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JP2008042656

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DESCRIPTION JP2008042656
The present invention provides a listening position specifying method and a listening position
specifying system capable of emitting measurement sound whose volume level is adjusted
according to the surrounding environmental sound without giving a user a sense of discomfort.
In an audio system (1), before a sound for measurement for specifying a listening position is
emitted from speaker units (SP1, SPn) of a speaker array device (3), a microphone MIC (31) of a
remote control device (5) installed at the listening position The background noise is collected and
its volume level is measured, and the volume level of the audio for measurement is set based on
the volume level of the background noise. Then, the arrival time until the microphone MIC31
picks up the measurement audio emitted from the two speaker units SP1 and SPn by the
microphone MIC31 and the measurement audio emitted from the two speakers SP1 and SPn
Calculate the listening position based on [Selected figure] Figure 1
Listening position specifying system and listening position specifying method
[0001]
The present invention relates to a listening position specifying system and a listening position
specifying method for collecting a measurement sound emitted from a speaker unit by a
microphone and measuring a listening position of a listener using an arrival time of the
measurement sound. .
[0002]
Conventionally, audio devices (multi-channel audio systems) that output multi-channel audio,
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1
speaker array devices, and the like that output audio at a volume or delay time according to the
listener's listening position from a plurality of speaker units are known. .
For example, in the case of a multi-channel audio system, a plurality of speaker units are
arranged around the listener, and the volume level and delay time of the sound emitted from
each speaker unit are adjusted to the surroundings of the listener. Form a sound field. Also, in the
case of a speaker array device, a plurality of sound beams are formed by adjusting the timing and
volume level at which sound is output from each speaker unit of a plurality of speaker units
arranged in a matrix on the panel board. A sound field is formed around a listener by a sound
beam reflected on a wall or the like or a sound beam emitted directly. In these devices, the
volume level and output timing (delay time) of the audio signal of each channel are balanced so
that the listener feels that the sound field is enveloped at the listening position, with only a
specific channel protruding. It is adjusted well.
[0003]
In the audio device and the speaker array device, in order to adjust the volume level and the
output timing as described above, it is necessary to obtain the listening position in advance.
Therefore, conventionally, there has been proposed a sound quality adjustment device that
automatically detects the listening position of a listener (see, for example, Patent Document 1).
Unexamined-Japanese-Patent No. 4-370000
[0004]
The sound quality adjustment apparatus described in Patent Document 1 includes two speaker
units for L channel and R channel and a microphone. At the time of measurement of the listening
position, the microphone is arranged in advance at the listening position, the measurement sound
is emitted sequentially from the two speaker units, and the measurement sound is collected by
the microphone. The sound quality adjustment device measures the time until the measurement
sound reaches the microphone from each of the two speaker units, and calculates the distance
from the speaker unit to the microphone (listening position) based on this measurement time.
[0005]
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2
In the above-described conventional sound quality adjustment apparatus, the volume level of the
measurement sound is always set to a high level in order to be able to detect the listening
position reliably even under a certain amount of noise. However, when the volume level of the
measurement audio is set to a high level in this way, when measurement is performed in an
environment where the background noise level is low or the environment where the
reverberation level is high, the measurement audio is higher than necessary. As a result, there is
a problem that the listener is uncomfortable.
[0006]
Therefore, the present invention provides a listening position specifying system and a listening
position specifying method capable of emitting measurement sound whose volume level is
adjusted according to the surrounding environmental sound without giving the user a sense of
discomfort. The purpose is
[0007]
The present invention has the following configuration as means for solving the above-mentioned
problems.
[0008]
(1) A microphone installed at a listening position for listening to voices emitted from a plurality
of speaker units and transmitting a detection notification signal when the microphone picks up
the measurement voice and the microphone picks up the measurement voice A measurement
terminal device including a first communication unit, a plurality of speaker units, a control unit
for emitting sound for measurement sequentially from at least two speaker units among the
plurality of speaker units, and the detection notification A second communication unit for
receiving a signal, and an operation for calculating the listening position based on an arrival time
until the second communication unit receives a detection notification signal after emitting
measurement sound from each of the speaker units And a voice output device comprising: a
voice output device comprising: a measuring terminal device for measuring the background noise
collected by the microphone; The first communication unit may output a volume level of
background noise detected by the signal level detection unit, and the control unit may output the
volume level of the background noise based on the volume level of the background noise. The
volume level of the measurement voice is set.
[0009]
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In this configuration, before the measurement sound for identifying the listening position is
emitted, the background noise is picked up by the microphone installed at the listening position
and the volume level is measured to obtain the volume level of the background noise. Setting the
volume level of the measurement audio, emitting the measurement audio sequentially from the
two speaker units, and calculating the listening position based on the arrival time until the
detection notification signal is received.
Therefore, by setting it to a low volume level that can be reliably picked up by the microphone
without being mixed with background noise and does not cause the listener to feel
uncomfortable, an appropriate volume matched to the environmental sound around the listening
position The level measurement voice enables identification of the listening position.
[0010]
(2) The voice output device includes a timing unit that counts the arrival time and a
predetermined time, and the control unit causes the second communication unit to detect the
detection notification signal even if the timing unit measures a predetermined time. When not
receiving the sound, the volume level of the measurement sound is increased by a fixed amount,
and the two speaker units are made to emit sound.
[0011]
If the listening position is in an unexpected position or in an unexpected environment, the
measurement audio will be in spite of setting the volume level of the measurement audio based
on the volume level of ambient background noise. It is an error because it can not be picked up
by the microphone mixed with background noise.
In this configuration, when the second communication unit does not receive the detection
notification signal even after a predetermined time has elapsed, the measurement voice can not
be collected, and therefore, until the measurement voice can be collected, The sound volume level
of the measurement audio is increased by a fixed amount each time at a constant time, and the
collection of the measurement audio is repeated.
Therefore, instead of setting the measurement audio to a large volume level in advance, the
volume level of the measurement audio is gradually increased and set to a volume level that can
be picked up by the microphone, giving the listener an unpleasant feeling. You can set the
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4
volume level of the measurement audio.
[0012]
(3) The control unit is characterized in that the volume level of the measurement voice is
returned to an initial value when a first time period elapses after the volume level of the
measurement voice is increased.
[0013]
In this configuration, when the level change procedure is not performed for the first time or
more, the volume level of the measurement audio is returned to the initial value.
Therefore, even if the listener moves for a while after specifying the listening position and the
listening position has changed or the background noise level has changed, the volume level of
the measurement audio will increase after the first time period. As the initial value is restored,
the volume level of the measurement audio decreases, and the viewer does not feel
uncomfortable.
[0014]
(4) The control unit sets the detection threshold of the measurement sound based on the volume
level of the background noise.
[0015]
In the listening position identification system, the volume level of the measurement voice is set
based on the volume level of background noise, but it may not be possible to detect the
measurement voice if the detection threshold of the measurement voice is a fixed value.
In this configuration, the control unit sets a detection threshold for detecting the measurement
voice based on the background noise volume level.
Therefore, by changing the detection threshold value for detecting the measurement voice
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5
according to the volume level of the background noise, it is possible to reliably detect the
measurement voice regardless of the volume level of the background noise.
[0016]
(5) A storage unit for storing the reverberation level measured in advance in the indoor space in
which the audio output device is installed, the control unit is configured to release the
measurement audio based on the reverberation level stored by the storage unit. It is
characterized by setting a sound time.
[0017]
Human hearing sense is integrated not only by the sound level but also by the duration to
recognize the entire volume level, so even if the sound volume level is the same, the higher the
reverberation level in the indoor space is, the longer the reverberation time, the more I feel that
the volume level is high.
In this configuration, based on the reverberation level of the indoor space in which the audio
output device is installed, the emission time of each measurement audio to be emitted
sequentially from the two speaker units of the audio output device is set. Therefore, as the
reverberation level of the indoor space in which the audio output device is installed is higher, the
sound volume time of the listener is felt by shortening the emission time of each measurement
sound to be emitted sequentially from the two speaker units of the audio output device. As a
result, it is possible to specify the listening position without giving the listener an unpleasant
feeling.
[0018]
(6) The control unit is characterized by setting an emission interval of each of the measurement
voices to be emitted sequentially from the two speaker units of the audio output device based on
the reverberation level stored in the storage unit. .
[0019]
The voice output device emits the measurement voice sequentially from the two speaker units,
but the higher the reverberation level of the indoor space where the voice output device is
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6
installed, the longer the reverberation time of the measurement voice, so the two measurement
voices If the interval for emitting the sound is short, in some cases, two measurement voices may
be connected, and the measurement voice may be erroneously detected to misidentify the
listening position.
In this configuration, on the basis of the reverberation level of the indoor space in which the
audio output device is installed, the sound emission interval of each of the measurement sound
emitted from the two speaker units is set. Therefore, as the reverberation level of the indoor
space in which the audio output device is installed is higher, the sound emission interval time of
each measurement sound emitted from the two speaker units is extended to prevent the two
measurement sounds from being connected. Since the two measurement voices can be reliably
collected, the listening position can be identified with certainty.
[0020]
(7) A procedure for collecting background noise with a microphone installed at a listening
position for listening to voices emitted from a plurality of speaker units and detecting the volume
level of the background noise, based on the volume level of the background noise Setting the
volume level of the measurement audio, an emission procedure for emitting the measurement
audio of the volume level from at least two speaker units of the plurality of speaker units,
collecting each measurement audio with the microphone Sound collection procedure, and a
procedure for calculating a listening position based on both arrival times from when the two
speaker units emit each measurement voice to when the microphone picks up the sound. Do.
[0021]
In this configuration, before the measurement sound for calculating the listening position is
emitted, the background noise is collected by the microphone installed at the listening position
and the volume level is measured, and based on the volume level of the background noise. Set the
volume level of the measurement audio.
Then, the measurement voices emitted from at least two speaker units among the plurality of
speaker units are collected by the microphone, and both arrival times until the microphone picks
up the measurement voices emitted from each speaker unit Calculate the listening position based
on Therefore, by setting it to a low volume level that can be reliably picked up by the microphone
without being mixed with background noise and does not cause the listener to feel
uncomfortable, an appropriate volume matched to the environmental sound around the listening
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position The level measurement voice enables identification of the listening position.
[0022]
According to the present invention, before emitting the measurement voice for specifying the
listening position, the background noise is collected by the microphone installed at the listening
position and the volume level is measured, and the volume level of the background noise is
determined. Set the volume level of the measurement audio based on. Then, the measurement
voices emitted from the two speaker units are collected by the microphone, and the listening
position is calculated based on the arrival time until the microphone picks up the measurement
voices emitted from the two speaker units. Do. As a result, the measurement voice can be reliably
collected by the microphone without being mixed with background noise, and the volume level of
the measurement voice can be set to a low volume level that does not give a sense of discomfort
to the listener. It becomes possible to identify the listening position by measuring sound of the
appropriate volume level matched to the environmental sound around the listening position.
[0023]
FIG. 1 is a block diagram showing a schematic configuration of an audio system. The audio
system 1 which is a listening position specifying system includes a speaker array device 3 and a
remote control device 5 which is a measurement terminal device.
[0024]
The speaker array device 3 includes an input unit 11, a signal processing unit (decoder) 12, a
beam forming unit 13, n D / A converters 15 (15-1 to 15-n), and n amplifiers 17 (17-1). To 17-n)
and speaker units SP1 to SPn. The speaker array device 3 further includes an IR signal receiving
unit 21, a system control unit 23, an operation unit 25, a display unit 27, and a storage unit 29.
The system control unit 23 also includes a measurement voice processing unit 231 and a
position detection processing unit 233. The position detection processing unit 233 further
includes a clock unit 235, a time storage unit 237, and an operation unit 239.
[0025]
The remote control device 5 includes a microphone MIC 31, an amplifier 33, an A / D converter
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8
35, a signal level detection unit 37, a display unit 39, an operation unit 41, a control unit 43, and
an IR code sending unit 45.
[0026]
In the speaker array device 3, the input unit 11 is an interface circuit of a surround sound signal
output from an external device (not shown), and the surround sound signal input from the
external input terminal 111 passes through the signal processing unit 12. The signal is decoded
and post-processed, and output to the beam forming unit 13.
[0027]
The signal processing unit (decoder) 12 includes a measurement sound generation unit 121,
generates a test sound signal that is measurement sound based on the control signal from the
system control unit 23, and outputs the test sound signal to the beam forming unit 13. Do.
[0028]
The beam forming unit 13 generates an audio beam from the surround sound signal sent from
the input unit 11 so that the listener can optimally listen to the surround sound at the listening
position, and each D / A converter 15-1 Output to 15-n.
The beam forming unit 13 forms an audio beam of each channel based on the delay control value
(listening position information) output from the system control unit 23.
Further, when the beam forming unit 13 receives a control signal for emitting the measurement
voice 1 or 2 from the system control unit 23, the test voice signal output from the measurement
voice generation unit 121 of the signal processing unit 12 Are output to the D / A converter 15-1
or the D / A converter 15-n.
As this test voice signal, for example, a sine wave signal or an impulse signal may be used.
[0029]
The D / A converters 15-1 to 15-n convert digital audio signals output from the beam forming
unit 13 into analog audio signals and output the analog audio signals to the amplifiers 17-1 to
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17-n.
[0030]
The amplifiers 17-1 to 17-n amplify analog audio signals output from the D / A converters 15-1
to 15-n, and output the amplified signals to the speaker units SP1 to SPn of the speaker array 19.
[0031]
The speaker array 19 converts the surround sound signal amplified by the amplifiers 17-1 to 17n into sound and emits the sound.
[0032]
When receiving the IR signal (infrared light signal) output from the remote control device 5, the
IR signal reception unit 21 converts the IR signal into an electric signal and outputs the electric
signal to the system control unit 23.
[0033]
The system control unit 23 switches the input of the speaker array device 3 and causes the beam
forming unit 13 to output the test sound data from the measurement sound generation unit 121.
[0034]
At this time, the measurement audio processing unit 231 measures the volume level of the
measurement audio 1 and 2 based on the volume level (IR code) of the background noise
measured by the remote control device 5. Set to
[0035]
Further, the position detection processing unit 233 transmits that the measurement voices 1 and
2 are emitted from the speaker units SP1 and SPn of the speaker array 19, and then transmits
that the remote control device 5 has collected the measurement voices 1 and 2. The arrival time
t1 · t2 until the IR code sent out is received is timed by the timer unit 235, and the time storage
unit 237 stores this t1 · t2.
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The arithmetic unit 239 calculates the position (listening position) of the remote control device 5
based on the arrival times t1 and t2, and outputs the listening position information to the beam
forming unit 13.
[0036]
The operation unit 25 is for the user to perform an operation to control the operation of the
speaker array device 3.
[0037]
The display unit 27 displays messages such as modes and errors set in the speaker array device
3.
[0038]
The storage unit 29 stores programs executed by the system control unit 23, set values for
executing the programs, and the like.
[0039]
In the remote control device 5, the microphone MIC 31 is a directional microphone, picks up the
sound propagating from the surroundings, and outputs the sound signal to the amplifier 33.
[0040]
The amplifier 33 amplifies the audio signal output from the microphone MIC 31 and outputs the
amplified audio signal to the A / D converter 35.
[0041]
The A / D converter 35 converts (samples) the analog audio signal amplified by the amplifier 33
into a digital audio signal, and outputs the digital audio signal to the signal level detection unit
37.
[0042]
The signal level detection unit 37 outputs to the control unit 43 a volume level signal
corresponding to the level (volume level) of the audio signal output from the A / D converter 35.
04-05-2019
11
[0043]
The display unit 39 displays a message such as an operating mode or an error.
[0044]
The operation unit 41 receives the operation of the listener.
[0045]
The control unit 43 controls each unit of the remote control device 5.
[0046]
The IR code transmitter 45 outputs an infrared light signal according to the signal output from
the controller 43.
[0047]
Next, a method of specifying a listening position in the audio system 1 will be described.
The delay time to each audio signal based on the distance from the listening position of the
listener to each speaker unit SP1 to SPn so that only a specific listener listens to the desired voice
(audio content) from the speaker array device 3 Should be preset in the speaker array device 3.
[0048]
In order to set this delay time, the speaker array device 3 executes processing (position detection
processing) of measuring the distance from the listening position to the speaker units SP (SP1,
SPn) at both ends to detect the listening position.
Then, the speaker array device 3 calculates a delay time at which the sound from each of the
speaker units SP1 to SPn simultaneously reaches this listening position, and sets it as a delay
time to be added to the audio signal.
04-05-2019
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[0049]
FIG. 2 is a conceptual diagram for explaining position detection processing executed by the audio
system.
In the audio system 1, when the position detection process is performed, the remote control
device 5 is arranged in advance at a position (listening position) where the listener listens to the
sound emitted from the speaker array device 3.
At this time, the microphone MIC 31 of the remote control device 5 is disposed in the direction of
the speaker array 19 of the speaker array device 3.
[0050]
When the position detection process is started, the speaker array device 3 sequentially outputs
measurement sound from the speaker units SP1 and SPn at both ends.
When the remote control device 5 picks up the measurement sound from the microphone MIC
31, the remote control device 5 transmits a detection notification signal to that effect to the
speaker array device 3.
[0051]
In the speaker array device 3, the arrival time t1 (first arrival time until the remote control device
5 picks up the measurement audio after the speaker unit SP1 emits the measurement audio and
immediately receives the detection notification signal transmitted) Clock).
In addition, the arrival time t2 (second arrival time) from when the speaker unit SPn emits the
measurement sound to when the detection notification signal is received is counted.
The speaker array device 3 calculates the listening position using the arrival time t1 and the
04-05-2019
13
arrival time t2.
Since the time from when the remote control device 5 picks up the measurement voice to when
the speaker array device 3 receives the detection notification signal is short, it is ignored.
However, with regard to a system delay that takes time that can not be ignored, correction for
this time is performed to obtain arrival times t1 and t2.
[0052]
Moreover, the calculation method of this listening position uses the well-known method
(triangulation method) described in patent document 1 grade | etc.,.
Below, the calculation method which calculates a listening position based on FIG. 2 is
demonstrated.
[0053]
Here, in order to facilitate the description, the arrangement direction of the speaker units SP is
taken as an X axis, and an axis orthogonal to the X axis and parallel to the horizontal direction is
taken as a Y axis.
For the X axis, the right side toward the speaker array device 3, that is, the speaker unit SPn side
is a positive direction.
In the Y axis, the output direction of the audio signal from the speaker unit SP, that is, the user
side is a positive direction.
The intersection of the X axis and the Y axis, that is, the origin of the X axis and the Y axis is the
center of the speaker units SP1 to SPn.
04-05-2019
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[0054]
When the arrival time t1 and the arrival time t2 are equal, it means that the distance between the
remote control device 5 and the speaker unit SP1 is equal to the distance between the remote
control device 5 and the speaker unit SPn.
Therefore, remote control device 5 is positioned on the Y axis in FIG. 2, that is, on the center
front of speaker array device 3 (the position of remote control device 5 in the middle shown in
FIG. 2).
In this case, the calculation unit 239 determines the remote control device 5 and the speaker
array according to the following equation (1) from the arrival time t1 or the arrival time t2, the
sound speed c, and the distance (x1-x2) of the speaker unit SP1 and the speaker unit SPn The
distance y to the device 3 is calculated.
The coordinate of the X axis of the speaker unit SP1 is x1, and the coordinate of the speaker unit
SPn on the x axis is x2.
[0055]
y = [(c · t1) <2>-{(x2−x1) / 2} <2>] <1/2> = [(c · t2) <2> − {(x2−x1) / 2} <2>] <1/2> ... Formula
(1) Moreover, when arrival time t1 'is longer than arrival time t2', the distance between remote
control device 5 and speaker unit SP1 is equal to that between remote control device 5 and the
speaker It means that it is longer than the distance of unit SPn. Therefore, when remote control
device 5 is closer to the speaker unit SPn than the center of speaker array device 3, that is, when
FIG. 2 is viewed from the front, remote control device 5 is on the right side of the Y axis (position
of remote control device 5 at right end shown in FIG. 2) Located in In this case, the calculation
unit 239 calculates the coordinate x 'on the X axis of the remote control device 5 and the
distance y' between the remote control device 5 and the speaker array device 3 according to the
following equations (2) and (3).
[0056]
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15
x ′ = [(c · t1 ′) <2>-(c · t2 ′) <2> + (x2) <2>-(x1) <2>] / [2 (x2-x1)]... Formula (2) y '= [(c * t2')
<2>-(x2-x ') <2>] <1/2> = [(c * t1') <2>-(x'-x1] <2>] <1/2>. Formula (3) Moreover, when arrival
time t1 '' is shorter than arrival time t2 '', the distance between remote control device 5 and
speaker unit SP1 is remote control device 5 and the speaker It means shorter than the distance
of unit SPn. Therefore, when remote control device 5 is closer to speaker unit SP1 than the
center of speaker array device 3, that is, when FIG. 2 is viewed from the front, remote control
device 5 is on the left side of the Y axis (position of remote control device 5 at left end shown in
FIG. 2) Located in In this case, the calculation unit 239 calculates the coordinate x ′ ′ on the X
axis of the remote control device 5 and the distance y ′ ′ between the remote control device 5
and the speaker array device 3 according to the following equations (4) and (5).
[0057]
x ′ ′ = [(c · t1 ′) <2> − (c · t2 ′ ′) <2> + (x2) <2> − (x1) <2>] / [2 (x2−x1)]... Formula (4) y
'' = [(c * t2 '') <2>-(x2-x '') <2>] <1/2> = [(c * t1 '') <2>-(x ''-x1] ) <2>] <1/2> Equation (5) Next, in
the audio system 1, when specifying the listening position as described above, first, before
performing the listening position detection process, The volume level of the background noise is
measured, the volume level of the measurement voice is set based on the volume level of the
background noise, and the position detection processing for emitting the measurement voice is
performed. That is, when the background noise around the listening position where the remote
control device 5 is installed is small, the volume of the measurement sound emitted from the
speaker units SP1 and SPn of the speaker array device 3 is also reduced and mixed in with the
background noise. The sound volume for measurement can be picked up by the microphone
MIC31. In addition, when the background noise around the listening position where the remote
control device 5 is installed is large, the volume of the measurement sound emitted from the
speaker units SP1 and SPn of the speaker array device 3 is also increased and mixed in with the
background noise. The sound volume for measurement can be picked up by the microphone
MIC31. By doing this, the volume level of the measurement sound emitted from the speaker
array device 3 can be picked up (detected) by the microphone MIC 31 without being affected by
surrounding background noise, and the listener feels uncomfortable Can be set to an appropriate
volume level without giving.
[0058]
Further, in the audio system 1, when specifying the listening position as described above, before
performing the listening position detection process, the volume level of background background
04-05-2019
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noise is measured, and based on the volume level of the background noise. After the detection
threshold of the measurement voice is determined (set), position detection processing is
performed to emit the measurement voice. That is, when the background noise around the
listening position where the remote control device 5 is installed is small, the detection threshold
of the measurement sound emitted from the speaker units SP1 and SPn of the speaker array
device 3 is also reduced to the background noise level. Accordingly, when the volume of the
measurement audio is set small, the value is set so that the measurement audio can be detected
reliably. In addition, when background noise around the listening position where remote control
device 5 is installed is large, the detection threshold of the measurement sound emitted from
speaker units SP1 and SPn of speaker array device 3 is also increased to set the background
noise level. Accordingly, when the volume of the measurement voice is set large, the value is set
so that the measurement voice can be reliably detected. By doing this, it is possible to reliably
detect the measurement sound regardless of the background noise volume level.
[0059]
When the remote control device 5 detects that the listener operates the operation unit 41 to set
the listening position specification mode, the microphone MIC 31 picks up surrounding dark
noise. Then, the remote control device 5 detects the volume level of the background noise by the
signal level detection unit 37, and outputs a signal (IR code) corresponding to the volume level of
the background noise from the IR code transmission unit 45.
[0060]
FIG. 3 is a table showing the relationship between the background noise level and the IR code.
FIG. 3 shows an example in which the background noise volume level is classified into four stages
in order to simplify the description. When the volume level of background noise is small, remote
control device 5 transmits IR code A, and as the volume level of background noise at the time of
measurement becomes large, IR codes B, C,. Send D
[0061]
The speaker array device 3 adjusts the volume level of the measurement audio by the amplifiers
17-1 to 17-n, and the measurement audio from the speaker array 19 at the volume level
corresponding to the IR code received by the IR signal receiving unit 21. Emit a sound. That is,
04-05-2019
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when the speaker array device 3 receives the IR code A, the volume level is minimized and the
measurement voice is emitted. Further, as the received IR codes become B, C, and D in order, the
speaker array device 3 increases the volume level to emit the measurement sound.
[0062]
Next, in the audio system 1, as described above, the volume level of the measurement audio is set
according to the volume level of background noise at the listening position where the remote
control device 5 is installed. In some cases, the volume level of the measurement audio can not
be set to an appropriate value. That is, the volume level of the measurement sound is preset to be
appropriate at an assumed listening position such as near the center of the room. However, if the
listening position is at an unexpected position such as the end of a room or in an unexpected
environment, the remote control device 5 can be used as a measurement audio whose volume
level is set based on the volume level of ambient background noise. The microphone MIC31 may
not be able to collect (detect) sound, which may result in an error. Therefore, in the audio system
1, within a preset first time, the volume level of the measurement sound with respect to the
background noise level initially assigned is increased by a constant amount until the microphone
MIC 31 can collect the sound. It is set to perform re-measurement.
[0063]
This makes it possible to improve the measurement success probability at the time of
remeasurement, and to guarantee operation under various environments. Also, since the volume
level offset is cleared to zero (returned to the initial value) if the first time measurement is not
performed, the volume level is higher than necessary when the measurement environment
returns to the normal level. It can prevent the measurement from being performed.
[0064]
Specifically, the audio system 1 performs processing as follows. FIG. 4 is a diagram showing the
relationship between the volume level of background noise and the volume level of measurement
sound. Here, in FIG. 4, for both the background noise and the measurement sound, the minimum
value of the volume level is 1 and the numerical value becomes larger as it becomes larger.
04-05-2019
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[0065]
In the audio system 1, as an example, the system control unit 23 of the speaker array device 3
sets the volume level of measurement audio to 1 when background noise is at volume level 1 (see
FIG. 4A), and the speaker unit The measurement sound of volume level 1 is emitted from SP1 and
SPn. However, if the remote control device 5 can not pick up the measurement sound with the
microphone MIC 31 and there is no response even after a predetermined time has elapsed, the
system control unit 23 raises the volume level of the measurement sound by one step The level is
set to 2 (see FIG. 4B), and the measurement sound of volume level 2 is emitted from the speaker
units SP1 and SPn.
[0066]
When the remote control device 5 can not pick up measurement audio of volume level 2 with the
microphone MIC 31 and does not respond even after a predetermined time has elapsed, the
system control unit 23 further increases the volume level of the measurement audio. The sound
level is raised to 3 and the volume level is set to 3 (see FIG. 4C), and the measurement sound is
emitted from the speaker units SP1 and SPn. In addition, even if the system control unit 23 sets
the volume level of the measurement audio to 3, measurement can not be performed if the
microphone MIC 31 of the remote control device 5 can not collect the sound and there is no
response even after a predetermined time has elapsed. The volume level of the audio for use is
further raised by one step to set the volume level to 4 (see FIG. 4D), and the speaker units SP1
and SPn emit the measurement audio.
[0067]
As described above, the system control unit 23 increases the volume level of the measurement
audio by one step (by a predetermined amount) until the measurement audio can be detected. As
a result, instead of setting the measurement audio to a large volume level in advance, the volume
level of the measurement audio is gradually increased and set to a volume level that can be
collected by the microphone, which gives the listener an unpleasant feeling. The volume level of
the measurement audio can be set without.
[0068]
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19
In addition, the speaker array device 3 returns the volume level of the measurement audio to 1
when the first time (a time longer than the above-described predetermined time) has elapsed
since the measurement audio is repeatedly remeasured. As a result, even if the listener moves
and the listening position changes or the background noise volume level changes, the volume
level of the measurement audio returns to the original value (initial value) after the first time
period. As a result, the volume level of the measurement audio decreases, and the viewer does
not feel uncomfortable.
[0069]
The fixed amount for increasing the volume level of the measurement sound may be set in
advance by performing experiments or the like.
[0070]
Next, when the reverberation level of the place where the audio system 1 is installed is different,
even if the volume level of the measurement sound is the same, the listener may be
uncomfortable because it sounds different volume.
FIG. 5 is a diagram showing the relationship between the reverberation level and the elapsed
time, and the relationship between the reverberation time and the sound generation time. For
example, as shown in FIG. 5A, when the measurement sound is emitted in an indoor space having
a high reverberation level, the listener feels the volume level large because the reverberation
time is long. This is due to the following reasons. That is, human beings recognize not only the
sound level but also the whole volume level by integration according to the duration, so the
higher the reverberation level in the indoor space, the higher the sound volume level of the
sound even if the sound volume level is the same Because I feel it. Therefore, in the audio system
1, as shown in FIG. 5B, the longer the reverberation time of the indoor space where the speaker
array device 3 is installed (the higher the reverberation level), the two speakers of the speaker
array device 3 are sequentially Shorten the sound emission time of each measurement sound to
be emitted. This makes it possible to specify the listening position without giving the listener a
sense of discomfort.
[0071]
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20
Also, the higher the reverberation level in the indoor space, the longer the voice will reverberate.
Therefore, in the audio system 1, as shown in FIG. 5C, as the reverberation time of the indoor
space is longer (the reverberation level is larger), the sound release interval of the measurement
sound 1 and the measurement sound 2 (the sound emission start Increase the interval). For
example, when the reverberation level is small, the sound release interval of the measurement
voice 1 and the measurement voice 2 is set to tc, and the discharge interval of the measurement
voice 1 and the measurement voice 2 as the reverberation level increases. And set it to tb or ta.
As a result, since the measurement sound 2 can be emitted before the reverberation of the
measurement sound 1 disappears and the two sounds can be prevented from overlapping, the
listening position can be identified with certainty based on the measurement sounds 1 and 2 .
[0072]
Note that since the reverberation level in the indoor space does not change, the reverberation
level in the indoor space is measured in advance and stored in the storage unit 29, and this
reverberation level is read out at the time of the listening position identification processing. It is
good to emit measurement voice in time. Further, as a method of measuring the reverberation
level in the room, it is preferable to use, for example, a method of automatically measuring the
reverberation time as described in JP-A-8-247837.
[0073]
Next, in the audio system 1, an operation when specifying a listening position will be described
based on a flowchart. FIG. 6 is a flowchart for explaining the operation of the remote control
device and the speaker array device that constitute the audio system.
[0074]
Here, the audio system 1 measures the reverberation level in the room immediately after
installation and stores the reverberation level in the storage unit 29. When performing the
process of specifying the listening position, measurement is performed based on the
reverberation level read out from the storage unit 29. Set the sound emission time and sound
emission interval of the voice.
[0075]
As shown in FIG. 6, when the control unit 43 of the remote control device 5 detects that the user
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21
operates the operation unit 41 to set to execute the listening position identification process (s1),
the listening position identification process is started. Are transmitted from the IR code
transmitter 45 (s2).
[0076]
When the system control unit 23 of the speaker array device 3 detects that the IR signal
reception unit 21 has received the IR code (s51), the system control unit 23 receives the start of
the listening position identification process and performs initial setting (s52).
[0077]
Subsequent to step s2, the control unit 43 of the remote control device 5 picks up the
surrounding background noise with the microphone MIC 31, and detects the volume level by the
signal level detection unit 37 (s3).
Then, the control unit 43 transmits an IR code corresponding to the volume level of the
background noise detected by the signal level detection unit 37 from the IR code transmission
unit 45 (s4).
Further, the control unit 43 starts detection processing of the measurement sound 1 (s5).
[0078]
The system control unit 23 of the speaker array device 3 uses the IR signal receiving unit 21 to
measure the voice according to the volume level of the background noise based on the IR code
according to the volume level of the background noise. The sound volume level and the detection
threshold of the measurement audio are determined, the amplification factor of the amplifier 171 is changed, and the measurement audio 1 is emitted from the speaker unit SP1 (s53).
At this time, the sound emission time of the measurement sound 1 is set based on the
reverberation level of the indoor space in which the audio system 1 is installed. Further, the
system control unit 23 starts clocking by the timer unit 235 simultaneously with the start of
emission of the measurement sound 1 (s54).
04-05-2019
22
[0079]
When the control unit 43 of the remote control device 5 can pick up and detect the measurement
voice 1 with the microphone MIC 31 without being mixed with background noise (s6), the IR
code (immediately detecting the measurement voice 1 (IR code) The detection notification signal
of the measurement voice 1) is sent from the IR code sending unit 45 (s7).
[0080]
When the IR signal receiving unit 21 receives the IR code (detection notification signal of the
measurement sound 1) (s55), the system control unit 23 of the speaker array device 3 checks the
timer unit 235 and releases the measurement sound 1 The arrival time t1 from the sound to the
reception of the IR code is stored in the time storage unit 237 (s56).
[0081]
On the other hand, when the control unit 43 of the remote control device 5 can not detect the
measurement sound 1 due to background noise (s6), the control unit 43 can not respond to the
speaker array device 3 and continues detection of the measurement sound 1 .
[0082]
If the system control unit 23 can not receive the IR code (detection notification signal of the
measurement voice 1) from the remote control device 5 (s55), and a predetermined time has
elapsed since the timekeeping unit 235 started counting ( s57) The remote control device 5
determines that the measurement audio 1 can not be detected, resets the clock unit 235, raises
the volume level of the measurement audio 1 by one step, and emits the measurement audio 1
again To do (s58).
In addition, at this time, the system control unit 23 starts timing by the timing unit 235
simultaneously with the start of emission of the measurement voice 1 (s54).
[0083]
The control unit 43 of the remote control device 5 continues the process of step s6 until the
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23
measurement voice 1 can be detected, and when the measurement voice 1 is detected, the IR
code immediately transmits the detection of the measurement voice 1 (for measurement The
detection notification signal of voice 1) is sent from the IR code sending unit 45 (s7).
Further, the control unit 43 starts the process of detecting the measurement sound 2 (s10).
[0084]
The system control unit 23 repeats the processes of steps s 54 → s 55 → s 57 → s 58 → s 54
until the IR code (detection notification signal of measurement voice 1) is received from the
remote control device 5 and the IR code is received (s 55) ), The timekeeping unit 237 is
confirmed, and the arrival time t1 from the emission of the measurement sound 1 to the
reception of the IR code is stored in the time storage unit 237 (s56).
[0085]
Subsequently, the system control unit 23 of the speaker array device 3 checks the time
measuring unit 235 and emits the measurement sound 1, and then the time for the sound
emission interval set according to the reverberation level of the indoor space If it has not elapsed,
it waits until the time for this sound release interval elapses.
When the time for the sound release interval has elapsed (s60), the system control unit 23
causes the speaker unit SP1 to emit the measurement sound 2 at the volume level of the
measurement sound determined in step s53 (s61).
At this time, the system control unit 23 starts timing by the timing unit 235 simultaneously with
the start of emission of the measurement sound 2 (s62).
[0086]
When the control unit 43 of the remote control device 5 can collect and detect the measurement
sound 2 with the microphone MIC 31 without being mixed in background noise (s11), the IR
code (immediately detecting the measurement sound 2 (IR code) The detection notification signal
of the measurement voice 2 is sent from the IR code sending unit 45 (s12). Then, the control unit
04-05-2019
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43 ends the process of specifying the listening position.
[0087]
When the IR control unit 21 receives the IR code (detection notification signal of the
measurement sound 2) by the IR signal reception unit 21 (s63), the system control unit 23 of the
speaker array device 3 stops the timing unit 235 and releases the measurement sound 2 The
arrival time t2 from the sound to the reception of the IR code is stored in the time storage unit
237 (s64). Also, the timer unit 235 is reset to stop the clocking.
[0088]
On the other hand, when the control unit 43 of the remote control device 5 can not detect the
measurement sound 2 due to background noise (s11), the control unit 43 can not respond to the
speaker array device 3 and continues detection of the measurement sound 2 .
[0089]
If the system control unit 23 can not receive the IR code (detection notification signal of the
measurement sound 2) from the remote control device 5 (s63), and a predetermined time has
elapsed since the timekeeping unit 235 started counting ( s65), the remote control device 5
determines that the measurement voice 2 can not be detected, resets the clock section 235,
raises the measurement signal level of the measurement voice 2 by one step, and releases the
measurement voice 2 again. Sound (s66).
Further, at this time, the system control unit 23 starts clocking by the clock unit 235
simultaneously with the start of emission of the measurement sound 2 (s62).
[0090]
The control unit 43 of the remote control device 5 continues the process of step s11 until the
measurement sound 2 can be detected, and when the measurement sound 2 is detected, the IR
code immediately transmits the detection of the measurement sound 2 (for measurement The
detection notification signal of voice 2) is sent from the IR code sending unit 45 (s12). Then, the
04-05-2019
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control unit 43 ends the process of specifying the listening position.
[0091]
Further, the system control unit 23 repeats the process of steps s62 → s63 → s65 → s66 → s62
until the IR code (detection notification signal of the measurement sound 1) is received from the
remote control device 5, and the IR code is received. (S62) The timer unit 235 is stopped, and the
arrival time t2 from the emission of the measurement sound 2 to the reception of the IR code is
stored in the time storage unit 237 (s63). Also, the timer unit 235 is reset to stop the clocking.
[0092]
Subsequently, the system control unit 23 of the speaker array device 3 reads out the arrival
times t1 and t2 from the time storage unit 237, and based on these arrival times, the abovedescribed formulas (1) to (5) are used. By performing the calculation, the distance from the
speaker units SP1 and SPn to the listening position is calculated (s67).
[0093]
Then, the system control unit 23 sets a delay control value such that the voice beam is directed
to the listening position in the beam forming unit 13 (s68), and ends the process of specifying
the listening position.
[0094]
In the above description, in step s61, the measuring sound 2 is emitted from the speaker unit
SP1 at the volume level of the measuring sound based on the background noise determined in
step s53. When the code is received, the volume level of the measurement audio 2 may be set
based on the volume level of the measurement audio 1 immediately before that.
For example, the volume level of the measurement audio 2 may be set to the same volume level
as the final volume level of the measurement audio 1.
[0095]
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26
Further, in the above description, the background noise and the measurement voices 1 and 2 are
picked up by the microphone MIC 31 provided in the remote control device 5, but the present
invention is not limited to this. A cable of a wired microphone installed at a listening position The
speaker array device 3 may be connected to the speaker array device 3, and the speaker array
device 3 may perform processing of background noise collected by the microphone and the
measurement sounds 1 and 2.
The microphones may be wireless (wireless type) or wired (wired type), and the speaker array
device 3 may be configured according to the form of the microphones.
[0096]
Further, in the above description, although the configuration is such that the measurement sound
is emitted from the speaker units SP1 and SPn, the present invention is not limited thereto, and
the configuration may be such that another speaker unit SP emits the measurement sound. .
Although the configuration is such that the measurement sound is emitted from the speaker units
SP1 and SPn, it is also possible to emit the measurement sound from another speaker unit.
[0097]
Although the speaker array device 3 is configured to integrally include the speaker array 19, the
present invention is not limited to this. For example, the configuration may be used instead of the
configuration in which the speaker array 19 and a functional unit that performs signal
processing for adjusting delay time and output level on an audio signal are separately provided.
[0098]
Further, the present invention is not only applied to the audio system 1 including the speaker
array device 3 and the remote control device 5, but can be applied to, for example, a multichannel audio system including a plurality of speaker units.
[0099]
04-05-2019
27
It is a block diagram which shows schematic structure of an audio system.
It is a conceptual diagram for demonstrating the position detection process which an audio
system performs. It is a table showing the relation between the background noise level and the IR
code. It is a figure which shows the relationship between the volume level of background noise,
and the volume level of the sound for measurement. It is a figure which shows the relationship
between a reverberation level and elapsed time, and the relationship between reverberation time
and sound production time. It is a flowchart for demonstrating the operation | movement of the
remote control apparatus which comprises an audio system, and a speaker array apparatus.
Explanation of sign
[0100]
1-Audio System 3-Speaker Array Device 5-Remote Control Device 11-Input Unit 13-Beam
Forming Unit 15-D / A Converter 17, 33-Amplifier 19-Speaker Array 21-IR Signal Receiving Unit
23- System Control Unit 25- Operation unit 27-Display unit 29-Storage unit 35-A / D converter
37-Signal level detection unit 39-Display unit 41-Operation unit 43-Control unit 45-IR code
transmission unit 111-External input terminal 231-Measurement voice Processing unit 233Position detection processing unit 235-Time measuring unit 237-Time storage unit 239Operation unit MIC 31-Microphone SP, SP1 to SPn-Speaker unit
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