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DESCRIPTION JP2011199697

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DESCRIPTION JP2011199697
An object of the present invention is to realize a headphone which can emit an external sound
picked up by a microphone from an integrally mounted speaker in a sound emission mode
according to the situation. A headphone (1) includes a right earpiece casing (10R), a left earpiece
casing (10L), and a main body (20). The right earpiece housing 10R and the left earpiece housing
10L are provided with an external sound collection microphone, a headphone speaker, and a
noise cancellation microphone. The main body unit 20 includes directional sound collecting
signal generation units 30R and 30L, an analysis unit 40, and a sound generation signal
generation unit 50. The individual direction collected sound signals generated by the directivitytyped sound collection signal generation units 30R and 30L are output to the analysis unit 40
and the sound generation signal generation unit 50. The analysis unit 40 generates sound
emission control information according to the situation based on the individual direction sound
collection signal. The sound generation signal generation unit 50 generates a sound generation
signal from the individual direction sound collection signal based on the sound emission control
information. [Selected figure] Figure 1
ヘッドフォン
[0001]
The present invention relates to a headphone having a sound collecting function and emitting
sound in various manners.
[0002]
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1
Conventionally, various headphones having a sound collecting function have been devised.
For example, the headphone described in Patent Document 1 includes a pair of a speaker and a
microphone, and the microphone is disposed movably with respect to the speaker. In the
embodiment in which the microphone, the speaker, and the ear are arranged in order, it
functions as a microphone for collecting external sound, and in the embodiment in which the
speaker, the microphone, and the ear are arranged in order, it functions as a noise canceling
microphone.
[0003]
JP, 2009-65456, A
[0004]
However, in the headphone described in Patent Document 1, in the case where the microphone
functions as a microphone for collecting external sound, the microphone functions as merely
picking up the external sound.
On the other hand, in the case where the microphone functions as a noise canceling microphone,
the microphone only functions to detect noise which is contained before the sound emitted from
the speaker reaches the ear.
[0005]
Therefore, the external sound collected by the microphone can not be emitted from the integrally
mounted speaker, or the external sound collected by the microphone can not be subjected to
predetermined processing to be emitted from the speaker. Further, the sound input to the
speaker from another source and the external sound collected by the microphone can not be
appropriately combined or selected, and sound can not be emitted from the speaker.
Furthermore, noise cancellation can not be performed while collecting external sound.
[0006]
In view of such various conventional problems, the present invention can appropriately process
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2
the external sound collected by the microphone according to the situation, and can emit the
sound according to the situation according to the situation from the integrally mounted speaker
It is about realizing headphones.
[0007]
The present invention relates to a headphone provided with a pair of earphones in which a
speaker and a microphone are provided in one housing.
The microphone provided in the earphone unit of the headphone includes a plurality of external
sound collecting microphones arranged in a predetermined pattern on the back side of the
speaker. The headphone includes a directional sound pickup signal generation unit and a sound
generation signal generation unit. The directional sound collection signal generation unit
generates a plurality of directional sound collection signals each having predetermined sound
collection directivity, using the sound collection signals of the plurality of external sound
collection microphones. The sound generation signal generation unit generates a sound emission
signal with directivity to the speakers of each earphone unit using the plurality of directional
sound collection signals.
[0008]
In this configuration, a plurality of directional sound collection signals having directivity in a
plurality of different directions are generated from sound collection signals by a plurality of
microphones installed on the back side of the speaker. Then, by using such a plurality of
directional sound collection signals, a sound emission signal having characteristics and directivity
according to the situation is generated.
[0009]
The headphone according to the present invention also includes a sound identification unit that
identifies noise and effective sound contained in a plurality of directional sound pickup signals.
The sound emission signal generation unit generates a sound emission signal based on the
identification result of the sound.
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[0010]
In this configuration, an example of a specific method of forming the sound emission signal is
shown, and in order to form the sound emission signal, effective sound and noise (white noise
and the like) such as human calling voice and broadcast sound are shown. Identify Thereby, the
effective sound and the noise can be distinguished and processed, and can be reflected on the
sound emission signal.
[0011]
Further, the sound emission signal generation unit of the headphone according to the present
invention generates noise emission signals by suppressing noise and emphasizing effective
sound.
[0012]
In this configuration, a specific example of the sound emission signal using noise and effective
sound is shown, and the noise is suppressed and the effective sound is emphasized.
By this, it is possible to cut off the noise and allow the user to hear only the effective sound such
as human calling voice and broadcast voice. At this time, since the effective sound is formed to
have directivity, it can be emitted so that it can be heard from the direction in which the effective
sound has arrived. In this way, it is possible to concentrate in a nearly silent state, and to provide
an environment where it is possible to constantly concentrate on a user who needs only voice
related to himself such as a call, so that only the effective sound can be known the arrival
direction. I can hear it.
[0013]
Further, the sound emission signal generation unit of the headphone according to the present
invention generates the sound emission signal from only the noise.
[0014]
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In this configuration, a specific example of the sound emission signal using noise and effective
sound is shown, and only noise can be heard conversely.
In this way, it is possible to stop calling voice from others while emitting noise of a
predetermined level to a user who can concentrate a certain amount on a certain noise
environment and does not require calling etc. Provide an environment where you can focus on
[0015]
The headphone of the present invention also includes a non-sound information acquisition unit
that acquires non-sound information. The sound emission signal generation unit processes the
sound emission signal based on the non-sound information.
[0016]
In this configuration, non-sound information is used as information for processing the sound
emission signal. The non-sound information includes the time and position, which will be
described later, the attitude of the headphones, and data information if it has an external
communication function. As described above, if the sound emission signal is generated based on
the information other than the sound, the sound emission signal of various aspects can be
generated.
[0017]
The headphone according to the present invention also includes a non-sound information
acquisition unit for acquiring non-sound information. The sound emission signal generation unit
generates a sound emission signal based on the non-sound information and the effective sound.
[0018]
In this configuration, the sound emission signal can be generated by combining the non-sound
information described above and the valid sound.
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[0019]
Further, the non-sound information of the headphone according to the present invention includes
the position information, and the sound generation signal generation unit generates the sound
generation signal based on the position information and the effective sound.
[0020]
In this configuration, if the positional information and the predetermined sound are associated
with each other, the sound associated with the positional information and the effective sound can
be synthesized and emitted.
[0021]
Further, the sound emission signal generating unit of the headphone according to the present
invention performs processing of frequency characteristics on the sound emission signal.
[0022]
In this configuration, processing of the frequency characteristic can be performed on the sound
emission signal.
For example, it is possible to generate a signal for sound emission consisting only of signals in a
low frequency band, or a signal for sound emission that is artificially processed so as to broaden
the audible band.
[0023]
According to the present invention, in the headphone provided with the microphone, the external
sound collected by the microphone can be appropriately processed according to the situation,
and the speaker can emit the sound in various sound emission modes according to the situation.
[0024]
It is a block diagram showing the main composition of the headphones concerning a 1st
embodiment.
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6
It is a block diagram which shows the concrete structure of the directional sound collection
signal production | generation part 30R shown in FIG.
It is a block diagram which shows the concrete structure of the signal generation part 50 for
noise emission shown in FIG.
It is a block diagram which shows the main structures of the headphones 1B which concern on
the 2nd Embodiment of this invention.
It is a block diagram which shows the main structures of the headphones 1C which concern on
the 3rd Embodiment of this invention. FIG. 18 is a block diagram showing a configuration of an
overall adjustment unit 510 ′ ′ in the case of using the collected sound signals Smic0R and
Smic1R.
[0025]
A headphone according to a first embodiment of the present invention will be described with
reference to the drawings. FIG. 1 is a block diagram showing the main configuration of a
headphone 1 according to a first embodiment of the present invention.
[0026]
The headphone 1 includes a right earpiece case 10R, a left earpiece case 10L, and a main body
20. The right in-ear housing 10R is used in a state of being attached to the right ear RE of the
user, and the left in-ear housing 10L is used in a state of being attached to a left ear LE of the
user. The main body 20 is electrically connected to the right ear housing 10R and the left ear
housing 10L. Structurally, for example, the main body 20 is incorporated in the housing of the
headphone 1 that integrates the right ear housing 10R and the left ear housing 10L, or the right
ear housing 10R and the left ear connection. It may be formed separately from the ear housing
10L and connected to these by a cord.
[0027]
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The right-handed in-ear casing 10R has a structure fixed by being attached to the user's right ear
RE, and includes external sound collecting microphones 121RA and 121RB, a headphone speaker
11R, and a noise canceling microphone 122R.
[0028]
The external sound collecting microphones 121RA and 121RB are disposed on the back side of
the headphone speaker 11R.
The external sound collection microphones 121RA and 121RB are, for example, unidirectional
microphones, and are arranged so that the respective maximum sound collection sensitivity
directions are not parallel, and have a predetermined interval.
[0029]
The noise canceling microphone 122R is disposed on the front side of the headphone speaker
11R. The noise canceling microphone 122R is arranged such that the sound collecting direction
is in the direction of the speaker 11R.
[0030]
The external sound collecting microphones 121RA and 121RB pick up the external sound and
convert the external sound into an electric signal to output the sound collecting signals Smic0R
and Smic1R. The noise canceling microphone 122R picks up the sound from the speaker 11R
and the external sound, converts it into an electric signal, and outputs a noise canceling signal
SmicnR. The speaker 11R is driven by the sound emission signal SoutR to emit sound.
[0031]
The left earpiece housing 10L has a structure fixed by being attached to the user's left ear LE,
and includes external sound collecting microphones 121LA and 121LB, a headphone speaker
11L, and a noise canceling microphone 122L.
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[0032]
The external sound collecting microphones 121LA and 121LB are disposed on the back side of
the headphone speaker 11L.
The external sound collecting microphones 121LA and 121LB are, for example, unidirectional
microphones, and are arranged so that the maximum sound collecting sensitivity directions are
not parallel and that they have a predetermined interval.
[0033]
The noise canceling microphone 122L is disposed on the front side of the headphone speaker
11L. The noise canceling microphone 122L is disposed such that the sound collecting direction is
in the direction of the speaker 11L.
[0034]
The external sound collecting microphones 121 </ b> LA and 121 </ b> LB pick up external
sounds and convert them into electric signals, thereby outputting sound collection signals Smic 0
L and Smic 1 L. The noise canceling microphone 122L picks up the sound from the speaker 11L
and the external sound to convert it into an electric signal, and outputs a noise canceling signal
SmicnL. The speaker 11L is driven by the sound emission signal SoutL to emit sound.
[0035]
The main unit 20 includes a directional sound collection signal generation unit 30R, a directional
collection sound signal generation unit 30L, an analysis unit 40, and a sound generation signal
generation unit 50.
[0036]
The directional sound pickup signal generation unit 30R and the directional sound pickup signal
generation unit 30L are different in processing to the sound pickup signal on the right ear side or
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to the sound pickup signal on the left ear side. Although it exists, it has the same configuration.
Therefore, only the directional sound pickup signal generation unit 30R for the right ear will be
specifically described here.
[0037]
FIG. 2 is a block diagram showing a specific configuration of the directional-pickup signal
generation unit 30R, and FIG. 2A is a block diagram of the directional-pickup signal generation
unit 30R, and FIGS. 2B and 2C. Are block diagrams of the individual direction sound collection
signal generation unit 300A.
[0038]
The directional-pickup signal generation unit 30R includes the individual direction sound-pickup
signal generation units 300A to 300N.
In addition, although the case where the number of individual direction sound collection signal
production | generation parts corresponded to 300A-300N is provided here is shown, this
number may be suitably set according to the azimuth | direction resolution to require. More
specifically, it may be set so that an individual direction sound collection signal is generated at
each desired angle for decomposing the angle range of 180 ° corresponding to the right ear
side in the horizontal plane.
[0039]
The sound collection signals Smic0R and Smic1R from the external sound collection microphones
121RA and 121RB are input to the individual direction sound collection signal generation units
300A to 300N, respectively.
[0040]
Each individual direction sound collection signal production | generation part 300A-300N
produces | generates directivity collection sound signal SchA-SchN which becomes directivity by
the largest sound collection sensitivity which each differs based on sound collection signal
Smic0R, Smic1R.
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[0041]
Specifically, each individual direction sound collection signal production | generation part 300A300N is equipped with a structure as shown to FIG. 2 (B), (C).
The individual direction sound collection signal generation units 300A to 300N have the same
configuration except that the directivity to be formed is different. Therefore, the individual
direction sound collection signal generation unit 300A will be described as an example.
[0042]
(I) When using additive synthesis processing of collected sound signals The individual direction
collected sound signal generating unit 300A includes the filter units 311 and 312 and the adder
313.
The filter unit 311 performs predetermined filter processing on the collected sound signal
Smic0R, and outputs the result to the adder 313. The filter unit 312 performs predetermined
filter processing on the collected signal Smic0R, and outputs the result to the adder 313. The
filter units 311 and 312 perform, for example, gain adjustment and delay adjustment of a
collected sound signal to achieve desired directivity. The adder 313 adds the filtered sound
collection signals Smic0R and Smic1R to generate the individual direction sound collection signal
SchA.
[0043]
(Ii) In the case of using processing with a coefficient based on a collected sound signal The
individual direction collected sound signal generating unit 300A ′ includes a coefficient
determining unit 314 and a multiplier 315. The coefficient determination unit 314 determines a
coefficient for processing the directivity of the collected signal Smic0R based on the collected
signals Smic0R and Smic1R. For example, by using the collected sound signals Smic0R and
Smic1R, signals for determining coefficients of different directivity are generated. Then, using the
ratio of these coefficient determination signals, etc., the coefficient which can obtain high
sensitivity in a narrow and narrow area in the desired direction is determined. The multiplier 315
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multiplies the sound collection signal Smic0R by the coefficient to generate the individual
direction sound collection signal SchA ′ having the maximum sound collection sensitivity in the
desired direction and the narrow directivity.
[0044]
The right-handed individual direction sound collection signals SchA to SchN generated by the
directional collection sound signal generation unit 30R are input to the sound generation signal
generation unit 50. In addition, to the sound generation signal generation unit 50, the left-side
individual direction sound collection signals SchA to SchN generated in the same manner as in
the directionality sound collection signal generation unit 30R in the directionality sound
collection signal generation unit 30L. It is input. Further, these right and left individual direction
sound collection signals SchA to SchN are also input to the analysis unit 40.
[0045]
The analysis unit 40 analyzes the right and left individual direction pickup signals SchA to SchN.
Specifically, the analysis unit 40 sets a threshold for the levels of the individual direction sound
collection signals SchA to SchN, and determines that it is an effective sound if the level is equal to
or higher than the threshold, and the level is less than the threshold. Judge as noise. Further, the
analysis unit 40 detects the arrival direction of the effective sound based on the levels of the
individual direction sound collection signals SchA to SchN determined to be the effective sound.
The analysis unit 40 uses the determination result and the detection result as an analysis result,
generates sound emission control information from the analysis result, and outputs the sound
emission control information to the sound generation signal generation unit 50.
[0046]
The sound generation signal generation unit 50 includes a sound emission signal generation unit
50R for the right ear and a sound generation signal generation unit 50L for the left ear, and the
right and left individual direction sound collection signals SchA to SchN The noise emission
signals SoutR and SoutL are generated based on the noise emission control information. The
sound generation signal generation unit 50R generates the right sound emission signal SoutR
based on the right individual direction sound collection signals SchA to SchN and the sound
emission control information. The sound generation signal generation unit 50L generates a left
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sound emission signal SoutL based on the left individual direction sound collection signals SchA
to SchN and the sound emission control information.
[0047]
The processing of the sound on the right ear side in the sound emission signal generation unit
50R and the processing of the sound on the left ear side in the sound emission signal generation
unit 50L are different for right ear or left ear. However, since the block configuration is the same,
as in the case of the directional sound collection signal generation unit described above, only the
processing of the sound on the right ear side by the sound generation signal generation unit 50R
will be specifically described. .
[0048]
FIG. 3 is a block diagram showing a specific configuration of the noise generation signal
generation unit 50R.
FIG. 3A is a block diagram showing the configuration of the noise generation signal generator
50R, and FIG. 3B is a block diagram showing a specific configuration of the individual adjustment
unit 500 shown in FIG. 3A. FIG. 3C is a block diagram showing a specific configuration of the
overall adjustment unit 510 shown in FIG. 3A.
[0049]
The sound generation signal generation unit 50R includes an individual adjustment unit 500 and
a general adjustment unit 510. The individual adjustment unit 500 includes individual signal
processing units 501A to 501N and an adder 502. The individual signal processing units 501A
to 501N have the same configuration except that the parameters to be set are different. Each of
the individual signal processing units 501A to 501N includes an EQ (equalizer), a gain
adjustment unit, and a delay processing unit. For example, the individual signal processing unit
501A includes an EQ (equalizer) 505A, a gain adjustment unit 506A, and a delay processing unit
507A. In these EQ (equalizer) 505A, the gain adjustment unit 506A, and the delay processing
unit 507A, parameters for the individual direction sound collection signal SchA are set based on
the sound emission control information, and signal adjustment processing according to the
parameters is performed. To be executed.
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[0050]
The adder 502 generates the base sound emission signal Scm by adding the individual direction
sound collection signals SchA to SchN subjected to the signal adjustment processing in the
individual signal processing units 501A to 501N. The base sound emission signal Scm is input to
the overall adjustment unit 510.
[0051]
The whole adjustment unit 510 is described as an equalizer 511 (in the figure, described as EQ),
a gain adjustment unit 512, and a noise cancellation process unit 513 (in the drawing, an NC
process unit). ). Similar to the individual adjustment unit 500, parameters based on the sound
emission control information are set in the equalizer 511 and the gain adjustment unit 512, and
signal adjustment processing according to the parameters is executed.
[0052]
The noise cancellation processing unit 513 performs known noise cancellation processing using
the base sound emission signal Scm on which the equalizer processing and gain adjustment are
performed, and the noise cancellation signal SmicnR from the noise cancellation microphone
122R, and a sound emission signal Output SoutR. The sound emission signal SoutR is given to the
headphone speaker 11R of the right earpiece housing 10R and emitted from the headphone
speaker 11R to the right ear RE of the user.
[0053]
By using such a configuration, it is possible to generate a noise emission signal as follows.
[0054]
(Use Mode A) In the first mode, a specific sound or the like included in the collected signal is
emitted with directivity.
[0055]
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Specifically, the analysis unit 40 sets a threshold for the levels of the individual direction sound
collection signals SchA to SchN.
The analysis unit 40 determines a signal having a level equal to or higher than the threshold as
an effective sound signal, and determines a signal having a level lower than the threshold as a
noise signal.
[0056]
If the analysis unit 40 is set to emphasize the effective sound and emit sound, the sound emission
control information including the arrival direction of the effective sound at each timing is
emphasized so as to emphasize the effective sound and suppress the noise. It sets and gives to
the signal generation part 50 for noise emission.
The sound generation signal generation unit 50 appropriately processes the individual direction
sound collection signals SchA to SchN based on the sound emission control information, thereby
suppressing noise and emphasizing the effective sound, sound emission signals SoutR and SoutL.
Generate At this time, the sound emission signal generation unit 50 generates the sound
emission signals SoutR and SoutL as sound signals whose directivity is controlled so as to be
audible from the direction of arrival. This provides a quiet environment in which noise is
suppressed during periods when there is no effective sound such as a ringing tone or broadcast
sound, and when the effective sound is produced, the user is told the effective sound to be heard
from the direction of arrival. Can be Under the present circumstances, if the said process is used,
even if it is an effective sound from the back which is hard to hear normally by an earlobe, it can
hear to a user more reliably.
[0057]
If the analysis unit 40 is set to emit only noise at a low level, it includes the arrival direction of
the effective sound at each timing so as to suppress the effective sound even if the effective
sound is input. Sound emission control information is set and given to the sound emission signal
generation unit 50. The sound emission signal generation unit 50 appropriately processes the
individual direction sound collection signals SchA to SchN based on the sound emission control
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information to leave only noise at a predetermined level and suppress an effective sound.
Generate SoutR and SoutL. As a result, since the user is constantly provided with only a
predetermined level of low level noise, it is possible to provide an environment in which the user
can easily concentrate instead of an unnatural situation such as perfect silence. At this time, since
the effective sound is suppressed, even if the effective sound is generated, it is possible to
provide an environment in which the user can hardly hear it and can constantly concentrate.
[0058]
(Usage mode B) In the above-mentioned analysis part 40, the reference characteristic of a
predetermined special sound, for example, the sound of a wind, is memorized. Then, an operation
input for executing the second mode is performed by the operation unit (not shown), and when
the analysis unit 40 receives this, the following processing is executed.
[0059]
When the second mode is received, the analysis unit 40 analyzes the characteristics of the
individual direction sound collection signals SchA to SchN and compares them with the reference
characteristics. If the analysis unit 40 detects an individual direction sound collection signal
having a characteristic similar to the reference characteristic, the analysis unit 40 sets sound
emission control information so as to emphasize the individual direction sound collection signal,
and outputs the sound emission signal generation unit 50. give. The sound generation signal
generation unit 50 generates the sound emission signals SoutR and SoutL by performing signal
processing to emphasize the designated individual direction sound collection signal based on the
sound emission control information. At this time, in the same way as the above-mentioned
effective sound, the sound emission signals SoutR and SoutL are generated so that the arrival
direction can be known. This makes it possible for the user to easily understand the arrival
direction and strength of the specific sound, such as the wind arrival direction and strength.
[0060]
(Usage Mode C) An operation input for executing the third mode is performed by an operation
unit (not shown), and when the analysis unit 40 receives this, the following processing is
performed.
[0061]
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When the third mode is received, the analysis unit 40 sets a threshold for the levels of the
individual direction sound collection signals SchA to SchN.
The analysis unit 40 determines a signal having a level equal to or higher than the threshold as
an effective sound signal, and determines a signal having a level lower than the threshold as a
noise signal.
[0062]
The analysis unit 40 amplifies all effective sounds so as to be equal to or higher than a
predetermined level, sets sound emission control information so as to suppress noise, and gives
the sound emission signal generation unit 50. The sound generation signal generation unit 50
appropriately processes the individual direction sound collection signals SchA to SchN based on
the sound emission control information, thereby suppressing noise and emphasizing all effective
sounds to approximately the same amplitude level. The generated sound emission signals SoutR
and SoutL are generated.
[0063]
In such a sound emission signal, the sound can be heard at substantially the same level
regardless of whether the sound source position of the effective sound is near or far from the
user's position, so that it can be made to feel as if it can hear far sounds. it can. In this way, it is
possible to provide the user with extraordinary sounds that can not be experienced by ordinary
human hearing.
[0064]
Furthermore, by providing the sound emission signal generation unit 50 with a function to
compress and shift the frequency characteristics of the sound emission signal, the sound in
which the components of the frequency domain that can not be experienced by ordinary human
hearing can be provided. You can also
[0065]
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(Usage Mode D) An operation input for executing the fourth mode is performed by the operation
unit (not shown), and when the analysis unit 40 receives the operation, the following processing
is performed.
[0066]
When the fourth mode is received, the analysis unit 40 sets the sound emission control
information so as to have strong directivity in the forward direction of the user, and supplies the
sound emission control information to the sound generation signal generation unit 50.
The sound generation signal generation unit 50 uses the individual direction sound collection
signals SchA to SchN based on the sound emission control information to have a strong
directivity in the forward direction of the user and suppress noise signals. The signals SoutR and
SoutL are generated.
[0067]
With such a signal for sound emission, the user can hear only the sound from the front.
Thus, for example, when talking or discussing with another person, only the voice of the
conversation or the discussion can be presented to the user, and the user can concentrate on the
conversation or the discussion.
[0068]
At this time, it is also possible to add frequency characteristics depending on the user's earlobe
by the equalizer processing at the time of generation of the sound emission signal. This allows
the user to hear the sound as if he was directly listening to his own ear while wearing
headphones.
[0069]
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Also, in this mode, the external sound collecting microphones 121RA, 121RB, 121LA, and 121LB
can be used as microphones for collecting their own vocal sounds, and can be used for
teleconferencing and the like. In this case, the sound emission signal is generated so as to have
strong directivity in the forward direction of the user, particularly in the mouth direction, based
on the individual direction sound collection signals SchA to SchN. Then, the sound emission
signal is not emitted from the speakers 11R and 11L, but is transmitted to the outside from an
external communication terminal provided separately. On the other hand, the speakers 11R and
11L emit an external sound emission signal input from the external communication terminal. At
this time, if the sound emission control information is set so as to suppress noise and the sound
from the other place, it is possible to provide the other party with a sound emission signal
consisting of only the user's voice. In this way, the mode can also be used for communication in
the form of a remote conference with the outside, in which case only the voice of the user can be
transmitted and received, and concentrated conversation and discussion Can.
[0070]
In the case of this mode, in the above description, an example of directivity control of the sound
emission signal is shown, but in the directionality of the user in the direction of the user, as
described above, in the directivity collected sound signal generators 30R and 30L. Only a
directional sound pickup signal having strong directivity may be generated. This makes it
possible to simplify the process of generating the desired sound emission signal as a whole of the
headphone circuit.
[0071]
Next, a headphone according to a second embodiment will be described with reference to the
drawings. FIG. 4 is a block diagram showing the main configuration of a headphone 1B according
to a second embodiment of the present invention. The headphone 1 </ b> B of the present
embodiment is different from the headphone 1 shown in the first embodiment in that a timer
section 71 is provided as a non-sound information acquisition section. Therefore, in the
following, only different portions will be specifically described.
[0072]
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The clock unit 71 clocks time and provides time information to the analysis unit 40. The analysis
unit 40 generates sound emission control information based on the time information and
supplies the sound emission control information to the sound emission signal generation unit 50.
As sound emission control information in this case, for example, there are cases where the
volume is reduced, the volume is increased, and the like. The sound generation signal generation
unit 50 performs control to reduce or increase the volume (level) of the sound emission signals
SoutR and SoutL according to the sound emission control information.
[0073]
By using such a configuration, it is possible to generate a noise emission signal as follows.
[0074]
(Usage aspect E) The operation input which performs a 5th mode is performed by the operation
part which is not shown in figure, and if the analysis part 40 receives this, the process as shown
next will be performed.
[0075]
When the fifth mode is received, the analysis unit 40 acquires time information from the clock
unit 71.
The analysis unit 40 generates sound emission control information from the information on the
operation start time and the operation end time set when receiving the sleep mode or the like,
and the time information from the timer unit 71.
The sound emission control information includes information on the level reduction start timing,
information on the level decrease rate, and information on the sound emission end timing.
[0076]
The sound generation signal generation unit 50 gradually reduces the level of the base sound
emission signal Scm from the predetermined timing based on the sound emission control
information, and completely suppresses the level after a predetermined time. As a result, it is
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possible to emit sound so that the levels of the sound emission signals SoutR and SoutL gradually
decrease.
[0077]
By performing such processing, the user can be prevented from gradually hearing the ambient
sound, and a pseudo-sleeping state can be provided.
[0078]
Also, contrary to such processing for gradually reducing the level of the base sound emission
signal Scm, processing for gradually improving the level of the base sound emission signal Scm
can be performed.
As a result, the user can hear the ambient sound gradually louder, and can provide a simulated
sleeping state.
[0079]
Furthermore, by adding the filter processing unit to the sound emission signal generation unit
50, the sound emission signals SoutR and SoutL in which the sound in the low frequency band is
main can be emitted while the level is gradually reduced. . This can also provide a more pseudosleeping state.
[0080]
Moreover, although the example which sets sound emission control information only from time
information was shown in the above-mentioned description, you may perform an additional
process based on the detection result of an effective sound. For example, when an effective sound
having a predetermined level or higher is collected from a predetermined azimuth, the effective
sound may be interrupted and emitted. At this time, it is better to gradually increase the volume
of the effective sound.
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21
[0081]
Next, a headphone according to a third embodiment will be described with reference to the
drawings. FIG. 5 is a block diagram showing the main configuration of a headphone 1C according
to a third embodiment of the present invention. The headphone 1 </ b> C of this embodiment is
different from the headphone 1 shown in the first embodiment in that a sensor 72 is provided as
a non-sound information acquisition unit. Therefore, in the following, only different portions will
be specifically described.
[0082]
The sensor 72 senses non-sound information such as position information and the attitude of the
headphone 1 B, and supplies the non-sound information to the analysis unit 40. The analysis unit
40 generates sound emission control information based on the non-sound information, and
supplies the sound emission control information to the sound emission signal generation unit 50.
As sound emission control information in this case, there are, for example, processing
information and mixing information of sounds obtained based on non-sound information. The
sound emission signal generation unit 50 processes the base sound emission signal Scm
according to the sound emission control information, and outputs the sound emission signals
SoutR and SoutL.
[0083]
By using such a configuration, it is possible to generate a noise emission signal as follows.
[0084]
(Usage aspect F) The operation input which performs 6th mode is performed by the operation
part which is not shown in figure, and if the analysis part 40 receives this, the process as shown
next will be performed.
In the following, the case where a new sound signal is generated according to position
information using position information as non-sound information will be described as an
example.
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22
[0085]
When the sixth mode is received, the analysis unit 40 acquires position information from the
sensor 72. When acquiring the position information, the analysis unit 40 acquires sound
information previously associated with the position information. The sound information may be
stored in advance in a memory built in the headphone 1C, or may be obtained by providing
external communication means and communicating information from the outside. The analysis
unit 40 gives, to the sound generation signal generation unit 50, sound emission control
information of contents for combining the sound information with the base sound emission
signal Scm together with the acquired sound information.
[0086]
The sound emission signal generation unit 50 generates sound emission signals SoutR and SoutL
by synthesizing sound information with the base sound emission signal Scm based on the sound
emission control information, and outputs the generated signals. As a result, it is possible to
provide the user with special sound emission signals SoutR and SoutL according to the position.
That is, the user can enjoy the sound according to the location or can grasp the information
about the location by the sound.
[0087]
In the above embodiments, the noise cancellation signals SmicnR and SmiccnL from the noise
cancellation microphones 122R and 122L are used for noise cancellation processing, but the
external sound collection microphones 121RA, 121RB, 121LA, and 121LB The collected sound
signals Smic0R, Smic1R, Smic0L, Smic1L may be used. FIG. 6 is a block diagram showing a
configuration of the overall adjustment unit 510 ′ ′ in the case of using the collected sound
signals Smic0R and Smic1R. Also in FIG. 6, only the circuit configuration on the right ear side is
illustrated as in the above description, and the right ear side will be described below. The same
configuration and processing can be applied to the left ear side.
[0088]
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As shown in FIG. 6, in this case, the overall adjustment unit 510 ′ ′ is described as a noise
cancellation signal generation unit 515 (in the figure, a NC signal generation unit, as opposed to
the overall adjustment unit 510 described above. Further). The noise cancellation signal
generation unit 515 generates a noise cancellation signal using the collected sound signals
Smic0R and Smic1R. The noise cancellation processing unit 513 'executes the noise cancellation
processing using the noise cancellation signal based on the collected signals Smic0R and Smic1R
and the noise cancellation signal SmicnR.
[0089]
Even using such a method, the noise cancellation process can be reliably performed.
[0090]
Although the noise cancellation processing is always performed in the above description, a
configuration in which the noise cancellation processing is not performed may be used
depending on the situation.
[0091]
In the above description, an example in which the sound emission signals SoutR and SoutL are
emitted from the speakers 11R and 11L is shown, but separately, an external output line and an
external output terminal are provided, and the sound emission signal SoutR, SoutL may be output
to the outside.
[0092]
Furthermore, the headphones may have a function of recording the sound emission signals SoutR
and SoutL, the individual direction sound collection signals SchA to SchN, and the sound
collection signals Smic0R, Smic1R, Smic0L, and Smic1L.
As a result, it is possible to generate the sound emission signal further off-line, and to obtain
various sounds.
[0093]
In the above description, an example is shown in which two external sound collection
microphones are used on the left and right, but if there are a plurality of microphones, and three
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or more microphones are arranged in three dimensions, spatial orientation Resolution is
obtained.
[0094]
1-Headphones, 10R-right earpiece case, 10L-left earpiece case, 20-body portion, 30R, 30Ldirectivity sound collection signal generation portion, 50-sound emission signal generation
portion, 71- Timekeeping unit 311, 312-filter unit, 313-adder, 314-coefficient determination
unit, 315-multiplier, 500-individual adjustment unit, 510, 510 ', 510 "-general adjustment unit,
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