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JP2006114990

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DESCRIPTION JP2006114990
The present invention provides an acoustic device capable of continuously collecting sound with
optimum directivity even if the frequency band of collected sound changes dynamically. A
speaker array 1 is formed by arranging a plurality of speakers SM connected to an input audio
signal processing unit 2 or an output audio signal processing unit 3 by a switch SW. And these
speakers SM are arranged in the shape of a triangle from which the center position of the
horizontal direction differs between speakers SM adjacent to the perpendicular direction. In the
case of collecting sound in the low frequency band, in the case of collecting sound in a wide
frequency band by making a plurality of speakers SM arranged at a predetermined pitch function
as microphones across both ends of the speaker array 1 in the horizontal direction Makes all the
vertically adjacent two rows of loudspeakers SM function as microphones. [Selected figure]
Figure 4
Sound equipment
[0001]
The present invention relates to an acoustic device in which a plurality of sound collection
elements capable of switching and operating a speaker function and a microphone function are
formed in an array.
[0002]
2. Description of the Related Art Conventionally, in a hands-free telephone device or the like, an
acoustic device is used in which a plurality of sound collection elements (audio signal converters)
capable of operating by switching between a speaker function and a microphone function are
formed.
09-05-2019
1
[0003]
As such an audio apparatus, Patent Document 1 includes a plurality of microphones and a voice
identification unit that identifies a speaker (voice generation source) by voice signals from the
microphones, and each microphone is based on the voice identification result. A hands-free
device is disclosed that controls the directivity of an audio signal input from the speaker and
improves the directivity toward the speaker.
[0004]
Further, Patent Document 2 discloses a transducer array in which a plurality of electrostatic type
transducers using thin film diaphragms are arrayed to control reception of sound waves and
transmission of sound waves for each transducer.
JP, 2001-359185, A JP, 10-234, 100 A
[0005]
However, in the hands-free device described in Patent Document 1, the arrangement pattern
(microphone array) of the microphones is fixed, and the frequency characteristic of directivity by
this microphone array is determined by the hardware configuration.
Therefore, when it is used under a predetermined fixed condition, an optimum directivity can be
obtained, but a condition in which a plurality of frequency states are dynamically changed such
as propagating only human voice or propagating music. However, it is not possible to obtain the
optimum directivity.
[0006]
Moreover, although the transducer array described in Patent Document 2 can change the
microphone array dynamically, in order to receive a certain frequency, for example, human voice,
the microphone array can be varied to obtain predetermined directivity. It is what you get.
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2
Therefore, as described above, a plurality of frequency states, that is, propagation (sound
collection and sound emission) of only sounds (sound waves) in a relatively low frequency band,
and wide band sounds (sound waves) including high frequencies In a state where the sound
collection and sound emission dynamically change, it is not possible to continuously obtain the
optimum directivity.
[0007]
Therefore, an object of the present invention is to provide an acoustic device capable of
continuously collecting and emitting sound with optimum directivity even if the frequency band
of the collected sound changes dynamically. .
[0008]
The sound device according to the present invention includes a sound collection element array in
which a plurality of sound collection elements functioning as a microphone or a speaker are
arranged by switching, a sound collection element functioning as a microphone, and a sound
collection element functioning as a speaker. Frequency of audio signal for inputting / outputting
an array pattern on a sound emitting element array of switching means for switching
independently for each sound emitting element, sound emitting element functioning as a
microphone and sound emitting element functioning as a speaker A pattern storage unit storing
a plurality of patterns according to a band, a selection unit selecting an array pattern according
to a frequency band, and a control unit reading out the selected array pattern from the pattern
storage unit and setting it as a switching unit It is characterized by
[0009]
In this configuration, the sound collection element (sound collection element) that functions as a
microphone on the sound collection element array based on the frequency band of the sound
signal collected by the sound device and the sound collection element (sound generation that
functions as a speaker The array pattern with the element is switched.
At this time, the array pattern of the microphone and the speaker is stored in advance in the
pattern storage unit, and the control unit is selected from the plurality of array patterns stored in
the pattern storage unit according to the array pattern selected by the selection unit. By reading
out the array pattern and controlling the switching means, the function of the sound collection
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element can be switched to the predetermined array pattern.
[0010]
Further, the audio apparatus of the present invention controls directivity by delay processing and
synthesizing an audio signal collected from a sound collection element functioning as a
microphone with a delay time set for each sound collection element. An input voice signal
processing means is provided, and a delay time pattern for each sound emitting element is stored
in the arrangement pattern in the pattern storage means, and the delay time pattern according to
the selected arrangement pattern is processed by the control means. It is characterized in that it
is set to the means.
[0011]
Further, the audio apparatus according to the present invention controls directivity by
performing amplitude processing and combining an audio signal collected from a sound
collection element functioning as a microphone at a signal level set for at least each sound
collection element. Input voice signal processing means for storing the signal level pattern of
each sound emitting element in the arrangement pattern in the pattern storage means and
storing the signal level pattern according to the selected arrangement pattern in the control
means; It is characterized in that it is set in the processing means.
[0012]
In these configurations, when setting the microphone array pattern described above, for each
audio signal collected by each microphone, the audio signal is subjected to delay processing or
amplitude with the delay time and signal level stored as one element of the array pattern. It is
processed.
Thus, the directivity of the sound signal to be collected is set by delay processing or amplitude
processing for each sound signal collected by each microphone.
[0013]
Further, the audio apparatus of the present invention controls directivity by delay processing and
synthesizing an audio signal emitted from the sound emitting element functioning as a speaker
with a delay time set for each sound emitting element. An output audio signal processing means
is provided, a delay time pattern for each sound emitting element is stored in an array pattern in
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the pattern storage means, and a delay time pattern corresponding to the selected array pattern
is output by the control means. It is characterized in that it is set to the means.
[0014]
Further, the audio device of the present invention controls directivity by processing the
amplitude of the audio signal emitted from the sound emitting element functioning as a speaker
at a signal level set for each sound emitting element and synthesizing the sound signal. An output
voice signal processing means is provided, and the pattern storage means stores the signal level
pattern of each sound emitting element in the arrangement pattern, and stores the signal level
pattern. The control means outputs the signal level pattern according to the selected
arrangement pattern. It is characterized in that it is set to the means.
[0015]
In these configurations, when setting the above-described speaker arrangement pattern, the
audio signal is subjected to delay processing or amplitude processing with the delay time and
signal level stored as one element of the arrangement pattern for each audio signal emitted from
each speaker Be done.
Thus, the directivity of the sound signal to be emitted is set by delay processing or amplitude
processing for each sound signal emitted from each speaker.
[0016]
Further, the audio apparatus of the present invention is characterized by including operation
input means for receiving an operation for selecting an array pattern, and selecting the array
pattern by the selection means according to the selection result inputted from the operation
input means.
[0017]
In this configuration, when an operation input for selecting an arrangement pattern according to
the frequency band of the audio signal required by the operation input unit is performed by the
speaker, the selection unit selects an arrangement pattern based on the operation input result.
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Then, the selected arrangement pattern is read out from the pattern storage means, and the
switching means is set by the control means to realize a desired arrangement pattern.
[0018]
The audio apparatus of the present invention further includes frequency band detection means
for detecting the frequency band of the audio signal collected by the sound collection element,
and the selection means arranges in accordance with the detection result input from the
frequency band detection means. It is characterized by selecting a pattern.
[0019]
In this configuration, the frequency band detection means detects the frequency band of the
audio signal collected by the sound collection element (sound collection element) functioning as a
microphone, and the arrangement pattern corresponding to the detected frequency band is the
selection means Is selected by
Then, the selected arrangement pattern is read out from the pattern storage means, and the
switching means is set by the control means to realize a desired arrangement pattern.
[0020]
According to the present invention, by varying the arrangement pattern of the sound collection
elements functioning as the microphone based on the frequency band (tone range) of the
collected sound signal, the sound consisting only of the low frequency band and the wide
frequency band Even if the sound composed of V changes dynamically, it is possible to realize an
optimal microphone array pattern for each range.
As a result, even when the sound range is dynamically changed, for example, when the speaker
uses this acoustic device to make a conversation or to listen to music when talking (interpropagation of audio signals) An acoustic device having optimum directivity according to each
sound range can be realized.
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[0021]
An acoustic device according to an embodiment of the present invention will be described with
reference to FIGS. 1 to 4.
FIG. 1 is a view showing the configuration of the speaker array of the audio apparatus according
to the present embodiment, where (a) is a front view and (b) is a plan view and a view showing a
speaker standing toward the speaker array.
[0022]
As shown in FIG. 1, the speaker array 1 is referred to as n speakers SM11 to SM1 n (hereinafter,
referred to as “speaker array row SM1”) arranged without any space in the horizontal
direction.
And n + 1 speakers SM21 to SM2 n + 1 (hereinafter referred to as “speaker array row SM2”).
And n speakers SM31 to SM3 n (hereinafter referred to as “speaker array row SM3”). And n +
1 speakers SM41 to SM4 n + 1 (hereinafter referred to as “speaker array row SM4”). )とから
なる。 When viewed from the speaker 200, the speakers in the speaker array 1 are arranged in
the order of the speakers SM11, SM12,..., SM1 n in the speaker array line SM1 in the horizontal
direction from the left to the right. In SM2, the order of the loudspeakers SM21, SM22, ..., SM2n
+ 1, in the loudspeaker arrangement line SM3 the order of the loudspeakers SM31, SM32, ...,
SM3n, in the loudspeaker arrangement line SM4, the order of loudspeakers SM41, SM42, ...,
SM4n + 1 Is arranged.
[0023]
Further, the speaker arrangement row SM1, the speaker arrangement row SM2, the speaker
arrangement row SM3, and the speaker arrangement row SM4 are arranged in this order (in the
order described) without spacing from the upper side to the lower side in the vertical direction.
Further, in the speaker array row SM1 and the speaker array row SM3, and the speaker array
row SM2 and the speaker array row SM4, the central positions of the speakers constituting each
row are shifted in the horizontal direction. In the example shown in FIG. 1, this amount of
deviation is 1/2 of the horizontal length of the basic speaker to be described later. That is, the
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speaker array 1 as a whole is arranged in the shape of each speaker.
[0024]
Here, all the loudspeakers except the loudspeakers SM21, SM2n + 1, SM4, and SM4n + 1 are
formed by electrostatic flat plate loudspeakers having a substantially square shape when viewed
from the front, and this is assumed to be a basic loudspeaker shape. On the other hand, the
speakers SM21, SM2n + 1, SM4, and SM4n + 1 are formed in a substantially rectangular shape
which is a half of the substantially square shape, that is, in a half size of a basic speaker shape.
The left end faces of the speakers SM11, SM21, SM31, and SM41 from the speaker 200 match in
the horizontal direction, and the right end faces of the speakers SM1n, SM2n + 1, SM3n, and
SM4n + 1 from the speaker 200 in the horizontal direction. The external shape of the entire
speaker array 1 is rectangular. The rectangular speaker array 1 is installed on the wall 100. Here,
each speaker SM corresponds to the "sound collecting element" of the present invention, and the
speaker array 1 corresponds to the "sound collecting element array" of the present invention.
[0025]
As the electrostatic flat plate speaker, for example, a diaphragm having an area of about 50 cm
<2> to 80 cm <2> is generally used, but conditions such as desired sound pressure, sound
quality, and sound range The area of the diaphragm is appropriately set by this.
[0026]
In the above description, an example in which the shape of the speaker SM in a front view is
substantially square or rectangular is described. However, the shape of the speaker SM is not
limited to this.
Furthermore, the shape of the speaker array is not limited to the rectangular shape as described
above, but may be partially different in width and the like.
[0027]
Further, in the above description, the interval between the speakers SM adjacent in the vertical
direction is set to 1⁄2 of the horizontal length of the speaker SM. However, the present invention
is not limited to this. May be
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8
[0028]
Such a speaker array 1 is incorporated in the acoustic device shown in FIG.
FIG. 2 is a block diagram showing a schematic configuration of the acoustic device of the present
embodiment. As shown in FIG. 2, the audio apparatus includes the speaker array 1 having the
above-described configuration, the switch SW connected to each speaker SM of the speaker array
1, and the speaker amplifier SA and the microphone connected to each switch SW. An amplifier
MA and an input audio signal processing unit 2 which receives an audio signal converted from
sound waves by a speaker SM functioning as a microphone and performs signal processing such
as delay processing (a delay processing) and amplitude processing (a gain processing); An output
audio signal processing unit 3 for performing predetermined signal processing such as delay
processing (delay processing) and amplitude processing (gain processing) on audio signals input
from other audio devices that are not And a switching control unit 4 that performs operation
control of the switch SW. Further, the audio device includes a controller 5 for controlling the
operation of the input voice signal processing unit 2, the output voice signal processing unit 3,
and the switching control unit 4, and an operation input unit such as a remote control for
receiving an operation from the outside by a speaker or the like. And 6.
[0029]
The switches SW11 to SW1n, SW21 to SW2n + 1, SW31 to SW3n, and SW41 to SW4n + 1 are
respectively connected one by one corresponding to the speakers SM11 to SM1n, SM21 to SM2n
+ 1, SM31 to SM3n, and SM41 to SM4n + 1 which constitute the speaker array 1 There is. The
switches SW11 to SW1n, SW21 to SW2n + 1, SW31 to SW3n, and SW41 to SW4n + 1 are
speaker amplifiers SA11 to SA1n, SA21 to SA2n + 1, SA31 to SA3n, SA41 to SA4n + 1, and
microphone amplifiers MA11 to MA1n, MA21 to MA2n + 1, MA31. To MA3n and MA41 to
MA4n + 1, respectively. Then, the switch SW connects the speaker SM to either the speaker
amplifier SA or the microphone amplifier MA according to the switching signal from the
switching control unit 4. Here, the switch SW and the switching control unit 4 correspond to the
"switching means" of the present invention.
[0030]
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9
The speaker amplifier SA amplifies the audio signal input from the output audio signal
processing unit 3 and outputs the amplified audio signal to the speaker SM functioning as a
speaker through the switch SW. The microphone amplifier MA is a low noise amplifier or the like,
amplifies an audio signal input from the speaker SM functioning as a microphone via the switch
SW, and outputs the amplified audio signal to the input audio signal processing unit 2.
[0031]
The input audio signal processing unit 2 inputs an audio signal amplified by the microphone
amplifier MA, performs different delay processing and amplitude processing for each
microphone amplifier MA, and outputs the processed signal to an external device (for example,
another acoustic device). . Thereby, predetermined directivity is given to the sound collected by
the speaker array 1. For example, the sound collected in the entire microphone function unit of
the speaker array 1 may be nondirectional, or the directivity of the sound collected in the entire
microphone function unit of the speaker array 1 may be strong in a specific direction. The input
audio signal processing unit 2 performs such signal processing such as delay processing and
amplitude processing based on an input directivity control signal input from the controller 5.
That is, in accordance with the input directivity control signal input from the controller 5, the
input audio signal processing unit 2 performs delay processing and amplitude processing for
each audio signal input from each of the microphone amplifiers MA.
[0032]
Thereby, a specific directivity can be formed by the plurality of speakers SM functioning as a
microphone arranged to collect an audio signal of a predetermined frequency band by the
controller 5 and the switching control unit 4 described later. For example, in the case of mainly
collecting the voice of the speaker, the voice signal from the microphones arranged in a pattern
that improves the sound collection characteristics in the low frequency band is subjected to
predetermined delay processing to direct the speaker toward the speaker. Can be enhanced.
Further, when music is mainly collected from the speaker side, predetermined delay processing is
performed on the audio signals from the microphones arranged in a pattern that improves the
sound collection characteristics of a wide frequency band including a high frequency band, The
directivity to the sound source on the speaker side can be enhanced. At this time, if the optimum
directivity can not be obtained only by the delay processing, the optimum directivity can be
realized by performing the amplitude processing of each audio signal together.
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[0033]
In addition, when only the low frequency band is taken in (collected), the number of speakers SM
functioning as a microphone decreases, and the processing capability of the input audio signal
processing unit has a margin, and the number of independently controllable channels can be
increased. .
[0034]
Furthermore, when capturing (collecting) only the high frequency band, the width of the entire
speaker array (microphone array) may be narrower than in the case of including the low
frequency band, so the speaker array can be independently controlled in multiple areas. It can be
divided and used.
[0035]
The output audio signal processing unit 3 is provided for each of the speaker amplifiers SA (as a
result, the speakers SM) with respect to audio signals to be output to the outside as sounds
(sound waves) input from an external device (for example, another acoustic device). Perform
delay processing and amplitude processing.
Thereby, predetermined directivity is given to the sound emitted from the speaker array 1.
For example, the sound emitted from the entire speaker function unit of the speaker array 1 may
be nondirectional, or the directivity of the sound emitted from the entire speaker function unit of
the speaker array 1 may be strong in a specific direction. The output audio signal processing unit
3 performs such signal processing such as delay processing and amplitude processing based on
the output directivity control signal input from the controller 5. That is, the output audio signal
processing unit 3 performs delay processing and amplitude processing for each audio signal
output to each speaker amplifier SA according to the output directivity control signal input from
the controller 5.
[0036]
Thereby, a specific directivity can be formed by the plurality of speakers SM functioning as
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speakers arranged to emit an audio signal of a predetermined frequency band by the controller 5
and the switching control unit 4 described later. For example, in the case of emitting a voice to a
speaker, directivity in the direction of the speaker can be obtained by performing predetermined
delay processing on voice signals to speakers arranged in a pattern that improves the noise
emission characteristics of the low frequency band. It can be enhanced. Further, when the music
is mainly emitted to the speaker, the speech signal to the speakers arranged in a pattern that
improves the sound emission characteristics of a wide frequency band including the high
frequency band is subjected to a predetermined delay process, It is possible to improve the
directionality to the elderly. At this time, as in the case of the above-mentioned collected sound
signal, if the optimum directivity can not be obtained only by the delay processing, the optimum
directivity can be obtained by combining the amplitude processing of each sound signal. It can be
realized.
[0037]
The switching control unit 4 causes the speaker SM to be connected to the speaker amplifier SA
for each of the switches SW based on the switching control signal input from the controller 5,
that is, to function as a speaker or to operate the speaker SM to the microphone amplifier MA. It
outputs a switching signal for switching whether to connect or function as a microphone.
[0038]
The controller 5 includes a storage device 50 in which a database as shown in FIG. 3 including a
mode of using an acoustic device and setting parameters corresponding thereto is stored.
[0039]
Further, the controller 5 detects the selected mode with reference to the database stored in the
storage device 50 based on the mode selected by the operation input unit 6, and reads the
setting parameter corresponding to this mode.
This controller 5 corresponds to the "selection means" and the "control means" of the present
invention.
[0040]
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FIG. 3 is a conceptual view of a database stored in the storage device 50. As shown in FIG.
The database is made up of a use mode of the sound device and parameters corresponding to the
use mode. The usage modes of the sound device include a "conversation" mode in which a human
voice is at the center of sound and a "performance" mode in which a sound of a performance
such as a musical instrument is at the center. The parameters include the arrangement pattern of
the speaker SM functioning as a speaker and the speaker SM functioning as a microphone, the
delay and gain for each speaker SM functioning as a speaker, the delay and gain for each speaker
SM functioning as a microphone, etc. is there. Then, these parameters are stored in association
with each mode.
[0041]
For example, in the "conversation" mode, a parameter for collecting and emitting an audio signal
in a low frequency band in a specific direction, that is, a directivity in a specific direction is
strong and only an audio signal in a low frequency band The parameters for emitting and
collecting sound are set. Further, in the case of the "performance" mode, parameters for
collecting and emitting sound signals in a wide frequency band including a high frequency band
are set.
[0042]
Then, the controller 5 controls the input directivity control signal, the output directivity control
signal, and the switching control for each of the input audio signal processing unit 2, the output
audio signal processing unit 3, and the switching control unit 4 according to the setting
parameter. Output a signal. That is, the delay and gain for each speaker SM functioning as a
microphone in the input audio signal processing unit 2, the delay and gain for each speaker SM
functioning as a speaker in the output audio signal processing unit 3, and a microphone for the
switching control unit 4 An arrangement pattern of the functioning speaker SM and the
loudspeaker SM functioning as the speaker is output.
[0043]
Specifically, by using the acoustic device having such a configuration, the following operation can
be performed.
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[0044]
(1) When the Conversation Mode is Selected When the conversation mode is selected by the
operation input unit 6, the selection result is transmitted to the controller 5.
The controller 5 reads out the selection result, that is, when the conversation mode is selected,
the parameter for collecting only the sound in the low frequency band according to the mode.
[0045]
FIG. 4A is a view showing an arrangement pattern of microphones (speakers) in the case of
collecting only the sound in the low frequency band. When only the sound in the low frequency
band is collected, as shown in FIG. 4A, the speakers at both ends in the horizontal direction,
which is the longitudinal direction of the predetermined line (the second line from the top in the
figure) of the speaker array 1 A speaker SM (for example, a speaker SM24 or a speaker SM2n−)
which is made to function as a microphone and has a predetermined pitch (every two speakers
SM in FIG. 4A) from the speakers SM21 and SM2n + 1 at both ends in this row. 2) also function
as a microphone. Then, the other speaker SM is made to function as a speaker.
[0046]
The controller 5 outputs a switching control signal having such a configuration of a microphone
and a speaker to the switching control unit 4.
[0047]
The switching control unit 4 responds to the input switching control signal to the switches
SW21, SW24,..., SW2n-2 and SW2n + 1, and the speakers SM21, SM24, ..., SM2n-2 and SM2n + 1
as microphone amplifiers MA21. , MA24,..., MA2n-2 and MA2n + 1 are output.
Thus, the speakers SM21, SM24,..., SM2n-2 and SM2n + 1 are connected to the input audio signal
processing unit 2 through the microphone amplifiers MA21, MA24,..., MA2n-2 and MA2n + 1,
respectively, as a microphone Function.
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[0048]
On the other hand, the switching control unit 4 outputs a switching signal for connecting the
speaker SM to the speaker amplifier SA to the switches SW other than the switches SW21,
SW24,..., SW2n-2 and SW2n + 1. As a result, the speakers SM except for the speakers SM21,
SM24,..., SM2n-2 and SM2n + 1 are connected to the output sound signal processing unit 3 via
the corresponding speaker amplifiers SA, and function as speakers.
[0049]
With such a configuration, the length of the array constituted by the arrayed microphones
becomes long, and the sound collection characteristics in the low frequency band are excellent.
In addition, since all the other speakers SM function as speakers, it is easy to obtain a
predetermined sound pressure. Furthermore, the directivity in the direction of the speaker can be
improved by performing delay processing and amplitude processing for each voice signal of each
microphone and speaker by the input voice signal processing unit 2 and the output voice signal
processing unit 3 as described above. .
[0050]
As a result, it is possible to configure an acoustic device that collects only low frequency band
sounds such as human voice from a specific direction with a microphone with low loss and high
efficiency, and emits a predetermined volume from a speaker in a specific direction. .
[0051]
(2) When the Performance Mode is Selected When the performance mode is selected by the
operation input unit 6, the selection result is transmitted to the controller 5.
The controller 5 reads out the selection result, that is, when the play mode is selected, the
parameter for collecting the sound of the wide frequency band according to the mode.
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[0052]
FIG. 4B is a diagram showing an arrangement pattern of microphones (speakers) in the case of
collecting sound in a wide frequency band. When sound in a wide frequency band is to be
collected, as shown in FIG. 4B, two predetermined rows (second and third rows from the top in
the figure) adjacent in the vertical direction of the speaker array 1 are used. The speakers SM21
to SM2n + 1 and the speakers SM31 to SM3n function as microphones. Then, the speakers SM11
to SM1 n and the speakers SM41 to SM4 n + 1 of the other rows function as the speakers.
[0053]
The controller 5 outputs a switching control signal having such a configuration of a microphone
and a speaker to the switching control unit 4.
[0054]
In response to the input switching control signal, the switching control unit 4 switches the
switches SW21 to SW2n + 1 and the switches SW31 to SW3n to the speakers SM21 to SM2n + 1
and the speakers SM31 to SM3n respectively. Output a switching control signal connected to
Thus, the speakers SM21 to SM2n + 1 and SM31 to SM3n are connected to the input audio
signal processing unit 2 through the microphone amplifiers MA21 to MA2n + 1 and MA31 to
MA3n + 1, respectively, and function as microphones.
[0055]
On the other hand, the switching control unit 4 outputs, to the switches SW11 to SW1n and
SW41 to SW4n + 1, switching control signals in which the speakers SM11 to SM1n and SM41 to
SM4n + 1 connect to the speaker amplifiers SA11 to SA1n and SA41 to SA4n + 1. Thus, the
speakers SM11 to SM1n and SM41 to SM4n + 1 are connected to the output sound signal
processing unit 3 via the corresponding speaker amplifiers SA11 to SA1n and SA41 to SA4n + 1,
and function as speakers.
[0056]
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With such a configuration, the distance between the arranged microphones becomes short, the
sound collection characteristic of the sound in the high frequency band is improved, and the
sound collection characteristic in the wide frequency band is excellent. Furthermore, the
directivity in the specific direction can be improved by performing delay processing and
amplitude processing for each audio signal of each microphone and speaker by the input audio
signal processing unit 2 and the output audio signal processing unit 3 as described above.
[0057]
As a result, it is possible to configure an acoustic device in which the sound of a wide frequency
band such as the sound of a musical instrument from a specific direction is collected with low
loss by the microphone and the predetermined volume is emitted from the speaker in the specific
direction.
[0058]
In addition to these two modes, it is possible to set a two-party call mode as shown in FIG. 3 and
other modes, and according to each setting, the speaker and microphone by the speaker SM as
described above. Can be easily configured, and sound collection characteristics and sound
emission characteristics can be obtained according to each.
[0059]
For example, in the “two-party call” mode, when there are two speakers separated by a
predetermined distance in the lateral direction in front of the speaker array of the present
embodiment, the speaker array is functionally divided into two horizontally.
Then, an array of microphones constituting the above-mentioned "conversation" mode is formed
by each of the two divided speaker arrays, and delay processing and amplitude processing of an
audio signal collected by the microphones are performed.
Thereby, strong directivity can be formed independently by both of the two speakers, and it can
be suppressed that sounds emitted from each other interfere with each other's calls.
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[0060]
With the above configuration, an optimal microphone and speaker arrangement pattern is
configured according to the mode used, that is, the required sound range (frequency band), and
the necessary directivity is formed. An acoustic device having excellent sound collection
characteristics and sound emission characteristics can be realized.
[0061]
Moreover, since the switching of the above-mentioned mode can be dynamically switched by the
operation of the operation input unit, even if the above-mentioned mode is dynamically switched,
according to it, the mode is switched using the operation input unit According to the
arrangement pattern and directivity of the optimal microphone and speaker can be configured.
As a result, it is possible to realize an acoustic device having sound collection characteristics and
sound emission characteristics that are always optimal even in an environment where the sound
range dynamically changes.
[0062]
Furthermore, by setting and storing the arrangement pattern of the speaker and the microphone
in advance, the necessary arrangement pattern and directivity can be realized easily and
immediately according to the mode input by the operation input unit. .
[0063]
In the above description, the mode, that is, the arrangement pattern of the speaker and the
microphone is determined by operation input of the mode by the operation input unit, but a
frequency detection unit that analyzes the frequency spectrum of the input sound is used. By
including, it is possible to realize optimal sound collection characteristics and sound emission
characteristics without the operation of the speaker such as operating the operation input unit.
[0064]
In this case, first, the arrangement pattern of the speaker and the microphone is collected as a
pattern corresponding to the sound in the wide frequency band.
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Then, the frequency spectrum of the sound collected by the frequency detection unit is analyzed,
and if it is detected that the sound is in a wide frequency band, the arrangement pattern as it is is
maintained.
On the other hand, if it is detected from the frequency spectrum that only the sound in the low
frequency band is detected, the arrangement pattern is changed to an optimal sound collection
characteristic and sound emission characteristic for the low frequency band. Further, by
detecting the delay relationship between the collected audio signals, the incoming direction of
the audio signals can be detected. This can also be used to form a predetermined directivity.
[0065]
The figure which shows the structure of the speaker array of the audio apparatus based on
embodiment of this invention The block diagram which shows schematic structure of the audio
apparatus of embodiment of this invention The conceptual diagram of the database memorize |
stored in the memory apparatus 50 Only the sound of a low frequency band A diagram showing
an arrangement pattern of speakers (microphones) in the case of collecting sound and a diagram
showing an arrangement pattern of speakers (microphones) in the case of collecting sound in a
wide frequency band
Explanation of sign
[0066]
1-speaker array 2-input voice signal processing unit 3-output voice signal processing unit 4switching control unit 5-controller 50-storage device 6-operation input unit 100-wall 200speaker SM-speaker SW-switch SA- Speaker amplifier MA-Microphone amplifier
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