could not be used to selectively
emphasize or suppress signals coming to the terminal from the outside.
[0010]
An object of the present invention is to provide a technique for solving the above-mentioned
problems.
[0011]
In order to achieve the above object, a device according to the present invention is a terminal
device provided with only two of a first sensor and a second sensor at an outer peripheral
portion as signal input means, the first sensor and the second The straight line connecting with
the sensor is not parallel to any of the outer periphery of the terminal device, and the signal is
emphasized using the difference in arrival time of the signals that reach the first sensor and the
second sensor from the outside of the terminal device Or it is a terminal device provided with the
signal processing means to suppress.
[0012]
In order to achieve the above object, a method according to the present invention is a control
method of a terminal device provided with only two of a first sensor and a second sensor as
signal input means, comprising the first sensor and the second sensor. The straight line
connecting with the sensor is not parallel to any of the outer periphery of the terminal device,
and the signal is emphasized using the difference in arrival time of the signals that reach the first
sensor and the second sensor from the outside of the terminal device Or it is the control method
of the terminal device to suppress.
03-05-2019
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[0013]
In order to achieve the above object, a program according to the present invention is a control
program of a terminal device provided with only two of a first sensor and a second sensor in an
outer peripheral portion as signal input means, The straight line connecting to the second sensor
is not parallel to any outer periphery of the terminal device, and the difference in arrival time of
the signals arriving at the first sensor and the second sensor from the outside of the terminal
device is used to It is a control program which makes a terminal apparatus perform the step of
emphasizing or suppressing a signal.
[0014]
In order to achieve the above object, another device according to the present invention is a
terminal device whose outer periphery is formed in a polygon having a pentagon or more, and as
a signal input means, first sensors at adjacent corners of the outer peripheral portion. And a
second sensor, and signal processing means for emphasizing or suppressing the signal using the
difference in arrival time of the signals arriving at the first sensor and the second sensor from the
outside of the terminal device It is a terminal device.
[0015]
In order to achieve the above object, another method according to the present invention is a
control method of a terminal device in which the outer periphery is formed in a polygon having a
pentagon or more, and as a signal input means, adjacent corners of the outer peripheral portion
A signal processing step comprising only two of a first sensor and a second sensor, and
emphasizing or suppressing the signal using an arrival time difference of the signals arriving at
the first sensor and the second sensor from the outside of the terminal device And a control
method of a terminal device including the
[0016]
In order to achieve the above object, another program according to the present invention is a
control program of a terminal device whose outer periphery is formed in a polygon having a
pentagon or more, and as a signal input means, at adjacent corners of the outer peripheral
portion. A signal processing step comprising only two of a first sensor and a second sensor, and
emphasizing or suppressing the signal using an arrival time difference of the signals arriving at
the first sensor and the second sensor from the outside of the terminal device Is a control
program of a terminal device including
[0017]
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According to the present invention, two sensors can be used to selectively enhance or suppress
signals coming to the terminal from the outside.
[0018]
It is a block diagram showing composition of a terminal unit concerning a 1st embodiment of the
present invention.
It is a block diagram showing functional composition of a terminal unit concerning a 2nd
embodiment of the present invention.
It is a figure for demonstrating the external appearance structure and signal processing of the
terminal device which concern on 2nd Embodiment of this invention.
It is a figure for demonstrating the external appearance structure and signal processing of the
terminal device which concern on 2nd Embodiment of this invention.
It is a figure for demonstrating the external appearance structure and signal processing of the
terminal device which concern on 2nd Embodiment of this invention.
It is a figure for demonstrating the external appearance structure and signal processing of the
terminal device which concern on 2nd Embodiment of this invention.
It is a figure for demonstrating the external appearance structure and signal processing of the
terminal device which concern on 2nd Embodiment of this invention.
It is a figure for demonstrating the external appearance structure and signal processing of the
terminal device which concern on 2nd Embodiment of this invention.
It is a figure for demonstrating the external appearance structure and signal processing of the
terminal device which concern on 2nd Embodiment of this invention.
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It is a figure for demonstrating the external appearance structure and signal processing of the
terminal device which concern on 2nd Embodiment of this invention.
It is a figure for demonstrating the external appearance structure and signal processing of the
terminal device which concern on 3rd Embodiment of this invention.
It is a figure for demonstrating the external appearance structure and signal processing of the
terminal device which concern on 4th Embodiment of this invention.
It is a figure for demonstrating the external appearance structure and signal processing of the
terminal device which concern on 5th Embodiment of this invention. It is a figure for
demonstrating the external appearance structure and signal processing of the terminal device
which concern on 5th Embodiment of this invention. It is a figure for demonstrating the external
appearance structure and signal processing of the terminal device which concern on 5th
Embodiment of this invention. It is a block diagram which shows the function structure of the
terminal device which concerns on 6th Embodiment of this invention. It is a top view for
demonstrating the signal processing of the terminal device which concerns on 6th Embodiment
of this invention. It is a figure for demonstrating the signal processing of the terminal device
which concerns on 6th Embodiment of this invention. It is a figure explaining the structure of the
terminal device which concerns on 7th Embodiment of this invention. It is a figure explaining the
structure of the terminal device which concerns on 7th Embodiment of this invention. It is a
figure explaining the structure of the terminal device which concerns on 8th Embodiment of this
invention. It is a figure explaining the structure of the terminal device which concerns on 8th
Embodiment of this invention.
[0019]
Hereinafter, embodiments of the present invention will be exemplarily described in detail with
reference to the drawings. However, the component described in the following embodiment is an
illustration to the last, and it is not a thing of the meaning which limits the technical scope of this
invention only to them. Further, the "audio signal" in the following description is a direct
electrical change that occurs in accordance with speech or other sounds, and is for transmitting
speech or other sounds, and is not limited to speech.
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[0020]
First Embodiment A terminal device 100 according to a first embodiment of the present
invention will be described with reference to FIG. FIG. 1 is a diagram showing the configuration
of the terminal device 100. As shown in FIG.
[0021]
The terminal device 100 includes only two of the sensor 101 and the sensor 102 as signal input
means. The straight line L connecting sensor 101 and sensor 102 is not parallel to any outer
perimeter of the device. For this reason, as long as one of the sides of the outer peripheral
portion of the terminal device 100 is kept horizontal, the signals arriving at the sensor 101 and
the sensor 102 of the terminal device 100 have a nonzero arrival time difference regardless of
the holding direction.
[0022]
The terminal device 100 further includes a signal processing unit 103, and performs emphasis or
suppression of the signal using the arrival time difference of the signal that has reached the
sensor 101 and the sensor 102 from the outside of the terminal device 100.
[0023]
According to the above configuration, it is possible to extract the target signal from the input
signal without providing three or more sensors.
[0024]
Second Embodiment A terminal device 200 as a second embodiment of the present invention will
be described using FIG. 2A.
The rectangular terminal device 200 is a device that emphasizes or suppresses signals from the
sensor 201 and the sensor 202.
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The sensor 201 and the sensor 202 are not limited to an acoustic sensor such as a microphone,
and may be an ultrasonic sensor, a vibration sensor, or the like. That is, although the signals
obtained by these sensors are voice, music, acoustic signals including natural sound, ultrasonic
signals, vibrations and the like, they can be applied to any signal propagating as a plane wave.
[0025]
As shown in FIG. 2A, the terminal device 200 includes a sensor 201, a sensor 202, a signal
processing unit 240 that processes signals received from these sensors, and an output terminal
261 and an output terminal 262. The terminal device 200 further includes a display unit 220 for
displaying image information. The signal processing unit 240 emphasizes or suppresses a
predetermined signal with respect to the signals received from the sensor 201 and the sensor
202 to generate an output signal, and supplies the output signal to the output terminal 261 and
the output terminal 262. Several methods are disclosed in Non-Patent Documents 1 to 3 and
Patent Documents 5 and 6 regarding methods for implementing signal enhancement or
suppression.
[0026]
The technique described in Non-Patent Document 1 generates a target block signal in which a
signal other than the target signal is dominant by attenuating the target signal using the phase
difference of a plurality of input signals. The target block signal is processed by an adaptive filter
to generate a modified target block signal. Also, a target emphasis signal in which the target
signal is emphasized is generated using the phase difference of the plurality of input signals. The
components other than the target signal remaining in the target emphasis signal are further
reduced by subtracting the modified target block signal from the target emphasis signal. The
coefficients of the adaptive filter are updated such that the average power of the output signal
that is the subtraction result is minimized. The subtraction result obtained in this manner is an
output signal in which the target signal is emphasized in comparison with the input signal. The
target emphasis signal may be processed by an adaptive filter to generate a modified target
emphasis signal and subtracted from the target block signal to obtain an output signal in which
the target signal is suppressed.
[0027]
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The technique described in Non-Patent Document 2 is based on a signal with the most delayed
phase as a reference so as to eliminate the phase difference (time difference) of a plurality of
input signals, and then appropriately delay the other signals. Process with an impulse response
length (FIR) filter, and finally obtain the sum and use as an output. The coefficients of the FIR
filter are updated to minimize the mean square error of the output signal. At that time, a
constraint is added that the transfer function for the target signal of the entire FIR filter is a unit
impulse. It is known that the technology described in Non-Patent Document 2 is equivalent to the
technology described in Non-Patent Document 1.
[0028]
The technique described in Non-Patent Document 3 introduces a coefficient value constrained
adaptive filter for target block signal generation and a coefficient norm constrained adaptive
filter for generation of a modified target block signal with respect to the technique described in
Non-Patent Document 1 There is. It is possible to improve the excessive followability to the
fluctuation of the target signal and to reduce the distortion of the output signal.
[0029]
The technique described in Patent Document 5 determines the phase difference of the input
signal for each frequency component, and applies a gain between 0 and 1 based on a preset
phase difference-gain characteristic to enhance or suppress the signal. I do. By setting the value
of the phase difference proportional to the frequency using different phase difference-gain
characteristics for each frequency component, the signal passage angular width with respect to
the spatial direction is made constant regardless of the frequency. The technique described in
Patent Document 5 can achieve sharp spatial signal selectivity with a smaller number of sensors,
as compared to the techniques described in Non-Patent Documents 1 to 3. Also, by appropriately
designing phase difference-gain characteristics, specifically by setting a plurality of pass
direction bands, signals coming from a plurality of different directions are simultaneously passed,
and signals coming from other directions are transmitted. Can be suppressed.
[0030]
The technology described in Patent Document 6 applies the phase difference-gain characteristics
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obtained in the same manner as the technology described in Patent Document 5 to the signals of
all the sensors in common. By applying a common gain, the correlation between a plurality of
input signals present at the input can be maintained, and spatial selectivity can be achieved
without changing the sound source localization for multi-channel signals such as stereo signals. It
can be realized.
[0031]
In the techniques for emphasizing or suppressing signals arriving from spatially different
directions using a plurality of sensors, including the techniques described in Non-Patent
Documents 1 to 3 and Patent Documents 5 and 6, Use phase difference. Therefore, it becomes a
problem whether or not there is a phase difference corresponding to the signal arrival direction
between the signals in the plurality of sensors. This problem depends on how multiple sensors
are attached to the terminal, in what orientation the terminal is held, how the signal sources are
distributed in space, etc.
[0032]
In a typical terminal usage scenario, for example, assuming that the target signal source is the
first speaker, the jamming signal source is the second speaker, and it is assumed that the heights
of both speakers are the same, The mouth, ie the signal source, lies on the same plane O which is
at a height equal to the height from the ground or floor. On the other hand, it is assumed that the
terminal is held so that the major side of the terminal is horizontal. In this embodiment, since the
terminal device 200 is rectangular as shown in FIG. 2B and FIG. 2C, the terminal is held so that
the lower side and the upper side of the terminal are horizontal.
[0033]
The rectangular terminal device 200 includes an outer peripheral portion 210 outside the
display unit 220, as shown in FIGS. 2A, 2B, and 2C. The terminal device 200 includes two sensors
201 and 202. The two sensors 201 and 202 are provided one by one on the outer peripheral
portion 210 constituting two adjacent sides of the vertex A of the terminal device 200.
[0034]
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The sensor 201 and the sensor 202 are arranged at other than the vertex. Therefore, the straight
line connecting the sensor 201 and the sensor 202 forms a non-zero angle with any of the sides
constituting the outer periphery of the device regardless of the positions on the side AB and the
side DA of these sensors. If the terminal device 200 is held so that one of the side AB, the side BC,
the side CD, and the side DA is horizontal, the straight line connecting the sensor 201 and the
sensor 202 forms a nonzero angle with the horizontal plane. . The sensor 201 and the sensor
202 are on two adjacent sides forming the outer periphery of the apparatus, and since the two
adjacent sides are orthogonal to each other, the angle θ formed by the straight line connecting
the sensor 201 and the sensor 202 with the side forming the outer periphery is It is because it
becomes nonzero.
[0035]
By arranging the two sensors obliquely with respect to the side of the terminal, the horizontal
spacing of the sensors becomes nonzero whether the terminal is held horizontally or vertically.
For this reason, assuming that the signals coming from different directions are plane waves, the
signals in the two sensors have an arrival time difference corresponding to the signal arrival
direction. If this time difference is divided by the speed of the signal received by the sensor to
obtain a distance, this distance corresponds to the signal arrival direction. Knowing the signal
arrival direction, accordingly, it is possible to provide directional gain or attenuation according to
the method of Patent Document 5 or 6, and perform selective signal enhancement or signal
attenuation.
[0036]
On the other hand, if two sensors are arranged on the same side, the sensor interval along the
horizontal plane becomes zero when arranged horizontally on the right side or left side when
arranged vertically, when arranged on the upper side or lower side . For this reason, when signals
arriving from different directions along a horizontal plane are captured by two sensors, there is
no difference in arrival time between the two signals. Therefore, the direction of arrival of the
signal can not be estimated, and selective signal enhancement or attenuation based on the
direction of arrival can not be performed.
[0037]
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<When the height of the target signal source and the interference signal source are the same and
in the same horizontal plane O as the side AB> As shown in FIGS. 2B and 2C, the side AB passing
through the apex A and the apex B included in the edge In order to be horizontal, it is assumed
that the terminal device 200 is held and a plurality of signal sources including at least one target
signal and one jamming signal exist in different directions on the same horizontal plane O. That
is, the heights of the plurality of signal sources from the ground or floor are all equal, and they
exist on the same horizontal plane O. Further, as shown in FIG. 2B and FIG. 2C, it is assumed that
the terminal device 200 is held at such a height that the horizontal plane O includes the side AB.
FIG. 2B illustrates an example in which the side BC of the terminal device 200 is vertical
(perpendicular to the horizontal plane O), and in FIG. 2C, the side BC of the terminal device 200
forms an angle smaller than π / 2 with the horizontal plane O. Furthermore, assuming that the
signal source S is sufficiently far from the terminal device 200 with respect to the wavelength of
the signal, the signals S0 and S1 arriving at the sensor 201 and the sensor 202 can be
approximately regarded as plane waves.
[0038]
Assuming that the distance between sensor 201 and sensor 202 (the shortest distance) is d, and
the angle between straight line L connecting sensor 201 and sensor 202 to side AB is θ, the
sensor distance along horizontal plane O including side AB is It becomes d cos θ. As shown in
FIG. 2B, it corresponds to the relative time difference τ between the signal S0 and the signal S1
input to the sensor 201 and the sensor 202 from the signal source S in the direction forming an
angle φ with the side AB on the horizontal plane O including the side AB. The distance τ / c can
be expressed as d cos θ sin φ using the inter-sensor distance d. Here, c is the propagation
velocity of the signal received by the sensor, and in the case of an acoustic signal, the velocity of
sound. That is, d cos θ sin φ = τ / c.
[0039]
If τ is measured, d, θ, and c are known, so the above equation can be solved for φ and the
arrival direction φ of the signal S can be determined. That is, on the horizontal plane O including
the side AB, relative time difference τ (equivalently relative phase difference) between the signal
S0 and the signal S1 inputted to the sensor 201 and the sensor 202 is measured with respect to
the signal coming from the direction φ. By doing this, it is possible to obtain φ and estimate the
signal arrival direction. For example, if the sensor is on the side AB, when the terminal is rotated
03-05-2019
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by π / 2 and held so that the side AB is vertical, the signals from the two sensors have zero time
difference with respect to the signal from all directions along the horizontal plane. become.
Therefore, by estimating the direction based on the time difference between the signals, it is not
possible to emphasize or attenuate the signal according to the direction, which is a problem. If
the two sensors are arranged at an angle, a time difference corresponding to the direction of
arrival occurs to signals coming from all directions on the horizontal plane, in both horizontal
and vertical holding. Although this time difference is zero for a signal coming from the front, it is
different from all directions including the front, so that the direction of arrival of the signal can
be estimated.
[0040]
Therefore, the techniques described in Non-Patent Documents 1 to 3 and Patent Documents 5
and 6 are applied to the signal S input to the sensor 201 and the sensor 202, and different
signals on the horizontal plane O including the side AB Signals coming from directions can be
emphasized or suppressed.
[0041]
<When the heights of the target signal source and the interference signal source are the same as
the side AB but different from the height of the side AB, and are on a plane inclined by δ1
forward of the terminal> Next, as shown in FIG. Consider a case in which a plurality of signal
sources S1 and S2 including one target signal and one interference signal, and a horizontal plane
on which the side AB exists, are in horizontal planes different in height from the ground surface
or the floor surface.
In this case, the plurality of signal sources including at least one target signal and one
interference signal and the side AB can be considered to be in a plane O1 forming an angle δ1
with the horizontal plane O. With respect to the relative time difference τ between the signal S0
and the signal S1 input to the sensor 201 and the sensor 202 on the plane O1, the same equation
as that on the plane O is established, and d cos θ sin φ = τ / c.
[0042]
That is, even on the horizontal plane O1 where the horizontal plane O where the side AB exists is
inclined by δ1, relative time difference τ between the signal S0 and the signal S1 input to the
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sensor 201 and the sensor 202 with respect to the signal coming from the direction φ on O1 By
equivalently measuring the relative phase difference, it is possible to obtain φ and estimate the
signal arrival direction. Therefore, the techniques described in Non-Patent Documents 1 to 3 and
Patent Documents 5 and 6 are applied to the signal S input to the sensor 201 and the sensor 202
and different on the horizontal plane O1 including the side AB. Signals coming from directions
can be emphasized or suppressed.
[0043]
<When the heights of the target signal and the interference signal are different and are on a
plane inclined by δ2 to the left> Next, the plane O2 in which a plurality of signal sources
including at least one target signal and one interference signal exist is Let us consider the case
where the horizontal plane O where the side AB exists is inclined by δ2 to the right. This
corresponds to the case where the heights of the first speaker and the second speaker are
different, and examples thereof include signals from adults and children, humans, and small
robots. In this case, as shown in FIG. 2E, the side AB does not exist on the plane O2 in which the
target signal and the interference signal exist. However, since the relative time difference τ
between the signal S0 and the signal S1 input to the sensor 201 and the sensor 202 occurs on
the plane O2, using the distance d cos (θ + δ2) of the sensor 201 and the sensor 202 along the
plane O2, The same relationship as in the case of the horizontal plane O is established. d cos (θ +
δ 2) sin φ = τ / c
[0044]
Here, what is different from the case of the horizontal plane O is the existence of δ2, and usually
δ2 is unknown. However, if the signal source is sufficiently far from the terminal device 200
with respect to the wavelength of the signal, and the signals S0 and S1 arriving at the sensor 201
and the sensor 202 can be approximately regarded as plane waves, then δ2 is approximate. Can
be regarded as zero. For this reason, also in the case of the plane O2, as in the case of the
horizontal plane O, d cos (θ + δ 2) sin φ2d cos θ sin φ = τ / c. That is, even on the horizontal
plane O2 in which the horizontal plane O where the side AB exists is inclined by .delta.2 to the
left, the signal S0 input to the sensor 201 and the sensor 202 relative to the signal coming from
the direction .PHI. By measuring the time difference τ (and also the relative phase difference
equivalently), it becomes possible to determine φ and estimate the signal arrival direction.
Therefore, the techniques described in Non-Patent Documents 1 to 3 and Patent Documents 5
and 6 are applied to the signal S input to the sensor 201 and the sensor 202 and different on the
horizontal plane O2 including the side AB. Signals coming from directions can be emphasized or
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suppressed.
[0045]
<Combination of the Two Front Examples> Next, with respect to the horizontal plane O, consider
a plane O3 that is inclined δ1 in front of the terminal and δ2 in the right direction. Such a
plane can be considered as a combination of the plane O1 and the plane O2. The distance
between the sensor 201 and the sensor 202 with respect to the signal S coming from the
direction φ on the plane O3 is dcos (θ + δ2), and dcos (θ + δ2) sinφ ≒ dcosθsinφ = τ / c
as in the case of the horizontal plane O2. That is, by measuring the relative time difference τ
(equivalently the relative phase difference) between the signal S0 and the signal S1 input to the
sensor 201 and the sensor 202, it is possible to obtain φ and estimate the signal arrival
direction. . Therefore, the techniques described in Non-Patent Documents 1 to 3 and Patent
Documents 5 and 6 are applied to the signal S input to the sensor 201 and the sensor 202, and
they are different on the horizontal plane O3 including the side AB. Signals coming from
directions can be emphasized or suppressed.
[0046]
Since all planes can be considered as planes inclined by δ2 in the left direction and δ1 in the
forward direction, a plurality of signal sources including at least one target signal and one
interference signal were distributed on any plane Also, by measuring the relative time difference
τ (also the relative phase difference equivalently) between the signal S0 and the signal S1 input
to the sensor 201 and the sensor 202, it is possible to obtain φ and estimate the signal arrival
direction. Become. Therefore, the techniques described in Non-Patent Documents 1 to 3 and
Patent Documents 5 and 6 are applied to the signal S input to the sensor 201 and the sensor 202
to emphasize or suppress signals coming from directions. can do.
[0047]
<The case where the holding state of the terminal is not horizontal but inclined> Next, as shown
in FIG. 2F, a case where the terminal device 200 is held from the horizontal plane O to the left by
α will be considered. At this time, when the sensor 201 and the sensor 202 are projected on the
horizontal plane P, the interval is d cos (θ + α) and becomes zero when α = 0.5π−θ. For this
reason, except when the case of α = 0.5π-θ (that is, when the terminal device 200 is held so
03-05-2019
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that the sensor 201 and the sensor 202 are vertically aligned), when the terminal device 200 is
inclined and held However, by measuring the relative time difference τ (equivalently the relative
phase difference as well) between the signal S0 and the signal S1 input to the sensor 201 and the
sensor 202, it is possible to obtain φ and estimate the signal arrival direction. . Therefore, the
techniques described in Non-Patent Documents 1 to 3 and Patent Documents 5 and 6 are applied
to the signal S input to the sensor 201 and the sensor 202 and different on the horizontal plane
O1 including the side AB. Signals coming from directions can be emphasized or suppressed.
[0048]
When the inclination of the terminal device 200 is α = 0.5π−θ, as described above, the
relative time difference τ between the signal S0 and the signal S1 input to the sensor 201 and
the sensor 202 (equivalent relative phase difference It is impossible to determine φ and estimate
the signal arrival direction by measuring. However, normally, when the user holds the terminal,
the upper side or the lower side of the terminal is kept horizontal, so that α = 0.5π-θ does not
hold. Furthermore, even if it is assumed that the occurrence probability of α is uniform
distribution, the occurrence probability is extremely low. Therefore, the impossibility of
estimating the signal arrival direction only in the case of α = 0.5π−θ does not pose a major
problem.
[0049]
<When the holding state of the terminal is not horizontal but vertical> Next, as shown in FIG. 2G,
the terminal apparatus 200 is in the state of FIG. 2A such that the side AB is vertical and the side
DA is horizontal (upper side). Consider turning 90 degrees to the right from. At this time, the
distance between the sensor 201 and the sensor 202 along the horizontal plane Q including the
side DA or a horizontal plane parallel to the horizontal plane is d sin θ = d cos (0.5π−θ). For
signals coming from the direction forming an angle φ with the side DA on the horizontal plane Q
and the horizontal plane parallel thereto, the distance τ / c corresponding to the relative time
difference τ of the signals input to the sensor 201 and the sensor 202 is It becomes d sin θ sin
φ. That is, the relative time difference between the signals input to sensor 201 and sensor 202
with respect to the signal coming from direction φ on the horizontal plane Q including side DA
or on a horizontal plane parallel to this (equivalently the relative phase difference as well) It
becomes a value corresponding to the arrival direction φ, and can be estimated by d sin θ sin φ
= c. Therefore, by applying the techniques described in Non-Patent Documents 1 to 3 and Patent
Documents 5 and 6 to signals input to sensor 201 and sensor 202, a horizontal plane Q including
side DA or parallel to this is applied. Signals coming from different directions on the plane can be
03-05-2019
16
emphasized or suppressed.
[0050]
<Case where the holding state of the terminal is inclined α to the left from vertical> A case is
considered where the terminal apparatus 200 held vertically (vertically) as in FIG. 2G is inclined
by an angle α as in FIG. 2F. At this time, the distance between the sensor 201 and the sensor
202 along the horizontal plane is dsin (θ + α), and becomes zero when α = −θ. For this
reason, except for the case of α = −θ, even when the terminal device 200 is held in an inclined
state, the relative time difference τ between the signal S0 and the signal S1 input to the sensor
201 and the sensor 202 (equivalently relative position By measuring the phase difference, it is
possible to determine φ and estimate the signal arrival direction. Therefore, the technology
described in Non-Patent Documents 1 to 3 and Patent Documents 5 and 6 is applied to the signal
S input to the sensor 201 and the sensor 202, and the horizontal plane Q including the side DA is
α on the left. Signals coming from different directions on an inclined plane can be enhanced or
suppressed.
[0051]
When the inclination of the terminal device 200 is α = −θ, as described above, the relative time
difference τ (equivalently the relative phase difference) between the signal S0 and the signal S1
input to the sensor 201 and the sensor 202 is By measuring, it is impossible to determine φ and
estimate the signal arrival direction. However, normally, when the user holds the terminal, the
upper part or the lower side of the terminal is kept horizontal, so that α = −θ does not hold.
Furthermore, even if it is assumed that the occurrence probability of α is uniform distribution,
the occurrence probability of the value α = −θ itself is extremely low. Therefore, the
impossibility of estimating the signal arrival direction only when α = −θ does not pose a major
problem.
[0052]
As described above, if the sensor interval is nonzero when the straight line connecting the two
sensors is projected on the plane where the signal source is present, the signals input to the
sensor 201 and the sensor 202 have the signal arrival directions It has relative time difference
(and relative phase difference) τ ≠ 0 according to φ.
03-05-2019
17
[0053]
In the example of FIG. 2B, the sensor interval is d cos θ, and in the example of FIG. 2G, d sin θ =
d cos (0.5π-θ).
As long as the sensor 201 is disposed on the side DA and the sensor 202 is disposed on the side
AB, 0 <θ <0.5π. Also, d is non-zero for the two sensors. That is, among various holding states of
the terminal device 200, the sensor interval on the plane in which the signal source exists has a
non-zero value in most cases. Therefore, applying the techniques described in Non-Patent
Documents 1 to 3 and Patent Documents 5 and 6 to a signal input to sensor 201 and sensor 202,
a specific direction on the horizontal plane where the signal source exists The signal coming from
can be emphasized or suppressed.
[0054]
Similarly, when the terminal device 200 is further rotated 90 degrees to the right from the state
of FIG. 2G so that the side AB becomes horizontal (lower side), and from the state of FIG. The
same arguments as in FIG. 2B and FIG. 2G hold true for the case of being horizontal (bottom
side). That is, the sensor intervals when the side AB is horizontal (lower side) and when the side
DA is horizontal (lower side) are d cos θ and d sin θ = d cos (0.5π-θ), respectively, and in most
cases Takes a non-zero value. Therefore, applying the techniques described in Non-Patent
Documents 1 to 3 and Patent Documents 5 and 6 to a signal input to sensor 201 and sensor 202,
a specific direction on the horizontal plane where the signal source exists The signal coming from
can be emphasized or suppressed.
[0055]
As described above, according to this embodiment, the terminal holding direction is parallel to a
plurality of different terminal holding directions (four states in which one of the side AB and the
side DA is horizontal as the upper side or the lower side). A signal coming from a particular
direction on a flat plane (a plane containing either side AB or side DA) can be selectively
enhanced or suppressed using two sensors.
[0056]
To summarize the above description, according to this embodiment, signals arriving from various
directions can be selectively emphasized or suppressed using two sensors with respect to
03-05-2019
18
different terminal holding states.
[0057]
As mentioned above, although the sensor 201 and the sensor 202 which were arrange |
positioned in the position which pinched | interposed the vertex A of the terminal device 200
were demonstrated, there is no distinction in the vertex of the terminal device 200, These
sensors are any of vertex B, C, D It goes without saying that it may be disposed at a position
sandwiching.
[0058]
With such a configuration and the arrangement of sensors, the terminal device 200 can
selectively emphasize or suppress signals coming from various directions outside the device with
respect to a plurality of different terminal holding directions.
[0059]
Note that, as shown in FIG. 2H, even when the shape of the outer peripheral portion 275 of the
terminal device 270 is a pentagon, the straight line connecting the sensors is not parallel to any
side of the device in any side of the outer peripheral portion 275 Thus, if the two sensors 271
and 272 are provided, the same effect as described above can be obtained.
[0060]
Further, as shown in FIG. 2I, even when the shape of the outer peripheral portion 285 of the
terminal device 280 is hexagonal, the straight line connecting the sensors is not parallel to any
one side of the device in any side of the outer peripheral portion 285 Thus, if two sensors 281
and 282 are provided, the same effect as described above can be obtained.
[0061]
Furthermore, the sensor arrangement of the present embodiment can be similarly applied to the
case where the outer peripheral portion of the terminal device is a heptagon or more, and the
same effect can be obtained.
[0062]
Third Embodiment A terminal device 300 according to a third embodiment of the present
03-05-2019
19
invention will be described with reference to FIG.
Since the terminal device 300 is the same as the first embodiment except for the installation
position of the sensor, the description of the details of the operation will be omitted, and only
differences caused by different sensor positions will be described.
[0063]
The terminal device 300 includes a display unit 320 which is rectangular and smaller than the
outer peripheral unit 310 as shown in FIG.
The terminal device 300 equips the sensors 301 and 302 one by one with the outer peripheral
part 310 which comprises two sides AB and side DC which oppose.
The straight line L connecting the sensor 301 and the sensor 302 is not parallel to any side AB,
BC, CD, DA of the device.
That is, the angle θ between the straight line L and the side AB always has a value other than
0.5π.
[0064]
Therefore, the straight line connecting the sensors 301 and 302 forms a non-zero angle with any
of the sides constituting the outer periphery of the device regardless of the positions on the side
CD and the side BA of these sensors.
If the terminal device 300 is held such that one of the side AB, the side BC, the side CD, and the
side DA is horizontal, the straight line L connecting the sensor 301 and the sensor 302 is a
horizontal plane or a non-zero plane. Make an angle of
[0065]
03-05-2019
20
When the terminal device 300 holds the side AB including the vertices A and B so as to be
horizontal, and the distance between the sensor 301 and the sensor 302 (the shortest distance) is
d, the sensor distance along the horizontal surface is dcosθ.
Is the angle between the straight line L connecting the sensor 301 and the sensor 302 and the
side AB.
Similar to FIG. 2B, for signals S0 and S1 coming from the direction on the horizontal plane
forming an angle φ with the side AB, the relative time difference τ of the signals input to the
sensor 301 and the sensor 302 is cd cos θ sin φ. That is, for signals coming from a specific
direction on a plane including side AB and parallel to the ground plane or horizontal plane, the
relative time difference between the signals input to sensor 301 and sensor 302 is (equivalent
The relative phase difference also has a value corresponding to the arrival direction φ.
Therefore, by applying the techniques described in Non-Patent Documents 1 to 3 and Patent
Documents 6 and 7 to signals input to sensor 301 and sensor 302, on a plane parallel to the
ground plane or horizontal plane including side AB Signals coming from different directions of
can be emphasized or suppressed.
[0066]
Similarly to FIG. 2F, when the terminal device 300 is held with an α inclination to the left, the
horizontal distance between the sensors 301 and 302 is d cos (θ + α). Therefore, except for the
case of α = 0.5π−θ, the above effect is achieved even when the terminal device 300 is held in
an inclined state.
[0067]
When the terminal device 300 is held vertically so that the side AB is vertical and the side DA is
horizontal (upper side), the horizontal distance between the sensors 301 and 302 is dsin θ = d
cos (0.5π-θ). The relative time difference τ between the signals input to the sensors 301 and
302 is cdsin θ sin φ for signals coming from the direction on the horizontal plane forming an
angle φ with the side DA. Furthermore, also in the case where the terminal device 300 is held at
an α inclination to the left from that state, the horizontal distance between the sensors 301 and
03-05-2019
21
302 is dsin (θ + α), and becomes zero when α = −θ. For this reason, the above effect is
achieved except in the case of α = −θ.
[0068]
Therefore, as in the second embodiment, the ground plane including the side DA is applied to the
signals input to the sensors 301 and 302 by applying the techniques described in Non-Patent
Documents 1 to 3 and Patent Documents 6 and 7, and the like. Or signals coming from different
directions on a plane parallel to the horizontal plane can be enhanced or suppressed.
[0069]
Similarly, the same argument holds for the case where the terminal device 300 is held so that the
side AB is horizontal (lower side) and the case where the side DA is held horizontal (lower side).
That is, the sensor intervals when the side AB is horizontal (bottom side) and when the side DA is
horizontal (bottom side) are d cos θ and d sin θ = d cos (0.5π-θ), respectively, and θ = 0.5π.
All have non-zero values except in the case. Therefore, the signals input to the sensors 301 and
302 are applied from the specific direction on the horizontal plane where the signal source exists
by applying the techniques described in Non-Patent Documents 1 to 3 and Patent Documents 6
and 7, etc. The signal can be emphasized or suppressed.
[0070]
When a signal source exists on the plane O1 described using FIG. 2D, the distance on the plane
O1 of the sensor 301 and the sensor 302 is d cos θ. Therefore, except in the case of θ = 0.5π,
the signal obtained from the sensor 301 or the sensor 302 has a nonzero phase difference (time
difference), and the signal coming from the direction φ on the plane O1 is The techniques
described in U.S. Pat.
[0071]
When a signal source exists on the plane O2 described with reference to FIG. 2E, the distance
between the sensors 301 and 302 on the plane O2 is d cos (θ + δ 2). Also, as described using
03-05-2019
22
FIG. 2E, it can be considered that δ 2 = 0. Therefore, except in the case of θ = 0.5π, the signal
obtained from the sensor 301 or the sensor 302 has a non-zero phase difference (time
difference), and the signal coming from the direction φ on the plane O2 is The techniques
described in U.S. Pat.
[0072]
As can be seen from the examples of these two types of planes O1 and O2, signals coming from a
specific direction on a plane not parallel to the terminal holding direction are also described in
Non-Patent Documents 1 to 3 and Patent Documents 6 and 7. Technology can be applied to
emphasize or suppress.
[0073]
With such a configuration and the arrangement of sensors, the terminal device 300 can
selectively emphasize or suppress signals coming from various directions outside the device with
respect to a plurality of different terminal holding directions.
[0074]
In the above, the case where the sensor 301 is disposed on the side AB and the sensor 302 is
disposed on the side CD has been described as an example, but exactly the same explanation is
described that one sensor is disposed on each of the side DA and the side BC The same is true for
the case.
[0075]
Fourth Embodiment A terminal device 400 according to a fourth embodiment of the present
invention will be described with reference to FIG.
The terminal device 400 is the same as the second embodiment except for the installation
position of the sensor, so the description of the configuration and operation will be omitted, and
only differences caused by different sensor positions will be described.
[0076]
03-05-2019
23
The terminal device 400 includes a display unit 420 smaller than the rectangular outer
peripheral portion 410.
The terminal device 400 is provided with one sensor 401 and one sensor 402 respectively at the
outer peripheral portion 410 forming the diagonal, that is, at two non-adjacent vertices B and D.
Instead of these sensors, one sensor may be provided at each of the vertex A and the vertex C.
[0077]
When the terminal device 400 is held so that the side AB is horizontal and upper side, and the
distance (shortest distance) between the sensors 401 and 402 is d, the sensor distance along the
horizontal plane is dcosθ. Therefore, by applying the techniques described in Non-Patent
Documents 1 to 3 and Patent Documents 6 and 7 to the signals input to the sensors 401 and
402, the signals can be emphasized or suppressed. In addition, the same applies to various cases
shown in FIGS. 2C to 2G, such as when the terminal device 400 is held at an angle, or when the
signal source exists at an angle with the horizontal plane O including the side AB. By applying the
techniques described in Non-Patent Documents 1 to 3 and Patent Documents 6 and 7 to signals
input to the sensors 401 and 402, the signals can be emphasized or suppressed.
[0078]
According to this embodiment, with such an arrangement of sensors, the terminal device
selectively emphasizes or suppresses signals coming from various directions outside the device
with respect to a plurality of different terminal holding directions. be able to.
[0079]
Fifth Embodiment A terminal device 500 as a fifth embodiment of the present invention will be
described with reference to FIG.
The terminal device 500 is the same as the second embodiment except for the installation
position of the sensor, so the same reference numerals are given to the same configuration, and
the description thereof is omitted, and only differences caused by different sensor positions are
03-05-2019
24
described. Do.
[0080]
The terminal device 500 equips two sensors 501 and 502 in the outer peripheral part 510 which
comprises 1 side AB. Although the sensor 501 and the sensor 502 are both in the side AB, the
straight line L connecting the sensor 501 and the sensor 502 is not parallel to any side AB, BC,
CD, DA of the device.
[0081]
Also in this embodiment, as in the second embodiment, the relative time difference between the
signals input to the sensors 501 and 502 (equivalently, the relative phase difference) is a value
corresponding to the direction of arrival. Therefore, applying the techniques described in NonPatent Documents 1 to 3 and Patent Documents 5 and 6 to signals input to the sensors 501 and
502 to enhance or suppress signals coming from the outside of the device. Can.
[0082]
It is needless to say that the two sensors 501 and 502 are not limited to be arranged on the side
AB, and the same effect can be obtained regardless of which side of the side BC, the side CD, and
the side DA.
[0083]
That is, according to the present embodiment, with such an arrangement of sensors, the terminal
device 500 selectively emphasizes signals arriving from various directions outside the device
with two sensors with respect to a plurality of different terminal holding directions. Or can be
suppressed.
[0084]
Note that, as shown in FIG. 6, even when the shape of the outer peripheral portion 610 of the
terminal device 600 is a pentagon, the straight line connecting the sensors is not parallel to any
of the sides of the device in any side of the outer peripheral portion 610. As described above, if
two sensors 601 and 602 are provided, the same effect as described above can be obtained.
03-05-2019
25
[0085]
Further, as shown in FIG. 7, even when the shape of the outer peripheral portion 710 of the
terminal device 700 is hexagonal, the straight line connecting the sensors is not parallel to any
side of the device in any side of the outer peripheral portion 710 Thus, if the two sensors 701
and 702 are provided, the same effect as described above can be obtained.
[0086]
Furthermore, the sensor arrangement of the present embodiment can be similarly applied to the
case where the outer peripheral portion of the terminal device is a heptagon or more, and the
same effect can be obtained.
[0087]
Sixth Embodiment A terminal apparatus 800 according to a sixth embodiment of the present
invention will be described with reference to FIG.
The terminal device 800 is different from the second embodiment in that a correction unit 801
and an input terminal 820 are provided.
The other configurations and operations are similar to those of the second embodiment, and
therefore the same configurations and operations are denoted by the same reference numerals
and the detailed description thereof is omitted.
[0088]
<Operation of Correction Unit> The correction unit 801 generates a delay input signal by giving
different delays to the signals received from the sensor 201 and the sensor 202 using the delay
information received from the input terminal 820.
Furthermore, the delay input signal is transmitted to the signal processing unit 240.
03-05-2019
26
The signal received from sensor 201 and the delay applied to the signal received from sensor
202 shift the directivity generated in signal processing unit 240 to the right or left by an amount
corresponding to the given delay. .
Such directional shift is called beam steering. By processing the beam-steered signal in the
correction unit 801 in the signal processing unit 240, more accurate signal enhancement or
attenuation can be performed. The reason will be described with reference to FIG.
[0089]
<Reason why the correction unit 801 is required> FIG. 9 is a top view of the terminal device 800
provided with the sensor 201 and the sensor 202 on the side AB as in FIG. 2B. Usually, the
terminal device 800 is used under the assumption that the target signal arrives from the
direction perpendicular to the display surface. When the user holds the terminal device 800 so as
to satisfy this condition, a target signal comes to exist in front of the midpoint U0 with respect to
the side AB of the terminal device 800. That is, a straight line U0U1 connecting the position U1
of the target sound source and the midpoint U0 intersects the side AB at a right angle. However,
since the midpoint U2 of the line segment obtained by projecting the straight line L connecting
the sensor 201 and the sensor 202 on the side AB does not match the midpoint U0 of the side
AB, the straight line U1U2 connecting the midpoint U2 and the position U1 of the target sound
source is , Not perpendicular to the side AB.
[0090]
Assuming that the angle formed by the side AB with the straight line U1U2 is Δ, the direction
perpendicular to the side AB and corresponding to the front of the terminal apparatus 800 (the
surface with the display unit) is 0, the signal arrival of the target signal source in front of the
terminal apparatus 800 The direction is -Δ. In order to correct this, the correction unit 801
steers the signals received from the sensor 201 and the sensor 202 by + Δ. The signal coming
from the Δ direction arrives first at the sensor 201 and arrives later at the sensor 202. The
correction unit 801 delays the signal arriving at the sensor 201 with the signal arriving at the
sensor 202 as it is, and outputs the delayed signal so that delayed input signals transmitted to
the signal processing unit 240 arrive at the sensor 201 and sensor 202 simultaneously. To be
equal to the A delay time or an equivalent phase difference necessary for this is supplied to the
input terminal 820.
03-05-2019
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[0091]
Further, instead of the delay time, information regarding the size of the terminal device 800 and
the arrangement of the sensor 201 and the sensor 202 can be supplied to the input terminal
820, and the delay time can be determined by the correction unit 801.
[0092]
<Calculation of Delay Time in Correction Unit 801> Assuming that the length of line segment
U0U2 is d02 and the length of line segment U0U1 is d01, the distance d03 corresponding to the
delay time to be added by correction unit 801 from the extraction diagram of FIG. Is d03 = d02
sin Δ, and the delay time τ03 is given by τ03 = (d02 sin Δ) / c.
[0093]
<Estimation of Angle Δ> The length d02 of the line segment U0U2 can be obtained if the details
of the terminal device 200 are specified.
Further, Δ corresponding to the direction of arrival (DOA) can be estimated using the signals
arriving at the sensor 201 and the sensor 202.
Various methods are known as estimation methods of signal arrival direction, and methods using
phase differences of signals arriving to multiple sensors (for example, cross correlation method,
mutual spectrum power analysis method, GCC-PHAT, etc.), MUSIC method Non-patent document
4 discloses a representative subspace method. The angle Δ may be estimated by another device
and supplied to the input terminal 820 along with the length d02 of the line segment U0U2.
[0094]
<Approximation Calculation of Angle Δ> The angle Δ formed by the side AB with the straight
line U1U2 can also be determined by an approximation calculation as follows. Since sin Δ is sin
<2> Δ + con <2> Δ = 1, it is given by the following, and the delay time is finally τ 03. Among
these, the length d02 of the line segment U0U2 can be obtained if the details of the terminal
device 200 are specified. Although the length d01 of the line segment U0U1 is unknown, if the
approximate position of the target signal source is known, an approximate value can be obtained
03-05-2019
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and used. For example, when the user's voice is taken as a target signal when the terminal device
200 is held and used with both hands, it is possible to set d01 = 0.5 m. That is, the length d01 of
the line segment U0U1 and the length d02 of the line segment U0U2 are supplied to the input
terminal 820.
[0095]
Beam steering is realized by adding τ 03 obtained in this manner or its approximate value to a
signal that has arrived at the sensor 201 earlier to be a delayed input signal. Which signal of the
sensor 201 and the sensor 202 is to be delayed depends on which signal is leading in phase.
That is, since a negative delay can not be added, the signal to be delayed is always one of the
signals of the sensor 201 and the sensor 202 which is in advance in phase.
[0096]
<Simultaneous Correction of Amplitude and Delay in Correction Unit 801> Although the method
of realizing beam steering by delaying the signal of one of the sensors 201 and 202 has been
described above, the correction unit 801 adds a delay. At the same time, amplitude correction
may be performed. Among the signals of the sensor 201 and the sensor 202, the signal with the
later arrival time is more strongly attenuated. This is because the distance between the signal
source and the sensor is long. In order to correct this, attenuation is also added to the signal to
which the delay is added. The amount of attenuation is determined by the delay time τ03 or the
corresponding distance d03, the medium surrounding the terminal device 200, and the
frequency band of the signal arriving at the sensor 201 and the sensor 202, and can be known in
advance. By adding attenuation simultaneously with the addition of delay and correcting both the
phase and the amplitude, more accurate beam steering can be performed and the enhancement
or suppression performance of the target signal can be improved.
[0097]
Seventh Embodiment A terminal device 1100 according to a seventh embodiment of the present
invention will be described with reference to FIG. The terminal device 1100 is the same as the
second embodiment except for the installation position of the sensor, so the description of the
details of the operation will be omitted, and only differences caused by different sensor positions
will be described. The terminal device 1100 is different from the fifth embodiment (FIG. 6) in the
03-05-2019
29
installation position of the sensor. The other configurations and operations are the same as those
of the fifth embodiment, and therefore, the same configurations and operations are denoted by
the same reference numerals and the detailed description thereof will be omitted.
[0098]
The regular pentagonal terminal device 1100 includes a display unit 1120 that is smaller than
the outer peripheral portion 1110. The outer peripheral portion 1110 mounts the sensors 1101
and 1102 at any two adjacent vertices.
[0099]
When the side CD of the terminal device 1100 is held horizontally and on the lower side, and the
distance between the sensor 1101 and the sensor 1102 (the shortest distance) is d, the
horizontal distance of the sensor is d cos (0.2π). Here, 0.2π is an angle between the side CD and
a straight line L connecting the sensors 1101 and 1102. The relative time difference τ between
the signals input to the sensor 1101 and the sensor 1102 is cdcos (0.2π) sin φ for signals
coming from the direction forming an angle φ with the side CD on the horizontal plane including
the side CD. That is, for signals coming from any position on the plane including side CD, the
relative time difference between the signals input to sensor 1101 and sensor 1102 (equivalently
the relative phase difference) is in the direction of arrival φ It becomes a corresponding value.
Therefore, applying the techniques described in Non-Patent Documents 1 to 3 and Patent
Documents 5 and 6 to a signal input to sensor 1101 and sensor 1102, parallel to the ground
plane or horizontal plane including side CD Signals coming from different directions on the plane
can be emphasized or suppressed.
[0100]
In the case where the terminal device 1100 is held with an α inclination from the horizontal
surface to the left, the distance between the sensor 1101 and the sensor 1102 along the
horizontal surface is d cos (0.2π + α). Therefore, except in the case of α = 0.3π, the abovedescribed effect is achieved even when the terminal device 1100 is held at an angle. Next, as
shown in FIG. 12, it is considered that the terminal device 1100 is rotated by 0.4π to the right
from the state of FIG. 11 so that the side BC becomes horizontal (lower side). At this time, the
horizontal distance between the sensor 1101 and the sensor 1102 is dsin (0.1π) = dcos (0.4π).
03-05-2019
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The relative time difference τ between the signals input to the sensor 1101 and the sensor
1102 is cdsin (0.1π) sin φ for signals coming from the direction on the horizontal plane
forming an angle φ with the side BC. Therefore, as in the second embodiment, the techniques
described in Non-Patent Documents 1 to 3 and Patent Documents 5 and 6 are applied to the
signals input to the sensor 1101 and the sensor 1102 to apply the side CD. It is possible to
emphasize or suppress signals coming from different directions on a plane parallel to the
included ground plane or horizontal plane.
[0101]
Next, as in FIG. 2F, consider the case where the terminal device 1100 is held with an inclination
of α from the state of FIG. 12 to the left. At this time, the distance between the sensor 1101 and
the sensor 1102 along the horizontal plane is dsin (0.1π + α), and becomes zero when α =
−0.1π. Therefore, except for the case of α = −0.1π, the incoming signal can be emphasized or
suppressed even when the terminal device 1100 is held with an α inclination to the left.
[0102]
Similarly, in the case where the terminal apparatus 1100 is rotated by 0.4π further to the right
from the state of FIG. 12 so that the side AB becomes horizontal (bottom side), the terminal EA is
rotated by 0.8π and the side EA becomes horizontal (bottom side) In this case, when the side DC
becomes horizontal (bottom side) by rotating 0.4π to the left from the state of FIG. 12 and when
the side ED becomes horizontal (bottom side) by 0.8π. The same arguments as in FIGS. 11 and
12 hold for the case of FIG. That is, when the side AB is horizontal (bottom side), when the side
EA is horizontal (bottom side), when the side DC is horizontal (bottom side), and when the side
ED is horizontal (bottom side), the sensor intervals are respectively , D, sin 0.1π, dcos 0.2π, and
dcos 0.2π, all having non-zero values. Therefore, applying the techniques described in NonPatent Documents 1 to 3 and Patent Documents 5 and 6 to a signal input to sensor 1101 and
sensor 1102, a specific direction on a horizontal plane where a signal source exists The signal
coming from can be emphasized or suppressed.
[0103]
As described above, according to the present embodiment, with respect to a plurality of different
terminal holding directions (five states in which any one of the side CD, the side BC, the side AB,
the side EA, and the side DE is horizontal as the lower side) The signal coming from a specific
direction on a plane parallel to the terminal holding direction (a plane including any of side CD,
03-05-2019
31
side BC, side AB, side EA, side DE) is selectively selected using two sensors. It can be emphasized
or suppressed.
[0104]
Next, as in FIG. 2D of the second embodiment, consider a plane O1 rotated downward by an
angle δ1 with respect to the plane O about the side CD.
The distance between the sensor 1101 and the sensor 1102 on the plane O1 is d cos (0.2π).
Therefore, the signals obtained from the sensor 1101 or the sensor 1102 have non-zero phase
differences (time differences), and the signals coming from the direction φ on the plane O1 are
described in Non-Patent Documents 1 to 3 and Patent Documents 5 and 6 The techniques
described can be applied to emphasize or suppress.
[0105]
Next, as in FIG. 2E of the second embodiment, when the horizontal plane O including the side CD
and the plane O2 form an angle δ2, that is, when the horizontal plane O2 is inclined to the left
with respect to the horizontal plane O, the sensor 1101 and The spacing on the plane O2 of the
sensor 1102 is d cos (0.2π + δ 2). Therefore, except in the case of δ = 0.3π, the signal
obtained from the sensor 1101 or the sensor 1102 has a nonzero phase difference (time
difference), and the signal coming from the direction φ on the plane O2 is The techniques
described in U.S. Pat.
[0106]
As can be seen from the examples of these two types of planes O1 and O2, signals arriving from
a specific direction on a plane not parallel to the terminal holding direction are also disclosed in
Non-Patent Documents 1 to 3 and Patent Documents 5 and 6 The techniques described can be
applied to emphasize or suppress.
[0107]
Summarizing the above description, according to the present embodiment, identification is made
with respect to a plurality of different terminal holding directions (a state in which one of side
CD, side BC, side AB, side EA, side DE is horizontal). A signal coming from a specific direction on
03-05-2019
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the plane of (a plane parallel to the terminal holding direction) and a plane not parallel to the
terminal holding direction can be selectively emphasized or suppressed using two sensors.
[0108]
As described above, the case where the sensor 1101 is disposed at the vertex A and the sensor
1102 is disposed at the vertex B has been described as an example, but the same effect can be
obtained when one sensor is disposed at each of the vertex B and the vertex C only. .
The same effect is obtained when one sensor is disposed at each of the vertex C and the vertex D
only.
The same effect can be obtained when one sensor is disposed at each of only the vertex D and
the vertex E. The same effect can be obtained when one sensor is disposed at each of only the
vertex E and the vertex A.
[0109]
With such a configuration and the arrangement of sensors, the terminal device 1100 selectively
emphasizes or suppresses signals coming from a specific direction on a specific plane with
respect to a plurality of different terminal holding directions with two sensors. Can.
[0110]
8TH EMBODIMENT The terminal device 1300 as 8th Embodiment of this invention is
demonstrated using FIG. 13 and FIG.
The terminal device 1300 differs from the fifth embodiment (FIG. 7) in the installation position of
the sensor. The other configurations and operations are the same as those of the fifth
embodiment, and therefore, the same configurations and operations are denoted by the same
reference numerals and the detailed description thereof will be omitted.
[0111]
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The terminal device 1300 includes a regular hexagonal outer peripheral portion 1310 and a
display portion 1320 smaller than that, as shown in FIGS. 13 and 14. The terminal device 1300
mounts the sensors 1301 and 1302 at any two adjacent apexes of the outer peripheral portion
1310.
[0112]
When the terminal device 1300 is held so that the side AB is horizontal and upper side, and the
distance between the sensor 1301 and the sensor 1302 (the shortest distance) is d, the
horizontal distance of the sensor is also d. For signals coming from the direction on the
horizontal plane forming an angle φ with the side AB, the relative time difference τ between the
signals input to the sensor 1301 and the sensor 1302 is cdsin φ. That is, for signals coming
from a specific direction on the horizontal plane including side AB, the relative time difference
between the signals input to sensor 1301 and sensor 1302 (equivalently also relative phase
difference) corresponds to direction of arrival φ It becomes a value. Therefore, applying the
techniques described in Non-Patent Documents 1 to 3 and Patent Documents 5 and 6 to signals
input to sensor 1301 and sensor 1302, from different directions on the horizontal plane
including side AB The incoming signal can be emphasized or suppressed.
[0113]
In the case where the terminal device 1300 is held at an α inclination from the horizontal
surface to the left, the distance between the sensor 1301 and the sensor 1302 along the
horizontal surface is d cos α. Therefore, except for the case of α = 0.5π, the above effect is
achieved even when the terminal device 1300 is held in an inclined state.
[0114]
Next, as shown in FIG. 14, it is considered that the terminal device 1300 is rotated by π / 3 to
the right from the state of FIG. 13 so that the side FA becomes horizontal and upper side. At this
time, the distance along the horizontal surface of the sensor 1301 and the sensor 1302 is d sin
(π / 6) = d cos (π / 3). For signals coming from a direction on the horizontal plane that makes
an angle φ with the side FA, the relative time difference τ of the signals input to the sensor
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1301 and the sensor 1302 is cdsin (π / 6) sinφ. Therefore, the techniques described in NonPatent Documents 1 to 3 and Patent Documents 5 and 6 are applied to the signals input to
sensor 1301 and sensor 1302, and from different directions on the plane including side FA The
incoming signal can be emphasized or suppressed.
[0115]
When the terminal device 1300 is held at an α inclination leftward from the horizontal surface,
the horizontal distance between the sensor 1301 and the sensor 1302 is dsin (π / 6 + α), and
becomes zero when α = −π / 6. For this reason, except for the case of α = −π / 6, even when
the terminal device 1300 is held with an α inclination to the left, an incoming signal can be
selectively emphasized or suppressed by two sensors.
[0116]
Similarly, when the terminal apparatus 1300 is further rotated to the right by π / 3 from the
state of FIG. 14 so that the side EF becomes horizontal and upper side, so that the side DE
becomes horizontal and upper side by 2π / 3. In the case where the side EF is horizontal and
lower side by rotating π / 3 to the left from the state of FIG. 13 and the side FA is horizontal and
lower side by 2π / 3 rotation. The above-described effects can be achieved. That is, when the
side EF is horizontal and upper side, when the side DE is horizontal and upper side, and when the
side EF is horizontal and lower side, the sensor interval when the side FA is horizontal and lower
side is d cos (π). / 3), d, d sin (π / 6), and d cos (π / 3), all having non-zero values. Therefore,
applying the techniques described in Non-Patent Documents 1 to 3 and Patent Documents 5 and
6 to a signal input to sensor 1301 and sensor 1302, a specific direction on the horizontal plane
where the signal source exists The signal coming from can be emphasized or suppressed.
[0117]
Next, as in FIG. 2D, consider a plane O1 in which the plane O is rotated downward by an angle
δ1 with the side AB as an axis. The distance between the sensor 1301 and the sensor 1302 on
the plane O1 is d cos δ1. Therefore, except in the case of δ = 0.5π, the signal obtained from
the sensor 1301 or 1302 has a non-zero phase difference (time difference), and the signal
coming from the direction φ on the plane O1 is The techniques described in U.S. Pat. Next, as in
FIG. 2E of the second embodiment, the sensor 1301 includes the side AB, and the horizontal
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35
plane O and the plane O2 form an angle δ2, that is, the plane O2 is inclined δ2 to the left with
respect to the horizontal plane O. And the space | interval on the plane O2 of the sensor 1302
becomes dcos (delta) 2. Therefore, except in the case of δ2 = 0.5π, the signal obtained from the
sensor 1301 or 1302 has a non-zero phase difference (time difference), and the signal coming
from the direction φ on the plane O2 is The techniques described in U.S. Pat.
[0118]
As can be seen from the examples of these two types of planes, O1 and O2, signals arriving from
a specific direction on a plane not parallel to the terminal holding direction are also non-patent
documents 1 to 3, patent documents 5 and 6 The techniques described in the above can be
applied to emphasize or suppress.
[0119]
Summarizing the above description, according to the present embodiment, identification is made
with respect to a plurality of different terminal holding directions (a state in which one of side
AB, side BC, side CD, side DE, and side EF is horizontal). A signal coming from a specific direction
on the plane of (a plane parallel to the terminal holding direction) and a plane not parallel to the
terminal holding direction can be selectively emphasized or suppressed using two sensors.
[0120]
With such a configuration and the arrangement of sensors, the terminal device 1300 selectively
emphasizes or suppresses signals coming from a specific direction on a specific plane with
respect to a plurality of different terminal holding directions with two sensors. Can.
[0121]
Other Embodiments Although the present invention has been described with reference to the
embodiments, the present invention is not limited to the above embodiments.
The configurations and details of the present invention can be modified in various ways that can
be understood by those skilled in the art within the scope of the present invention.
Also included within the scope of the present invention are systems or devices that combine the
different features included in each embodiment.
03-05-2019
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[0122]
Furthermore, the present invention may be applied to a system configured of a plurality of
devices or to a single device.
Furthermore, the present invention is also applicable to the case where a signal processing
program for realizing the functions of the embodiments is supplied to a system or apparatus
directly or remotely. Therefore, in order to realize the functions of the present invention on a
computer, a program installed on the computer, a medium storing the program, and a WWW
(World Wide Web) server for downloading the program are also included in the scope of the
present invention. .
[0123]
[Other Expressions of Embodiment] Some or all of the above-described embodiments can be
described as in the following appendices, but is not limited thereto. (Supplementary Note 1) A
terminal device provided with only two of a first sensor and a second sensor in an outer
peripheral portion as signal input means, wherein a straight line connecting the first sensor and
the second sensor is the terminal device A terminal provided with signal processing means for
emphasizing or suppressing the signal using the difference in arrival time of the signals arriving
at the first sensor and the second sensor from outside the terminal device, not parallel to any of
the outer peripheries of apparatus. (Supplementary Note 2) The terminal device according to
Supplementary Note 1, wherein the first and second sensors are disposed one by one on an outer
peripheral portion forming two sides sandwiching one corner of the terminal device.
(Supplementary Note 3) The terminal device according to Supplementary Note 1, wherein the
first and second sensors are disposed one by one on an outer peripheral portion constituting two
opposing sides of the terminal device. (Supplementary Note 4) The terminal device according to
Supplementary Note 1, wherein the first and second sensors are disposed one by one on an outer
peripheral portion forming a diagonal of the terminal device. (Supplementary Note 5) The
terminal device according to Supplementary Note 1, wherein both of the first and second sensors
are disposed in an outer peripheral portion constituting one side of the terminal device.
(Supplementary Note 6) The terminal device according to any one of supplementary notes 1 to 5,
wherein an outer periphery of the terminal device has four or more corners. (Supplementary
Note 7) The terminal device according to any one of supplementary notes 1 to 6, wherein the
terminal device has a rectangular flat plate shape provided with a display screen. (Supplementary
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Note 8) The terminal device according to any one of supplementary notes 1 to 7, further
comprising a correction unit that gives different delays to signals received from the first and
second sensors using delay information. (Supplementary Note 9) A control method of a terminal
device including only two of a first sensor and a second sensor as signal input means, wherein a
straight line connecting the first sensor and the second sensor is the terminal device. A control
method for a terminal apparatus, which emphasizes or suppresses the signal using a difference in
arrival time of signals arriving at the first sensor and the second sensor from outside the terminal
apparatus, not parallel to any of the outer peripheries of the terminals. (Supplementary Note 10)
A control program of a terminal device including only a first sensor and a second sensor in an
outer peripheral portion as signal input means, wherein a straight line connecting the first sensor
and the second sensor is The terminal device is a step of emphasizing or suppressing the signal
using the difference in arrival time of the signals arriving at the first sensor and the second
sensor from outside the terminal device, not parallel to any outer periphery of the terminal
device Control program to be executed.
(Supplementary note 11) A terminal device in which the outer periphery is formed in a polygon
having a pentagon or more, and as the signal input means, only two of the first sensor and the
second sensor are provided at adjacent corners of the outer periphery, A terminal device
comprising signal processing means for emphasizing or suppressing the signal using an arrival
time difference of signals arriving at the first sensor and the second sensor from the outside of
the terminal device. (Supplementary note 12) A control method of a terminal device in which the
outer periphery is formed in a polygon having a pentagon or more shape, and as the signal input
means, only two of the first sensor and the second sensor at adjacent corners of the outer
periphery. A control method of a terminal apparatus, comprising: a signal processing step of
emphasizing or suppressing the signal by using an arrival time difference of signals arriving at
the first sensor and the second sensor from the outside of the terminal apparatus.
(Supplementary note 13) A control program of a terminal device in which the outer periphery is
formed in a polygon having five or more sides, and as the signal input means, only two of the
first sensor and the second sensor at adjacent corners of the outer periphery. A control program
of a terminal device, comprising: a signal processing step of emphasizing or suppressing the
signal by using an arrival time difference of signals arriving at the first sensor and the second
sensor from outside the terminal device.
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