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JP2006279298

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DESCRIPTION JP2006279298
PROBLEM TO BE SOLVED: To independently collect voices emitted by each person and to freely
control a place where the voices are clearly heard. A microphone array and a speaker array are
respectively embedded in four side wall surfaces of a floor, and two persons moving in the floor
carry a transmitter to detect the location of each person as needed. Then, the drive of the
microphone array and the speaker array is controlled so that the sound emitted by one person
can be clearly heard only at the location of the other person. [Selected figure] Figure 1
Acoustic beam control system
[0001]
The present invention relates to a technique for controlling directivity when collecting and
emitting sound.
[0002]
Loudspeaker arrays that allow control of the acoustic beam are widespread.
An acoustic beam means a group of a plurality of sound waves having the same waveform whose
phase is adjusted to give directivity in a certain direction. Many of the speaker arrays include a
plurality of speaker units arranged in a row and delay elements for individually delaying the
phases of audio signals supplied to the respective speaker units.
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[0003]
If it is desired to have directivity in the rightward direction when viewed from the front, the delay
element of the speaker array supplies the phase of the audio signal supplied to the speaker unit
disposed on the left to the speaker unit disposed on the right. Delay the phase of the audio signal
to be Thereby, the sound waves emitted from the respective speaker units are added in the same
phase at a predetermined position in a direction toward the right when viewed from the front,
and the sound pressure at the predetermined position is locally increased. That is, the directivity
of the voice moves from the front to the right. If it is desired to move the directivity of the voice
in the direction from the left, the opposite control is performed. Patent documents 1 etc. are
mentioned as a document which indicated this kind of technology.
[0004]
In addition, a system has been proposed in which it is possible to freely control the place where
each person's voice is clearly heard by combining the above-mentioned speaker array and a
plurality of microphones, and is used for applications such as conference support. It is done. In
this system, voices collected by a microphone unique to each person are respectively output as
acoustic beams having directivity at positions different from the sources of the voices. In this
way, it is possible to make the speech of one person clearly heard only by a specific person in
another place. Japanese Patent Application Laid-Open No. 7-22878
[0005]
However, in the system of the above-mentioned type, there is a disadvantage that as many
microphones as generation sources have to be prepared as means for collecting each voice
individually for each generation source. The present invention has been devised under such a
background, and even without preparing a microphone for each person who is a source of sound
generation, the sound emitted by each person is collected separately, and An object of the
present invention is to provide a system that can freely control the place where the voices are
clearly heard.
[0006]
An acoustic beam control system according to a preferred embodiment of the present invention
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comprises a plurality of microphones arranged in a row, each outputting a collected sound as an
audio signal, and a row of sound signals provided to each of the microphones. (A) a plurality of
speakers for emitting sound as sound, and a sound collection focal position which is a position
for emphasizing sound collected by each of the microphones, and a position for enhancing sound
pressure of sound emitted from each of the speakers Focus position specifying means for
specifying a sound emission focus position; sound collection for performing individual signal
processing on each of the sound signals output from the respective microphones in order to
emphasize the sound collected from the sound collection focus position Signal processing means,
mixing means for mixing the audio signal subjected to the signal processing by the sound
collection signal processing means, and the number of loudspeakers for the mixed audio signal
Separate signal processing means and separate signal processing is performed on each of the
audio signals separated by the signal separation means in order to increase the sound pressure
of the sound at the sound emission focal point position. And sound emission signal processing
means for supplying an audio signal to each of the speakers.
[0007]
In this aspect, the image pickup apparatus further comprises detection means for detecting the
respective positions of a plurality of persons, and the focus position specifying means specifies
the first position detected by the detection means as the sound collection focus position. A
second location different from the first location may be specified as the sound emission focal
point.
[0008]
The image processing apparatus further includes a detection unit that detects the location of a
person, and the focus position specifying unit specifies the location detected by the detection unit
as the sound collection focus position and also specifies the sound emission focus position. You
may
[0009]
According to the present invention, it is possible to separately collect the voices emitted by each
person and to freely control the place where the voices are clearly heard.
[0010]
(Embodiments of the Invention) Embodiments of the present invention will be described.
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The acoustic beam control system according to the present embodiment has the following two
features.
The first feature is that the microphone array and the speaker array are respectively embedded
in the four side wall surfaces of the floor that accommodates a person inside.
The second feature is that two people moving on the floor carry a transmitter to detect the
location of each person as needed, and the voice emitted by one person is clear only at the
location of the other person The drive of the microphone array and the speaker array is
controlled to be listened to.
In the following description, of the two persons who carry the transmitter, the person who utters
a voice is referred to as a "speaker", and the person who listens to a voice is referred to as a
"listener."
[0011]
FIG. 1 is a block diagram showing a schematic hardware configuration of an acoustic beam
control system according to the present embodiment. This system includes a microphone array
11, a sound collection signal processing unit 12, a mixing unit 13, a signal separation unit 14, a
sound emission signal processing unit 15, a speaker array 16, a transmitter 17, a location
detection unit 18, and a focal position identification unit 19 is provided. In this figure, the
microphone array 11, the sound collection signal processing unit 12, the mixing unit 13, the
signal separation unit 14, the sound emission signal processing unit 15, and the speaker array
16 individually separate the sound processing systems 20 corresponding to the four side walls. It
is formed in.
[0012]
As shown in FIG. 2, each pair of the microphone array 11 and the speaker array 16 in each
sound processing system 20 is embedded in four side walls so as to surround the inside of the
floor. Then, six microphone units 21 are arranged in the microphone array 11 and six speaker
units 22 are arranged in a row in the speaker array 16.
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[0013]
Each of the microphone units 21 arranged in a row outputs the sound collected by itself to the
sound collection signal processing unit 12 as a sound signal. The sound collection signal
processing unit 12 performs individual delay signal processing on each of the audio signals
output from each of the microphone units 21 and then supplies the processed signal to the
mixing unit 13. By mixing the audio signals subjected to the delay signal processing by the sound
collection signal processing unit 12 by the mixing unit 13, it is possible to locally emphasize the
audio that has reached the microphone unit 21 from any direction. This principle will be
described with reference to FIG.
[0014]
In FIG. 3, in order to simplify the description, two microphone units 21a and 21b connected to
the sound collection signal processing unit 12 are assumed. The directivity of the microphone
units 21a and 21b shown in this figure is the direction substantially orthogonal to the straight
line X connecting them, that is, the sharpest with respect to the direction directly in front of the
microphone unit 21a. If the voice signals of the voices arriving to b and b are mixed as they are,
as a result of the waveforms represented by the voice signals being added in the same phase, a
locally emphasized voice can be obtained. On the other hand, when the direction in which the
voice arrives shifts to the left or right, a time difference occurs in the timing at which the
microphone units 21a and 21b are reached, so the same result can not be obtained.
[0015]
Here, it is assumed that the voice coming to the microphone units 21a and 21b from a direction
shifted to the left by θ from the front. Between the timing when the voice reaches the
microphone units 21a and b, the time difference for the sound wave to travel the distance L
which is the difference between the path length to the left microphone unit 21a and the path
length to the right microphone unit 21b t occurs. Therefore, even if the audio signals of the
sounds collected by both the microphone units 21a and 21b are mixed as they are, those audio
signals can not be added in the same phase.
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[0016]
In this case, delay signal processing is performed such that the phase of the audio signal output
from the microphone unit 21a on the left side is delayed by the time difference t. Then, the audio
signals output from both of the microphone units 21a and 21b are mixed in the same phase, and
a locally emphasized audio can be obtained as if it came from the direction directly in front. The
principle is the same even in the case where three or more microphone units 21 arranged in a
row extend, and if the amount of delay is gradually reduced from the sound signal output from
the microphone unit 21 farthest from the sound source Good.
[0017]
In this system, the sound collection signal processing unit 12 is in charge of the function of
delaying the phase of the sound signal outputted by each microphone unit 21 of the microphone
array 11 in a stepwise manner. The amount of delay given by the unit 12 to each of the sound
signals is determined by a parameter generated by the focus position specifying unit 19
described later.
[0018]
In FIG. 1, the signal separation unit 14 separates the audio signal input from the mixing unit 13
into six audio signals having the same waveform content, and then inputs the audio signal to the
sound emission signal processing unit 15.
The sound emission signal processing unit 15 performs individual delay signal processing on
each of the six audio signals separated by the signal separation unit 14. Each of the audio signals
subjected to the delay signal processing is supplied to each speaker unit 22 and emitted from
each speaker unit 22 as an audio. By supplying an audio signal subjected to delayed signal
processing by the sound emission signal processing unit 15 to each speaker unit 22, locally
increasing the sound pressure of the sound emitted from each speaker unit 22 at an arbitrary
position it can. This principle will be described with reference to FIGS. 4 and 5.
[0019]
In FIGS. 4 and 5, three speaker units 22 a to 22 c connected to the sound collection signal
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processing unit 12 are assumed to simplify the description. As shown in FIG. 4, assuming that
sound waves having the same waveform are simultaneously emitted from arbitrary three sound
sources Z on the spherical surface of radius r centered at position P, the sound waves are added
in the same phase at position P Therefore, the sound pressure is locally increased. On the other
hand, as shown in FIG. 5, since the positions of the three speaker units 22a to 22c are fixed in a
row in the speaker array 16, the position P and the speaker units 22a to 22c have such an ideal
positional relationship. There is no need to take it.
[0020]
In this case, the path length from each of the speaker units 22a to 22c to the position P is
determined, and the largest path is for the audio signal supplied to the two speaker units 22b
and c excluding the speaker unit 22a having the largest path length. The delay signal processing
is performed such that the phase is delayed by the time t required for the sound wave to travel
the distance L which is the difference with the length r. Then, as a result of the sound waves
emitted from the speaker units 22a to 22c being added in the same phase at the position P, the
sound pressure at the position P is locally increased. The principle is the same even in the case
where four or more loudspeaker units 22 are arranged in a row, and the amount of delay can be
gradually reduced from the audio signal supplied to the loudspeaker unit 22 closest to the target
position. Just do it.
[0021]
In this system, the sound emission signal processing unit 15 is in charge of a function to delay
the phase of the sound signal supplied to the speaker unit 22 in stages, and the sound emission
signal processing unit 15 controls each sound. The amount of delay given to the signal is
determined by a parameter generated by the focus position specifying unit 19 described later. In
FIG. 1, the location detection unit 18 performs wireless communication with the transmitter 17
to detect the locations of the speaker and the listener on the floor, and each detected location is
used as coordinate information. The information is supplied to the focus position specifying unit
19.
[0022]
The focus position specifying unit 19 is a parameter that determines the content of the delay
signal processing to be executed by the sound collection signal processing unit 12 and the sound
emission signal processing unit 15 in each sound processing system 20 with the assistance of the
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location detection unit 18. The generated and generated parameters are sequentially supplied to
the respective units.
[0023]
The behavior of the focus position specifying unit 19 will be described in detail.
FIG. 6 is a flowchart showing the behavior of the focus position specifying unit 19. A series of
processes shown in the figure are executed each time coordinate information is supplied from
the location detection unit 18. When coordinate information is supplied, the focal position
specifying unit 19 specifies one of the four acoustic processing systems 20 as a parameter
supply target (S100).
[0024]
Next, the focus position specifying unit 19 specifies the position of the speaker indicated by the
coordinate information supplied from the position detection unit 18 as a sound collection focus
position (S110). The sound collection focus position means a position to emphasize the sound
collected by each microphone unit 21 of the sound processing system 20 specified in step 100.
The focus position specifying unit 19 generates and generates a parameter for each microphone
unit 21 representing a delay amount such that the sound collected from a certain direction of the
sound collection focus position specified in step 110 is locally emphasized. The parameter is
supplied to the sound collection signal processing unit 12 of the sound processing system 20
specified in step 100 (S120).
[0025]
The focus position specifying unit 19 that supplies the parameter to the sound collection signal
processing unit 12 specifies the location of the listener indicated by the coordinate information
supplied from the position detection unit 18 as the sound emission focus position (S130). The
sound emission focal position means a position that increases the sound pressure of the sound
emitted from each speaker unit 22 of the sound processing system 20 specified in step 100. The
focal position specifying unit 19 generates a parameter for each microphone unit 21 respectively
representing an amount of delay such that the sound pressure of the sound locally increases at
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the sound emission focal position specified in step 140, and generates the generated parameter
It is supplied to the sound emission signal processing unit 15 of the sound processing system 20
specified at 100 (S140).
[0026]
The focus position specifying unit 19 which has supplied the parameters to the sound emission
signal processing unit 15 determines whether all of the acoustic processing systems 20
respectively corresponding to the four wall surfaces have been specified as the parameter supply
targets (S150). If there are sound processing systems 20 not to be supplied, the process returns
to step 100, another sound processing system 20 is specified, and the subsequent processing is
repeated. On the other hand, when all the sound processing systems 20 have been specified as a
supply target, the processing is once ended, and it is waited for new location information to be
supplied from the location detection unit 18.
[0027]
In the present embodiment described above, the locations of the speaker and the speaker within
the floor in which the microphone array 11 and the speaker array 16 are embedded are detected
as needed. Then, the drive of the microphone array 11 is controlled so that only the voice
emitted at the location of the speaker is emphasized and collected, and the collected voice is
clearly heard only at the location of the listener To control the drive of the speaker array 16.
Therefore, even if another person who can be a sound source and a sound source is on the floor,
only the listener can clearly hear the voice uttered by the speaker.
[0028]
(Other Embodiments) The present invention can be modified in various ways. In the above
embodiment, the microphone array 11 is configured by six microphone units 21. However, the
microphone array 11 may be configured by arranging an arbitrary number of microphone units
21 different from this in a line. Similar modifications are possible for the speaker array 16. In the
above embodiment, the position of the speaker is specified as the sound collection focal position,
and the position of the listener is specified as the sound emission focal position, and the speaker
and the listener on the floor are identified. The relationship was static. On the other hand, instead
of performing such one-way control, it may be possible to perform double-sided control such that
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each person's voice can be heard by another person. . According to this modification, on the floor
accommodating a relatively large number of persons, it is also possible to realize a secret voice
call between two persons at distant places.
[0029]
In the above embodiment, the locations of the speaker and listener who are different persons are
respectively identified as the sound collecting focal point position and the sound emitting focal
point position, but the sound collecting focal point position and the sound emitting focal point
The sound focus position may be superimposed. According to this configuration, only the voice of
a person on the floor can be clearly heard by the person himself, so that it can be used as a
support tool for chorus practice as described below. That is, in this modification, the transmitter
17 is carried by one of the singers participating in the chorus practice to detect the location.
Then, while emphasizing the sound collected by each of the microphone units 21 from the
direction of the detected location, control is performed to cause each speaker unit 22 to emit a
sound whose sound pressure is increased at the location. Thus, a singer who carries the
transmitter 17 can clearly listen to only his own singing sound without being confused by the
voices of other singers who are singing together.
[0030]
It is a hardware schematic block diagram of an acoustic beam control system. It is a figure which
shows the installation aspect of a microphone array and a speaker array. It is a figure which
shows the principle which controls the directivity of a microphone. It is a figure which shows the
principle which controls the directivity of a speaker. It is a figure which shows the principle
which controls the directivity of a speaker. It is a flowchart which shows the behavior of a focus
position specification part.
Explanation of sign
[0031]
11 Microphone array 12 Sound collection signal processing unit 13 Mixing unit 14 Signal
separation unit 15 Sound emission signal processing unit 16 Speaker array 17 Transmitter 18
Location detection unit 19 ... Focal point position identification unit, 20 ... Sound processing
system, 21 ... Microphone unit, 22 ... Speaker unit
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