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JP2006340302

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2006340302
An object of the present invention is to increase the degree of freedom of installation location
and to allow a user to easily set the directivity of voice. SOLUTION: A microphone 2 is placed at a
listening position, a test voice beam according to a measurement signal is emitted from a speaker
array 10, sweeping is performed to gradually change the angle of the test voice beam, and the
microphone 2 collects a sound. The beam angle detection unit 5 obtains a radiation angle of
multi-channel sound based on the measurement data stored in the level measurement unit 4. The
control unit 6 determines the path distance of multi-channel audio, further determines the
directivity, and performs directivity setting on the beam control unit 8 that controls the
directivity of multi-channel audio. The beam angle detection unit 5 switches the radiation angle
detection process according to the installation situation of the speaker array, and the control unit
6 switches the path distance calculation process and the directivity determination process.
[Selected figure] Figure 1
Speaker array device
[0001]
The present invention relates to a speaker array device that reproduces surround sound by
outputting a plurality of sound beams, and more particularly to a speaker array device that has a
high degree of freedom in the installation location and can easily set the directivity of sound. .
[0002]
Conventionally, there has been proposed a technique for controlling the directivity of sound
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signal propagation by forming a plurality of sound beams using a speaker array composed of a
plurality of speakers arranged in a matrix (for example, see Patent Document 1) ).
By using this technology, it is not necessary to install a plurality of speakers around the user
(listener) as in the conventional surround system, and a plurality of sound beams are output from
a single panel-like speaker array. Surround sound can be played back.
[0003]
FIG. 16 is a top perspective view of a listening room in which the speaker array device disclosed
in Patent Document 1 is installed, and shows an example of realizing a 5.1 channel surround
system by the speaker array device. Here, in the following description, in the 5.1 channel
surround system, the left channel on the front is L (left), the right channel on the front is R
(right), the center channel is C (center), and the rear left The channel is referred to as SL
(surround left) ch, the rear right channel is referred to as SR (surround right) ch, and the
subwoofer is referred to as LFE (low frequency effects) ch.
[0004]
The speaker array device 213 shown in FIG. 16 is provided with a plurality of speaker units
arranged in a predetermined arrangement on a baffle plate, and the timing at which the surround
sound is output from each speaker unit is adjusted for each channel to emit beams. Delay control
so that the sound beam is focused at any point in space. Then, by reflecting the sound of each
channel to the ceiling or wall, a sound source is produced in the wall direction to reproduce the
multi-channel sound field.
[0005]
As shown in FIG. 16, the speaker array device 213 disposed in the listening room 220 directly
outputs the same sound as the center speaker (C) and the subwoofer (LFE) for bass enhancement
to the user U. In addition, the speaker array device 213 reflects the sound beam on the left and
right walls 221 and 222 of the listening room 220 to create a virtual Rch speaker 214 and a
virtual Lch speaker 215. Furthermore, the speaker array device 213 reflects the sound beam on
the left and right walls 221 and 222 and the rear wall 223 of the listening room 220 to create
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virtual SRch speakers 216 and virtual SLch speakers 217 on the left and right behind the user U.
As described above, in the surround system using the speaker array, the audio signal of each
channel is delay-controlled to be formed into a beam, and the beamed audio is reflected to the
wall to create a plurality of sound sources. It is possible to obtain a surround feeling as if a
speaker was installed.
[0006]
Japanese Patent Publication No. 2003-510924
[0007]
Conventionally, when installing a speaker array device, the speaker array device includes each
channel by giving the width, depth and height of the listening room as information of the
listening position of the user and shape information of the installation environment. The
directivity of the voice was automatically calculated and set.
If the speaker array device is not provided with such a setting function, or if the precondition of
the automatic calculation and the room environment are largely different, the expert listens to
the reproduction sound of the speaker array device at the listening position. The adjustment was
performed while manually changing the directivity of the audio of each channel.
[0008]
However, when the speaker array device automatically sets the directivity of the sound of each
channel based on the room shape and size information input by the user, the shape of the
listening room in which the speaker array device is installed and the speaker array device There
is a problem that the installation place is limited. That is, if the listening room in which the
speaker array device is installed has an ideal shape such as a rectangular parallelepiped or cube
as shown in FIG. 16 and the speaker array device is not installed at a position and direction that
can be calculated, the correct radiation angle of the audio beam Could not ask for. Therefore, in a
listening room with a special shape or a large-sized furniture, the directivity setting of the sound
of the speaker array device can not be set automatically, and it may be necessary to make
adjustment manually. The
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[0009]
In addition, when setting the directivity of the audio of each channel manually, the adjustment of
the audio beam has many parts depending on the sense of the setter, so individual differences
easily occur in the viewing environment, and the setting operation and knowledge It is necessary
to get used to it. Therefore, the adjustment of the voice beam is performed by the expert as
described above, and there is a problem that it is difficult for the user to make the adjustment.
[0010]
The present invention has been made to solve the above-mentioned problems, and it is an object
of the present invention to provide a speaker array device which has a high degree of freedom in
the installation location of the speaker array device and allows the user to easily set the
directivity of sound. To aim.
[0011]
The speaker array device according to the present invention adds a delay time to each of a
speaker array consisting of a plurality of speaker units arranged in a matrix or in a line and a
multi-channel audio signal input from the outside during normal listening. Directivity control
means for driving the speaker array so that voices corresponding to the multi-channel voice
signals are emitted with different directivity, and a measurement signal from the speaker array
when the directivity control means is set Sound beam sweeping means for emitting a test sound
beam according to the sound beam sweeping means and for gradually changing the radiation
angle of the test sound beam, and the listening position of the room where the speaker array is
installed. And a microphone for collecting the reflected sound, the signal level of the sound
collected by the microphone, and Storage means for storing, as measurement data, a relationship
with the radiation angle of the test voice beam, and determination means for determining the
installation state of the speaker array based on installation position information input from the
user and indicating the position of the speaker array And an angle detection means for
determining, for each channel, a radiation angle at which the multi-channel voice is to be output,
from the signal peak of the measurement data stored in the storage means and the radiation
angle of the test voice beam when this signal peak is obtained. And route distance calculating
means for obtaining, for each channel, a route distance for the multi-channel voice to reach the
listening position from the speaker array based on the radiation angle obtained by the angle
detecting means, and the angle detecting means The directivity of the multi-channel voice is
determined from the radiation angle determined by the path distance and the path distance
determined by the path distance calculating means. And setting means for setting the delay time
corresponding to the directivity to the directivity control means for each channel. The angle
detection means determines the delay time according to the installation situation of the speaker
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array. The detection process of the radiation angle is switched, the path distance calculation
means switches the calculation process of the path distance according to the installation situation
of the speaker array, and the setting means is the directivity according to the installation
situation of the speaker array It is intended to switch the sex determination process.
[0012]
Further, in one configuration example of the speaker array device according to the present
invention, in the case of wall installation in which the speaker array is disposed parallel to a wall
surface facing the user's listening position, the angle detection means The radiation angle is
determined to be a direct sound that directly reaches the listening position, and the radiation
angle is determined to be a reflected sound that is reflected by the wall of the room to reach the
listening position, while the sound of another channel is reflected on the wall of the room The
route distance calculation unit calculates the route distance corresponding to the wall installation
when the installation condition of the speaker array is the wall installation, and the setting unit
calculates the route distance when the installation condition of the speaker array is the wall
installation The directivity is determined so that the sound of the channel becomes a direct
sound, and the directivity is determined so that the sound of the other channel becomes a
reflected sound.
Further, in a configuration example of the speaker array device according to the present
invention, in the case of corner installation in which the angle detection means is arranged at a
corner of a room so that the speaker array intersects a wall surface, audio of the front channel
and center channel is The radiation angle is determined to be a direct sound that directly reaches
the listening position, and the radiation angle is determined to be a reflected sound that is
reflected by the wall of the room to reach the listening position, while the sound of another
channel is reflected on the wall of the room The path distance calculation means calculates the
path distance corresponding to the corner installation when the installation state of the speaker
array is the corner installation, and the setting means is a front when the installation state of the
speaker array is the corner installation Determine the directivity so that the sound of the channel
and center channel becomes direct sound, and the sound of other channels It is obtained so as to
determine the directivity so as to be reflected sound.
Further, one configuration example of the speaker array device according to the present
invention further comprises: notifying means for notifying the user of the start of measurement
before starting sweeping of the test voice beam by the voice beam sweeping means; And means
for starting the sweep of the test voice beam.
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[0013]
According to the present invention, when the speaker array device is installed indoors, a
microphone is installed at the listening position of the user to emit a test voice beam according to
the measurement signal from the speaker array and to emit the test voice beam. By sweeping the
angle gradually and collecting the sound with the microphone at this time, the sound output from
the speaker array directly to the microphone and the sound reflected from the wall of the room
to the microphone are signals. It can be detected as a peak of the level. As a result, when each
sound is output from the array speaker at what radiation angle, it can be easily detected in a
short time whether multi-channel sound can be optimally reproduced. As a result, according to
the present invention, the user can easily and properly set the directivity control means of the
speaker array device regardless of the shape of the room in which the speaker array device is
installed, the arrangement of furniture, and the like. Further, in the present invention, the angle
detection means switches the radiation angle detection process according to the installation
situation of the speaker array, the path distance calculation means switches the path distance
calculation process, and the setting means switches the directivity determination process. Thus,
various installation situations of the speaker array can be flexibly coped with.
[0014]
Further, according to the present invention, by providing notification means for notifying the
user of the start of measurement before starting the sweep of the test voice beam by the voice
beam sweeping means, the path of the test voice beam when the user is out of the room or at the
time of measurement. Can be retracted to an unobstructed position, which can increase the
reliability of the measurement. Furthermore, automatic measurement can be smoothly performed
by providing the voice beam sweeping means with start means for starting sweeping of the test
voice beam after a predetermined time from notification.
[0015]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings. FIG. 1 is a block diagram showing a configuration of a speaker array device according
to an embodiment of the present invention, and FIG. 2 is a front view showing an arrangement
example of speaker units on a baffle plate of the speaker array. The speaker array device 1
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according to the present embodiment includes a microphone 2, an A / D converter 3, a level
measurement unit 4, a beam angle detection unit 5, a control unit 6, a measurement signal
generation unit 7, and a beam control unit 8, an amplifier 9, a speaker array 10, an operation
unit 11, and a display unit 12. The level measurement unit 4 constitutes a storage unit, the beam
angle detection unit 5 constitutes an angle detection unit, the control unit 6 constitutes a
determination unit, a path distance calculation unit, a setting unit and a start unit, and the control
unit 6 The display unit 12 constitutes a notification unit, the beam control unit 8 constitutes a
directivity control unit, and the measurement signal generation unit 7 and the beam control unit
8 constitute an audio beam sweep unit. The portion of the speaker array device 1 shown in FIG. 1
excluding the microphone 2 is referred to as a main body 1 h.
[0016]
The microphone 2 is a nondirectional microphone and is connected to the A / D converter 3. The
A / D converter 3 converts an analog voice signal collected by the microphone 2 into a digital
voice signal in the voice beam setting mode in which the beam control unit 8 is set by obtaining
the radiation angle and the path distance of voice of each channel. And output to the level
measurement unit 4.
[0017]
The level measuring unit 4 stores measurement data collected by the microphone 2 in the sound
beam setting mode. The beam angle detection unit 5 reads out the measurement data stored in
the level measurement unit 4 after the sound collection in the voice beam setting mode is
finished, detects peaks of the measurement data, and detects Cch, Lch, and so on based on each
peak. A radiation angle at which sound of each channel of Rch, SLch, and SRch is output is
detected, and the detection result is notified to the control unit 6.
[0018]
The measurement signal generation unit 7 outputs a measurement signal to the beam control
unit 8 in the sound beam setting mode. In the sound beam setting mode, the beam control unit 8
outputs the test sound beam corresponding to the measurement signal from the measurement
signal generation unit 7 from the speaker array 10 while changing its radiation angle, and during
normal listening after the setting is completed. The voice of each channel is given directivity
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according to the setting and output from the speaker array 10.
[0019]
The speaker array 10 has a plurality of speaker units 101 arranged in a matrix or in a line on the
front baffle plate 100. The example of FIG. 2 shows an example in which the speaker units 101
are arranged in a matrix.
[0020]
Here, the principle of directivity control by the speaker array device 1 will be described with
reference to FIG. A large number of speaker units 101-1 to 101-n are arranged in a line, and an
arc whose distance from the focal point P is L is Z, and a straight line connecting the focal point
P and each of the speaker units 101-1 to 101-n is It is considered to arrange the virtual speaker
units 102-1 to 102-n as shown by the broken lines in FIG. Since the distances from the virtual
speaker units 102-1 to 102-n to the focal point P are all L, the sound emitted from each of the
speaker units 102-1 to 102-n simultaneously reaches the focal point P.
[0021]
In order to simultaneously cause the sound emitted from the actual speaker unit 101-i (i = 1, 2,...
N) to reach the focal point P, the speaker unit 101-i and the corresponding virtual speaker unit
102 A delay (time difference) corresponding to the distance between -i and i may be added to the
sound output from the speaker unit 101-i. That is, when viewed from the focal point P, control is
performed as if the virtual speaker units 102-1 to 102-n are disposed on the arc Z. As a result, at
the focal point P, the phases of the outputs of the respective speaker units 101-1 to 101-n are
uniform, and a peak of sound pressure is generated. As a result, a sound pressure distribution
with directivity is obtained as if emitting an audio beam toward the focal point P. Further, by
arranging the speakers not in a line but in a matrix, it is possible to output an audio beam having
three-dimensional directivity.
[0022]
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FIG. 4 is a diagram schematically showing the processing of the beam control unit 8 for an audio
signal. The delay unit 80-L generates Lch audio signals for the number (n) of speaker units added
with delay times to the input Lch audio signal, and the delay unit 80-R generates the input Rch
audio signal. The delay unit 80-C generates n Cch audio signals each having a delay time added
to the input Cch audio signal. The delay unit 80-SL generates n SLch audio signals in which a
delay time is added to the input SLch audio signal, and the delay unit 80-SR generates the input
SRch audio signal. It generates n SRch audio signals to each of which a delay time is added. The
delay times to be added by the delay units 80 -L, 80 -R, 80 -C, 80 -SL, and 80 -SR are set
separately by the control unit 6.
[0023]
The adder 81-1 outputs Lch, Rch, Cch, SLch, and SRch for the speaker unit 101-1 output from
the delay units 80-L, 80-R, 80-C, 80-SL, and 80-SR. The audio signals AO-1 are generated by
adding up the respective audio signals, and the adder 81-2 adds the audio signals of Lch, Rch,
Cch, SLch, and SRch for the speaker unit 101-2 to generate an audio signal. AO-2 is generated,
and the adder 81-n adds each audio signal of Lch, Rch, Cch, SLch, and SRch for the speaker unit
101-n to generate an audio signal AO-n.
[0024]
In the voice beam setting mode, only the measurement signal of one channel is input to the beam
control unit 8. Therefore, any of the delay units 80-L, 80-R, 80-C, 80-SL, and 80-SR The
measurement signal may be input to one or the other.
The amplifiers 9-1 to 9-n amplify the audio signals AO-1 to AO-n respectively output from the
beam control unit 8 to drive the speaker units 101-1 to 101-n.
[0025]
The operation unit 11 receives various setting inputs from the user when, for example, the
speaker array device 1 is installed, and passes the input information to the control unit 6. The
display unit 12 displays the content to be transmitted to the user based on the control signal
output from the control unit 6.
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[0026]
The control unit 6 controls the entire speaker array apparatus, and in the audio beam setting
mode, causes the measurement signal generation unit 7 and the beam control unit 8 to sweep the
test audio beam, and at the same time, measures the measurement data at this time as a level
measurement unit. 4, and the beam control unit 8 is set based on the measurement data.
[0027]
Next, the operation of the speaker array device 1 of the present embodiment will be described.
FIG. 5 is a flowchart showing the operation of the speaker array device 1 in the sound beam
setting mode. First, the user U installs the speaker array 10 at a desired position in the listening
room and the microphone 2 at the listening position. Then, the user U operates the operation
unit 11 of the main unit 1h, inputs installation position information indicating the position of the
speaker array 10 in the listening room, and executes the voice beam setting mode (step S1 in FIG.
5).
[0028]
When the user U arranges the speaker array 10 parallel to the wall 21 of the listening room 20
facing the user U as shown in FIG. 6A, the installation position information is, for example, “wall
installation”, as shown in FIG. In the case where the speaker array 10 is disposed at the corner
of the listening room 20 so as to intersect the wall surface as in 6 (b), the installation position
information is, for example, "corner installation". To input the installation position information,
the control unit 6 displays, for example, a selection screen 120 as shown in FIG. 7 on the display
unit 12 and the user U operates the operation unit 11 to set “wall installation” or “corner
Select either "Install".
[0029]
When the control unit 6 recognizes that the installation position information has been input and
the voice beam setting mode has been started, the control unit 6 causes the display unit 12 to
display a save request screen 121 as shown in FIG. 8, for example. The evacuation from the room
20 is urged, and in the state as it is, it waits for a fixed time (step S2). The reason for urging the
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user U to withdraw from the listening room 20 is that if the user U is in the listening room 20, a
measurement error may occur.
[0030]
The control unit 6 measures the listener distance from the speaker array 10 to the microphone 2
(listening position) after a predetermined time has elapsed since displaying the evacuation
request screen 121 (step S3). In order to measure the listener distance, the control unit 6
controls the measurement signal generation unit 7 to output a pulse signal for measuring the
listener distance, and output from the speaker array 10 a sound corresponding to the pulse
signal. At this time, the beam control unit 8 does not have to add a delay time to the pulse signal.
The sound output from the speaker array 10 is collected by the microphone 2 and recorded in
the level measuring unit 4 as a digital signal through the A / D converter 3.
[0031]
The control unit 6 measures an elapsed time from the output of the pulse signal from the
measurement signal generation unit 7 to the beam control unit 8 until the level measurement
unit 4 obtains the pulse signal, and the listener distance is based on this elapsed time. Is
calculated (step S4).
[0032]
Next, the control unit 6 sweeps the test speech beam (step S5).
FIG. 9 is a top perspective view of the listening room 20 in which the speaker array device 1 is
installed, for explaining the sweep operation of the test sound beam according to the present
embodiment. Here, the case where the listening room 20 is a rectangular parallelepiped having
an ideal shape will be described. As shown in FIG. 9A, the baffle plate of the speaker array 10 is
parallel to the front wall 21 so as to face the rear wall 23 at the center of the front wall 21 of the
listening room 20 in the speaker array 10. Install. Also, the microphone 2 is placed at the
listening position of the user. At this time, the height of the microphone 2 may be adjusted to the
position of the user's ear.
[0033]
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In step S5, the control unit 6 of the speaker array device 1 causes the measurement signal
generation unit 7 to output a measurement signal to the beam control unit 8, and causes the
speaker array 10 to output a test sound beam according to the measurement signal. At this time,
according to an instruction from the control unit 6, as shown in FIG. 9A, the beam control unit 8
operates as a baffle plate from one direction (hereinafter referred to as a 0 degree direction)
parallel to the baffle plate of the speaker array 10. A sweep is performed to progressively change
the emission angle of the test speech beam to the other parallel direction (hereinafter referred to
as the 180 degree direction). It is also possible to set the radiation angle θ of the test sound
beam to a value other than 0 ° ≦ θ ≦ 180 ° depending on the shape of the listening room
where the speaker array 10 is installed and the installation position of the speaker array 10.
[0034]
Thus, when the test sound beam is swept, the test sound beam is transmitted to the left wall 22,
the rear wall 23, and the right wall 24 of the listening room 20 according to the radiation angle
θ of the test sound beam output from the speaker array 10. Is reflected. At this time, the
microphone 2 collects the direct sound of the test sound beam and the indirect sound reflected
by each wall. The A / D converter 3 converts an analog voice signal collected by the microphone
2 into a digital voice signal, and the level measuring unit 4 stores the digital voice signal as
measurement data.
[0035]
For example, as shown in FIG. 9B, in the case of the radiation angle θ = θ1, the test voice beam
34a is reflected by the left wall 22 and the right wall 24 and then reaches the microphone 2, so
θ1 is a voice beam of Lch. Is not suitable as an angle for outputting Further, in the case of the
radiation angle θ = θ2, the test voice beam 34b is reflected by the left wall 22 and then reaches
the microphone 2, so that θ2 is an appropriate angle for outputting the Lch voice beam. Further,
in the case of the radiation angle θ = θ3, the test voice beam 34c is reflected by the left wall 22
and the back wall 23 and then reaches the microphone 2, so that θ3 is an appropriate angle for
outputting the SLch voice beam. is there. Furthermore, in the case of the radiation angle θ = θ4,
since the test voice beam 34d directly reaches the microphone 2, θ4 is an appropriate angle for
outputting the Cch voice beam. In this way, it is possible to determine the optimum radiation
angle for outputting the sound of each channel.
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[0036]
Preferably, the measurement signal used when sweeping the test sound beam is an audio signal
that is not correlated and is limited to a frequency band in which directivity can be controlled by
the speaker array device 1.
[0037]
After the sweep of the test voice beam, the control unit 6 determines whether the wall of the
speaker array 10 is installed or a corner is installed, based on the installation position
information input in step S1 (step S6).
The reason for performing such a determination is that the processing needs to be branched
according to the installation situation of the speaker array 10 in the processing of detecting the
radiation angle of the voice, the processing of calculating the path distance, and the processing of
determining directivity. It is from.
[0038]
When it is determined in step S6 that the wall is to be installed, the control unit 6 causes the
beam angle detection unit 5 to perform the radiation angle detection process for installing the
wall (step S7). FIG. 10 is a diagram for explaining a radiation angle detection process for wall
installation, and FIG. 10 (a) is a top perspective view showing a sweep operation of a test voice
beam, and FIG. 10 (b) is a sweep of the test voice beam It is a figure which shows the
measurement data memorize | stored in the level measurement part 4 by operation | movement.
In FIG. 10B, the horizontal axis is the radiation angle of the test voice beam, and the vertical
width is the gain of voice data collected by the microphone 2.
[0039]
In order to easily detect a plurality of peaks from the measurement data shown in FIG. 10B, the
threshold value Th is preset to a level at which only the sound beam reflected up to the wall can
be detected up to two times. In step S7, the beam angle detection unit 5 analyzes the
measurement data of the level measurement unit 4, and the radiation angle θa3 (FIG. 10 (a)) is
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obtained when the peak Pa3 with the highest level is obtained above the threshold Th. Let the
angle of the test sound beam 47 be a radiation angle for outputting the sound of Cch. The reason
why the radiation angle θa3 is the radiation angle of the Cch sound is that the Cch sound is
directly radiated to the user's listening position. Note that, even if the level is maximum, the beam
angle detection unit 5 excludes the peak having a pulse width equal to or less than a
predetermined value as noise.
[0040]
Subsequently, the beam angle detection unit 5 assigns peaks such as surround channels and
front channels, which are present on both sides of the peak Pa3 on the horizontal axis in FIG. ,
Determine the radiation angle. That is, the beam angle detection unit 5 determines the radiation
angle θa1 (the angle of the test voice beam 45 in FIG. 10A) when the peak Pa1 is obtained as
the radiation angle for outputting the Lch voice beam, and obtains the peak Pa2. The radiation
angle θa2 (the angle of the test voice beam 46) at the specified time is the radiation angle for
outputting the voice beam of SLch, and the radiation angle θa4 (the angle of the test voice beam
48) when the peak Pa4 is obtained is the voice of SRch The radiation angle at which the beam is
output is taken, and the radiation angle θa5 (the angle of the test sound beam 49) when the
peak Pa5 is obtained is taken as the radiation angle at which the sound beam of Rch is outputted.
Thus, the optimum radiation angle for outputting the sound of each channel can be obtained, and
the beam angle detection unit 5 notifies the control unit 6 of the obtained radiation angle.
[0041]
Next, the control unit 6 calculates the path distance until the sound 45 to 49 of each channel
reaches the listening position from the speaker array 10 (step S8). The path distance of the audio
47 of Cch is the listener distance obtained in step S4. In addition, assuming that the listening
room 20 is a square in a plan view, the control unit 6 sets Lch to the listener distance, the
radiation angle θa1 of the Lch audio beam 45, and the installation position of the speaker array
10 previously input by the user. The path distance of the voice beam 45 is geometrically
calculated. Similarly, the control unit 6 geometrically calculates the path distances of the SLch,
SRch, and Rch voice beams 46, 48, 49. This completes the detection of the radiation angle of the
sound beam and the calculation of the path distance in the case of wall installation.
[0042]
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On the other hand, when it is determined that the corner is set in step S6, the control unit 6
causes the beam angle detection unit 5 to perform the radiation angle detection process for
corner setting (step S9). FIG. 11 is a diagram for explaining a radiation angle detection process
for corner installation, and FIG. 11 (a) is a top perspective view showing a sweep operation of a
test speech beam, and FIG. 11 (b) is a sweep of the test speech beam It is a figure which shows
the measurement data memorize | stored in the level measurement part 4 by operation |
movement.
[0043]
When measurement data as shown in FIG. 11B is stored in the level measurement unit 4 by
sweeping the test speech beam, peaks Pb1 to Pb5 having gain levels higher than the threshold
Th are obtained. In this case, since there are five peaks whose gain levels are higher than the
threshold value Th, the beam angle detection unit 5 sets the radiation angle of the voice beam as
in the case of FIG. However, as shown in FIG. 11A, the test voice beam 55 that the beam angle
detector 5 intends to assign to Lch is a voice beam reflected twice on the left wall 22 and the
back wall 23 of the listening room 20, The test sound beam 59 to be assigned to Rch is a sound
beam reflected twice on the front wall 21 and the right wall 24, and the sound of the front
channel can be heard from the direction where the sound of the surround channel should be
heard (obliquely behind the listening position) Therefore, the angles θb1 and θb5 are not
appropriate as radiation angles for outputting the sound beam of the front channel.
[0044]
Therefore, in the case of corner installation, beam angle detection unit 5 of the present
embodiment detects peaks Pb1, Pb2, Pb4 and Pb5 two by two symmetrically with center peak
Pb3 in between as shown in FIG. 11 (b). Even so, two peaks Pb2 and Pb4 close to the center peak
Pb3 are assigned to the surround channels, and the peaks Pb1 and PB5 are ignored.
[0045]
That is, the beam angle detection unit 5 analyzes the measurement data of the level
measurement unit 4 and determines the radiation angle θb3 (the test voice of FIG. 11A) when
the peak Pb3 having the highest level above the threshold Th is obtained. Let the angle of the
beam 57 be a radiation angle at which Lch, Rch and Cch voices are output.
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15
Further, the beam angle detection unit 5 sets the radiation angle θb2 (angle of the test voice
beam 56) when the peak Pb2 is obtained as the radiation angle for outputting the voice beam of
SLch, and the radiation angle when the peak Pb4 is obtained Let θb4 (the angle of the test
sound beam 58) be a radiation angle at which the sound beam of SRch is output. The beam angle
detection unit 5 notifies the control unit 6 of the calculated radiation angle.
[0046]
Next, the control unit 6 calculates the path distance of the sound of each channel (step S10). In
the case of corner installation, the control unit 6 sets the sound of Lch and Rch on the front as a
direct sound together with Cch without narrowing the beam. Therefore, the path distances of
Lch, Rch, and Cch voices are listener distances obtained in step S4. Further, assuming that the
listening room 20 is a square in a plan view, the control unit 6 sets SLch to the listener distance,
the radiation angle θb2 of the audio beam 56 of SLch, and the installation position of the
speaker array 10 previously input by the user. The path distance of the voice beam 56 is
geometrically calculated. Similarly, the control unit 6 geometrically calculates the path distance
of the voice beam 58 of SRch. This completes the detection of the radiation angle of the voice
beam and the calculation of the path distance in the case of corner installation.
[0047]
The control unit 6 causes the display unit 12 to display an in-measurement notification screen
122 as shown in FIG. 12, for example, until the process of steps S3 to S10 is completed. After
completion of the processing in step S8 or S10, the control unit 6 causes the display unit 12 to
display a measurement end notification screen 123 as shown in FIG. 13, for example, and
inquires whether to reflect the measurement result on the setting of the speaker array device 1
(Step S11). When the user selects to reflect the measurement result, the control unit 6 performs
setting of the beam control unit 8 (step S12).
[0048]
In step S12, in the case of wall installation, the control unit 6 sets the focal point in the direction
of the radiation angle θa3 of the Cch voice, and delays the Cch voices radiated from the
respective speaker units 101 simultaneously to this focal point. The delay time of the unit 80-C is
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calculated for each speaker unit, and the calculated delay time is set in the delay unit 80-C.
Thereby, the voice of Cch is output as a direct sound. Further, the control unit 6 determines the
space of the focal point of the Lch audio beam from the longitudinal and lateral lengths of the
listening room 20, the installation position of the speaker array 10, the radiation angle θa1 of
the Lch audio beam and the path distance The coordinates are calculated, and the delay time of
delay unit 80-L is calculated for each speaker unit so that the Lch sound radiated from each
speaker unit 101 simultaneously reaches this focal point, and the calculated delay time is
calculated by delay unit 80. Set to -L. The spatial coordinates of the focal point are obtained from,
for example, predetermined setting rules, the relationship between the longitudinal length of the
listening room, the installation position of the speaker array, the radiation angle and path
distance of the audio beam, and the listener distance be able to. Further, the delay time for each
speaker unit can be uniquely calculated based on the space coordinates of each of the speaker
units 101-1 to 101-n and the space coordinates of the focal point.
[0049]
Similarly, the control unit 6 calculates the spatial coordinates of the focal point from the
radiation angle θa5 of the audio beam of Rch and the path distance, etc., and delays so that the
audio of Rch radiated from each speaker unit 101 reaches this focal point simultaneously. The
delay time of the unit 80-R is calculated for each speaker unit, and the delay time is set in the
delay unit 80-R. In addition, the control unit 6 calculates spatial coordinates of the focal point
from the radiation angle θa 2 of the voice beam of SLch and the path distance, etc., and the
delay unit so that the voice of SLch radiated from each speaker unit 101 simultaneously reaches
this focal point. The delay time of 80-SL is calculated for each speaker unit, and the delay time is
set in the delay unit 80-SL. Furthermore, the control unit 6 calculates the spatial coordinates of
the focal point from the radiation angle θa4 of the voice beam of SRch and the path distance,
etc., and the delay unit so that the voice of SRch radiated from each speaker unit 101 reaches
this focal point simultaneously. The delay time of 80-SR is calculated for each speaker unit, and
the delay time is set in the delay unit 80-SR. This completes the setting of step S12.
[0050]
With the above settings, when each audio signal of Lch, Rch, Cch, SLch, SRch is input to the
speaker array device 1 during normal listening, as shown in FIG. The position is reached directly,
the sound of Lch is reflected by the left wall 22 of the listening room 20 and then the listening
position is reached, the sound of Rch is reflected by the right wall 24 and then the listening
position, and the sound of SLch is the left wall The sound of the SRch is reflected by the right
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wall 24 and further reflected by the rear wall 23, and reaches the listening position. Thus, the
user U can enjoy the 5.1 channel surround sound field at the listening position.
[0051]
On the other hand, in step S12, in the case of corner installation, the control unit 6 sets the focus
in the direction of the radiation angle θb3 of the Cch sound, and the Cch sound radiated from
each speaker unit 101 simultaneously reaches this focus. The delay time of the delay unit 80-C is
calculated for each speaker unit, and the calculated delay time is set in the delay unit 80-C.
Similarly, the control unit 6 sets the focal points of Lch and Rch in the direction of the radiation
angle θb3, and sets the calculated delay times in the delay units 80-L and R. As a result, Lch,
Rch, and Cch voices are output as direct sounds.
[0052]
Further, the control unit 6 determines the space of the focal point of the voice beam of SLch from
the longitudinal and lateral lengths of the listening room 20, the installation position of the
speaker array 10, the radiation angle θb2 of the voice beam of SLch and the path distance, and
the listener distance. The coordinates are calculated, and the delay time of the delay unit 80-SL is
calculated for each speaker unit so that the SLch sound radiated from each speaker unit 101
simultaneously reaches this focal point, and the delay time is delayed by the delay unit 80-SL. Set
to Similarly, the control unit 6 calculates the spatial coordinates of the focal point from the
radiation angle θb4 of the voice beam of SRch and the path distance, etc., and delays so that the
voice of SRch radiated from each speaker unit 101 reaches this focal point simultaneously. The
delay time of the unit 80-SR is calculated for each speaker unit, and the delay time is set in the
delay unit 80-SR. This completes the setting of step S12.
[0053]
With the above settings, when each audio signal of Lch, Rch, Cch, SLch, SRch is input to the
speaker array device 1 during normal listening, as shown in FIG. 15, the audio of Lch, Rch, Cch
The listening position of the user U is directly reached, the sound of SLch is reflected by the back
wall 23 of the listening room 20 and then the listening position, and the sound of SRch is
reflected by the right wall 24 and then the listening position. Thus, the user U can enjoy the 5.1
channel surround sound field at the listening position.
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[0054]
As described above, in the present embodiment, setting of directivity that is difficult in the
conventional speaker array device can be performed easily and quickly. In addition, since the test
voice beam is swept and the radiation angle of each voice is determined from the measurement
result, the user can easily and easily regardless of the shape of the listening room where the
speaker array device is installed and the arrangement of furniture. It can be set properly. Further,
in the present embodiment, the beam angle detection unit 5 switches the radiation angle
detection processing according to the installation situation of the speaker array, the control unit
6 switches the route distance calculation processing, and the control unit 6 has directivity Since
the decision process of is switched, various installation situations of the speaker array can be
flexibly coped with.
[0055]
The present invention can be applied to a speaker array device.
[0056]
It is a block diagram showing composition of a speaker array device concerning an embodiment
of the invention.
It is a front view which shows the example of arrangement | positioning of the speaker unit of
the speaker array of FIG. It is a figure for demonstrating the principle of directivity control by a
speaker array apparatus. It is a figure which represents typically the process of the beam control
part in the speaker array apparatus of FIG. It is a flowchart which shows the operation |
movement at the time of the audio | voice beam setting mode of the speaker array apparatus of
FIG. They are a top perspective view of a listening room at the time of wall installation of a
speaker array, and a top perspective view of a listening room at the time of corner installation of
a speaker array. It is a figure which shows one example of the selection screen displayed on the
display part of a speaker array apparatus at the time of installation position information input. It
is a figure which shows one example of the evacuation request screen displayed on the display
part of a speaker array apparatus before measurement. It is a figure for demonstrating the sweep
operation | movement of the test sound beam in embodiment of this invention. It is a figure for
demonstrating the radiation angle detection process for wall installation in embodiment of this
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invention. It is a figure for demonstrating the radiation angle detection process for corner
installation in embodiment of this invention. It is a figure which shows one example of the
notification screen during measurement displayed on the display part of a speaker array
apparatus during measurement. It is a figure which shows one example of the measurement
completion notification screen displayed on the display part of a speaker array apparatus at the
time of completion | finish of measurement. FIG. 1 is a top perspective view of a surround system
implemented by a wall mounted loudspeaker array in accordance with an embodiment of the
present invention. FIG. 1 is a top perspective view of a surround system implemented by a
corner-mounted speaker array in accordance with an embodiment of the present invention. It is
an upper surface perspective view which shows the example which implement | achieves a
surround system by a speaker array apparatus single-piece | unit.
Explanation of sign
[0057]
DESCRIPTION OF SYMBOLS 1 ... Speaker array apparatus, 2 ... Microphone, 3 ... A / D converter,
4 ... Level measurement part, 5 ... Beam angle detection part, 6 ... Control part, 7 ... Measurement
signal generation part, 8 ... Beam control part, 9 ... Amplifier, 10: speaker array, 11: operation
unit, 12: display unit.
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