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JP2008227891

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2008227891
The present invention performs delay time measurement that is useful in achieving accurate
synchronization of audio of each channel at a listening position while adopting a multi-channel
method. A background noise estimation unit 251 estimates a background noise amount level at a
sound collection position, and a subtraction unit 261 subtracts the estimated background noise
amount level to calculate a corrected volume. Subsequently, the threshold time specifying unit
262 specifies a threshold time at which the time integral value of the corrected sound volume
after the output of the test voice reaches a predetermined threshold. Then, the delay estimation
unit 263 estimates that the time when the correction volume becomes maximum is the arrival
time of the direct wave of the test voice to the sound collection position in the period from the
output of the test voice to the threshold time. Based on the estimation result of the arrival time,
the propagation delay time from the speaker that has output the test voice to the sound
collection position is estimated. [Selected figure] Figure 8
Acoustic device, delay measurement method, delay measurement program and recording
medium therefor
[0001]
The present invention relates to an acoustic device, a delay measurement method, a delay
measurement program, and a recording medium therefor.
[0002]
2. Description of the Related Art Conventionally, audio devices adopting a multi-channel system
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in which a plurality of speakers such as 5.1 channel surround system are combined have become
widespread.
In such an audio apparatus, in order to reproduce music and the like so that the listener does not
feel uncomfortable, it is necessary to synchronize the output sound from each speaker as
intended by the creator of the audio content such as music.
[0003]
In order to realize such synchronization, a technique has been proposed for measuring the
propagation delay time of the output sound from each speaker by sequentially supplying an Msequence signal to each speaker and outputting the sound (see Patent Document 1). : Hereinafter
referred to as "conventional example"). In this prior art technique, the sound output from each
speaker is collected by the microphone to measure the impulse response, and then the peak
value of the impulse response is detected. Then, a value obtained by multiplying a peak value
detected corresponding to each speaker by a predetermined constant (a constant less than 1) is
set as a threshold value of each speaker.
[0004]
Next, in the sound collection result for each speaker, the rising point of the impulse response that
first exceeds the corresponding threshold is detected. Then, for each speaker, the time from the
time when the M-sequence signal is supplied to the time when the signal rises is determined as
the propagation delay time of the output sound.
[0005]
Subsequently, based on the determined propagation delay time of each speaker, the amount of
delay time by the delay device disposed corresponding to each speaker is set. Thereafter, an
audio signal is supplied to each speaker through a delay set with a delay time amount. As a
result, the output sound from each speaker can be synchronized at the listening position.
[0006]
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Patent No. 3148060
[0007]
In the above-described prior art, the propagation delay time of the output sound from the
speaker is obtained using the threshold value obtained from the peak value of the impulse
response.
However, for example, in a closed space which is not wide such as the cabin of a vehicle, the
reflected sound also enters the microphone at a timing close to the direct sound of the sound
output from the speaker. Also ambient noise is incident on the microphone. For this reason, there
are cases where the peak of the direct sound from the speaker can not be accurately detected
from the sound collection result at the sound collection position. In particular, in the case of
sound output from a speaker dedicated to high-frequency reproduction such as tweeter, the
influence of the reflected sound becomes large, and even if the technique of the conventional
example is applied, listening to the output sound from each speaker The synchronization at the
position can not be achieved with high accuracy, which may result in a sense of discomfort to the
listener.
[0008]
For this reason, also in the cabin of a vehicle, the propagation delay time of the sound from each
speaker to the sound collecting position can be accurately determined, and a technology that can
accurately synchronize the listening position of the output sound from each speaker is desired. It
is done. Responding to such a request is one of the problems to be solved by the present
invention.
[0009]
The present invention has been made in view of the above circumstances, and it is an object of
the present invention to provide a new acoustic device capable of accurately synchronizing the
sound of each channel at a listening position while adopting a multi-channel system. I assume.
[0010]
Another object of the present invention is to provide a new delay measurement method that is
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useful in achieving accurate synchronization of audio of each channel at a listening position
while adopting a multi-channel method.
[0011]
The invention according to claim 1 is an acoustic apparatus which directs a reproduction result
of audio content to a sound field space from a plurality of speakers and outputs sound, and
performs sound collection at a predetermined sound collection position in the sound field space.
Sound collecting means; dark noise estimating means for estimating the background noise
amount level of the sound field space based on the sound collecting result by the sound
collecting means in a state where no sound is output from any of the plurality of speakers Test
sound generation means for outputting a test sound from a selected speaker which is a speaker
selected from the plurality of speakers; each time obtained based on a sound collection result of
the sound collection means after the test sound is output Subtraction means for calculating a
corrected volume at each time obtained by subtracting the background noise amount level
estimated by the background noise estimation means from the sound collection volume of
Specifying means for specifying the reached threshold time; and a time at which the correction
volume becomes maximum within a period from the output time of the test voice to the threshold
time is a reaching time of the test voice to the sound collecting means Delay estimation means
for estimating and estimating the time from the output time of the test speech to the estimated
arrival time as the propagation delay time of the test speech from the selected speaker to the
sound collection means; Is an acoustic device characterized by
[0012]
The invention according to claim 7 is a background noise estimation step of estimating a
background noise amount level in a predetermined sound field space; a speaker selected from
among a plurality of speakers for outputting voice toward the sound field space A test sound
output step of outputting a test sound from a selected speaker; a subtraction step of subtracting
the background noise amount level estimated from a sound collection volume obtained as a
sound collection result after the test sound is output; Specifying the time when the time integral
value of the corrected sound volume obtained in the subtraction step reaches a predetermined
threshold after the output of the test step; and the time from the output of the test voice to the
time specified in the specifying step An arrival time estimation step of estimating a time at which
the correction volume is maximum within a period as an arrival time of the test sound from the
selected speaker to the sound collection position; A delay estimation step of estimating a time
from an output time of a test voice to an arrival time estimated in the arrival estimation time step
as a propagation delay time of the test speech from the selected speaker to the sound collection
position; It is a delay measurement method characterized by
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[0013]
The invention according to claim 8 is a delay measurement program that causes a computing
unit to execute the delay measurement method according to claim 7.
[0014]
The invention according to claim 9 is a recording medium on which the delay measurement
program according to claim 8 is recorded so as to be readable by an operation means.
[0015]
Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
In the following description and the drawings, the same or equivalent elements will be denoted
by the same reference symbols, without redundant description.
[0016]
[Configuration] FIG. 1 is a block diagram showing a schematic configuration of an acoustic device
100 according to an embodiment.
In the following description, it is assumed that the acoustic device 100 is mounted on a vehicle
CR (see FIG. 2), which is a moving body, and adopts the 5.1 channel surround system.
[0017]
As shown in FIG. 1, the acoustic device 100 includes a control unit 110 and a drive unit 120.
[0018]
The acoustic device 100 further includes a sound output unit 130C, a sound output unit 130L, a
sound output unit 130R, a sound output unit 130SL, a sound output unit 130SR, and a sound
output unit 130SW.
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Here, the sound output unit 130C has a center speaker 131C, and the sound output unit 130L
has a left speaker 131L.
Further, the sound output unit 130R has a light speaker 131R, and the sound output unit 130SL
has a surround left speaker 131SL.
Further, the sound output unit 130SR has a surround light speaker 131SR, and the sound output
unit 130SW has a subwoofer speaker 131SW.
[0019]
Furthermore, the sound device 100 includes a sound collection unit 140 as a sound collection
unit, a display unit 150, and an operation input unit 160.
[0020]
The elements 120 to 160 other than the control unit 110 are connected to the control unit 110.
[0021]
The control unit 110 centrally controls the entire sound device 100.
The details of the control unit 110 will be described later.
[0022]
When the compact disk CD in which the sound content is recorded is inserted and the drive unit
120 receives the reproduction command DVC of the sound content from the control unit 110,
the drive unit 120 reads the sound for which the reproduction is specified from the content
compact disk CD.
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The readout result of the sound content is sent to the control unit 110 as content data CTD
which is an audio signal.
[0023]
Each of the sound output units 130C, 130L, 130R, 130SL, 130SR, and 130SW includes an
amplifier for amplifying an audio output signal received from the control unit 110, in addition to
the above-described speakers.
The sound output units 130 </ b> C to 130 </ b> SW reproduce and output guidance voice,
music, and the like under the control of the control unit 110.
[0024]
In the present embodiment, as shown in FIG. 2, the center speaker 131C of the sound output unit
130C is disposed in the dashboard in the front center of the sound field space ASP, which is the
in-vehicle space of the vehicle CR.
The center speaker 131C is disposed to face the rear.
[0025]
The left speaker 131L of the sound output unit 130L is disposed in a front door housing on the
passenger seat side. The left speaker 131L is disposed to face the front passenger seat.
[0026]
The light speaker 131R of the sound output unit 130R is disposed in the front door housing on
the driver's seat side. The light speaker 131R is disposed to face the driver's seat.
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[0027]
The surround left speaker 131SL of the sound output unit 130SL is disposed in a rear case on
the front passenger seat side. The surround left speaker 131SL is disposed to face a rear seat on
the passenger seat side.
[0028]
The surround light speakers 131SR of the sound output unit 130SR are disposed in a rear case
on the driver's seat side. The surround light speaker 131SR is disposed to face the rear seat on
the driver's seat side.
[0029]
The subwoofer speaker 131SW of the sound output unit 130SW is disposed at the rear of the
sound field space ASP. The subwoofer speaker 131SW is disposed toward the front of the
vehicle.
[0030]
Returning to FIG. 1, the sound collection unit 140 includes (i) a microphone for collecting
ambient sound to obtain an electrical analog audio signal, and (ii) an amplifier for amplifying an
analog audio signal input from the microphone. It is configured. Here, the microphone is
disposed at a predetermined at least one position in the sound field space ASP. The sound
collection result data AAD by the sound collection unit 140 is reported to the control unit 110.
[0031]
The display unit 150 is based on (i) a display device 151 such as a liquid crystal display panel, an
organic EL (Electro Luminescence) panel, or a PDP (Plasma Display Panel), and (ii) display control
data IMD sent from the control unit 110. A display controller such as a graphic renderer that
controls the entire display unit 150, and (iii) a display image memory for storing display image
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data, and the like. The display unit 150 displays operation guidance information and the like
under the control of the control unit 110.
[0032]
The operation input unit 160 is configured of a key portion provided on the main body portion of
the acoustic device 100 or a remote input device or the like including the key portion. Here, as a
key part provided in the main body part, a touch panel provided in the display device 151 of the
display unit 150 can be used. In addition, it can replace with the structure which has a key part,
and can also employ | adopt the structure which voice-inputs.
[0033]
When the user operates the operation input unit 160, the setting of the operation content of the
acoustic device 100 is performed. For example, the user uses the operation input unit 160 to set
the frequency characteristics of the speakers, reproduce the sound content, and the like. Such
input contents are sent from the operation input unit 160 to the control unit 110 as operation
input data IPD.
[0034]
The control unit 110 generally controls the entire acoustic device 100 as described above. As
shown in FIG. 3, the control unit 110 includes a control processing unit 111, a channel signal
processing unit (CSP) 112 as an adjustment unit, a volume adjustment unit (VLA) 113, and a
signal selection unit (SSL) 114. And a test signal generation unit (TSG) 115 as test sound
generation means.
[0035]
The control processing unit 111 controls the channel signal processing unit 112, the volume
adjustment unit 113, the signal selection unit 114, and the test signal generation unit 115 based
on the command input input to the operation input unit 160 and the sound collection result by
the sound collection unit 140. Control. Further, the control processing unit 111 controls the
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drive unit 120 and the display unit 150. The control processing unit 111 will be described later.
[0036]
The channel signal processing unit 112 receives the content data CTD from the drive unit 120.
Then, the channel signal processing unit 112 processes each of a plurality of channel data (six
channel data in this embodiment) included in the content data CTD. As shown in FIG. 4, the
channel signal processing unit 112 includes a channel separation unit (CHS) 210, a frequency
characteristic correction unit (FCS) 220, and a delay unit (DLA) 230 as delay means. .
[0037]
The channel separation unit 210 receives the content data CTD. Then, the channel separation
unit 210 having received the content data CTD expands the content data CTD and generates a
digital sound data signal which is an audio signal. Subsequently, the channel separation unit 111
analyzes the generated digital sound data signal, and in accordance with channel designation
information included in the digital sound data signal, the digital sound data signal is transmitted
to the C channel, L channel, R channel, and SL channel described above. The digital sound data
signal is converted into a data signal of C to SW channel by separating it into data signals of SR
channel and SW channel. The six channel signals LDC, LDL, LDR, LDSL, LDSR, and LDSW, which
are data signals separated into each channel in this way, are sent to the frequency characteristic
correction unit 220.
[0038]
The frequency characteristic correction unit 220 receives the channel signals LDC to LDSW.
Then, the frequency characteristic correction unit 220 corrects the frequency of each of the
channel signals LDC to LDSW in accordance with the frequency characteristic correction
instruction FCC from the control processing unit 111. The correction result is sent to the delay
unit 230 as the frequency characteristic correction signals FCDC to FCDSW. The frequency
characteristic correction unit 220 outputs the data signal SST in the middle of the frequency
characteristic correction to the control processing unit 111 for generation of the frequency
characteristic correction instruction FCC.
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[0039]
Delay unit 230 receives frequency characteristic correction signals FCDC to FCDSW. Then,
frequency characteristic correction unit 220 delays each of frequency characteristic correction
signals FCDC to FCDSW in accordance with delay control command DLC from control processing
unit 111. The delay unit 230 having such a function includes six delay devices 221C to 221SW
as shown in FIG.
[0040]
Each of the delay devices 221 j (j = C to SW) delays the frequency characteristic correction
signals FCDC to FCDSW by a delay time DLj specified by an individual delay control command
DLCj in the delay control command DLC. The delay results are sent to the volume adjustment unit
113 as channel processing signals CPDC to CPDSW.
[0041]
Returning to FIG. 3, the volume adjustment unit 113 receives the channel processing signals
CPDC to CPDSW. Then, the volume adjustment unit 113 adjusts the volume of each of the
channel processing signals CPDC to CPDSW in accordance with the volume adjustment command
VLC from the control processing unit 111. The adjustment result is sent to the signal selection
unit 114 as the adjustment volume signals CVDC to CVDSW.
[0042]
The signal selection unit 114 receives the volume control signals CVDC to CVDSW and the test
audio signal GSS from the test signal generation unit 115. Then, in accordance with the output
selection instruction ODS from the control processing unit 111, the signal selection unit 114
supplies the adjusted volume signal CVDj and the test audio signal GSS to each of the sound
output units 130j (j = C to SW). , And select not to supply any signal. The signal selection part
114 which has this function is provided with switch element 241C-241SW, as FIG. 6 shows.
[0043]
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Each of the switch elements 241 j has an A terminal and a B terminal as input terminals, and a C
terminal as an output terminal. The switch element 241 j receives the adjusted volume signal
CVDj at the A terminal and receives the test voice signal GSS at the B terminal. Then, according to
the individual selection command ODSj in the output selection command ODS, the A terminal and
the C terminal are connected, the B terminal and the C terminal are connected, and further, the C
terminal is connected to both the A terminal and the B terminal. It does not exist. The selected
signal (including no signal) is sent from the C terminal of the switch element 241j to the sound
output unit 130j as the sound output signals AODC to AODSW.
[0044]
Returning to FIG. 3, when receiving a test signal generation command SGC including a sound
output unit designation from the control processing unit 111, the test signal generation unit 115
generates a test voice signal GSS corresponding to the frequency characteristics of the speakers
131C to 131SW. . The test voice signal GSS generated in this manner is sent to the signal
selection unit 114.
[0045]
The control processing unit 111 exerts the function of the acoustic device 100 while controlling
the other components described above. As shown in FIG. 7, the control processing unit 111
includes a background noise estimation unit (NLE) 251 as a background noise estimation unit, a
delay measurement unit (DLM) 252, and a control unit (CNT) 253. There is.
[0046]
Under the control of the control unit 253, the background noise estimation unit 251 estimates
the background noise amount level in the sound field space ASP based on the sound collection
result data AAD from the sound collection unit 140. More specifically, when the background
noise estimation unit 251 receives the estimation start instruction NMR from the control unit
253, the background noise estimation unit 251 starts collecting the sound collection result data
AAD. Then, the background noise estimation unit 251 collects the sound collection result data
AAD over the predetermined time period TNM.
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[0047]
The predetermined time TNM is determined in advance based on experiments, simulations,
experiences, etc. from the viewpoint of accurate estimation of the background noise amount
level.
[0048]
Thus, when collection of the sound collection result data AAD for a predetermined time period is
completed, the background noise estimation unit 251 statistically processes the collected data to
obtain an estimated value PD of the background noise amount level in the sound field space ASP.
calculate.
The calculated estimated value PD is sent to the delay measurement unit 252 as a background
noise notification signal DNL. In this way, when the estimation of the background noise amount
level is completed, the background noise estimation unit 251 reports that effect to the control
unit 253 as an estimated termination report NMP.
[0049]
Under the control of the control unit 253, the delay measurement unit 252 selects one of the
speakers 131C to 131SW based on the estimated value PD of the background noise amount level
estimated by the background noise estimation unit 251 and the sound collection result data AAD.
The propagation delay time of the sound to the installation position of the microphone of the
sound collection unit 140 is measured. The delay measuring unit 252 having such a function is,
as shown in FIG. 8, a subtracting unit (SUB) 261 as a subtracting unit, a threshold time specifying
unit (TTI) 262 as a specifying unit, and a delay estimating unit. And an estimation unit (DLE) 263.
[0050]
The subtraction unit 261 receives the sound collection result data AAD from the sound collection
unit 140 and the background noise notification signal DNL from the background noise estimation
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unit 251. Then, upon receiving the delay measurement start command DMR from the control
unit 253, the subtraction unit 261 starts periodical acquisition of the sound collection result data
AAD. Based on the sound collection result data AAD thus taken in, the subtraction unit 261
calculates the sound volume PA (t) at the sound collection position at each time. Subsequently,
the subtracting unit 261 calculates a corrected volume CPA (t) obtained by subtracting the
background noise amount level PD from the volume PA (t).
[0051]
The calculation and temporary storage of the correction volume CPA (t) is continued for a
predetermined time TDM. Then, when the predetermined time TDM has elapsed, the subtraction
unit 261 sends the correction volume CPA (t) of each time obtained within the predetermined
time TDM to the threshold time identification unit 262 as a correction volume report APW.
[0052]
In addition, predetermined time TDM is previously determined based on experiment, simulation,
experience, etc. in consideration of the arrival time to the sound collection position of various
reflections resulting from the output sound from the speakers 131C to 131SW.
[0053]
The threshold time identification unit 262 receives the corrected volume report APW from the
subtraction unit 261.
The threshold time specifying unit 262 calculates a total integrated value EGT over a
predetermined time TDM of the corrected volume CPA (t) received from the subtracting unit 261
as the corrected volume report APW. Subsequently, the threshold time identification unit 262
multiplies the value EGT by the predetermined ratio C to calculate the threshold ETH. Next, the
threshold time specifying unit 262 specifies a time TT at which the time integral value of the
corrected volume CPA (t) from the beginning has reached the threshold ETH. Then, the threshold
time specifying unit 262 sends the corrected volume CPA (t) from the beginning to the time TT to
the delay estimating unit 263 as a specified result IDR.
[0054]
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The predetermined ratio C to be multiplied by the value EGT is determined in advance based on
experiments, simulations, experiences, etc. in consideration of reflection positions and
reflectances in various reflections in warm space of the output sound from the speakers 131C to
131SW. .
[0055]
The delay estimation unit 263 receives the identification result IDR from the threshold time
identification unit 262.
Then, the delay estimation unit 263 analyzes the correction volume CPA (t) from the beginning of
the time received as the identification result IDR to the time TT, and specifies the time TR at
which the value becomes maximum. Subsequently, the delay estimation unit 263 estimates the
propagation delay time TTD of the test sound from the speaker to which the test sound is output
to the sound collection position by obtaining the time from the beginning to the time TR. Thus,
when the measurement is completed, the delay estimation unit 263 reports the fact that the
delay measurement is completed and the measurement result TTD to the control unit 253 as a
measurement result DMP.
[0056]
Returning to FIG. 7, the control unit 253 controls the operation in two modes of “reproduction
mode” and “delay time setting mode”. Here, the "reproduction mode" is a mode in which
sound contents are read out from the compact disc CD and the audio signal is reproduced, and
the "delay time setting mode" is a test audio signal generated and measured, and the sound
output unit 130C, In order to perform time alignment correction of audio output timing from
each of 130L, 130R, 130SL, 130SR, and 130SW, a delay time corresponding to each of the
speakers 131 j (j = C to SW) is set.
[0057]
The control unit 253 analyzes the operation input data IPD received from the operation input
unit 160, and the acoustic device 100 performs operation control of either “reproduction
mode” or “delay time setting mode”. More specifically, the control unit 253 usually controls
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the operation of the “reproduction mode”. On the other hand, when receiving a delay time
setting command from the operation input unit 160, the control unit 253 controls the operation
of the “delay time setting mode”. Then, when the control of the operation in the “delay time
setting mode” is finished, the control unit 253 returns to the operation control in the
“reproduction mode”.
[0058]
In controlling the operation of the “delay time setting mode”, the control unit 253 first sends
an estimation start command NMR to the background noise estimation unit 251. Subsequently,
when the control unit 253 receives the estimation end report NMP from the background noise
estimation unit 251, the control unit 253 controls delay time measurement for each of the sound
output units 130C to 130SW.
[0059]
When controlling the delay time measurement, the control unit 253 causes the B terminal and
the C terminal of the switch element corresponding to the sound output unit to be the first
measurement target in the signal selection unit 114 to conduct, and the C of the other switch
elements. An output selection instruction ODS for designating that the terminal does not conduct
with either the A terminal or the B terminal is sent to the signal selection unit 114. Subsequently,
the control unit 253 sends the test signal generation command SGC specifying the sound output
unit to be first measured to the test signal generation unit 115 and sends the delay measurement
start command DMR to the delay measurement unit 252.
[0060]
Then, when receiving the measurement result DMP related to the first sound output unit to be
measured, the control unit 253 causes terminals B and C of the switch element corresponding to
the sound output unit to be measured next in the signal selection unit 114. And sends to the
signal selection unit 114 an output selection instruction ODS specifying that the C terminal of the
other switch element is not conductive to either the A terminal or the B terminal. Subsequently,
the control unit 253 sends the test signal generation command SGC specifying the sound output
unit to be first measured to the test signal generation unit 115 and sends the delay measurement
start command DMR to the delay measurement unit 252.
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[0061]
Thereafter, the control unit 253 controls the signal selection unit 114, the test signal generation
unit 115, and the delay measurement unit 252 as described above until the delay measurement
for all the sound output units is completed. Then, when the delay measurement results for all
sound output units are obtained, the control unit 253 analyzes the delay measurement results,
and the delay time DLC of the sound output data signals AODC to AODSW supplied to each sound
output unit 130C to 130SW. Calculate DLSW (see FIG. 5). Then, the control unit 253 stores the
calculation result inside and sends it to the delay unit 230 as a delay control command DLC.
[0062]
Thus, when the delay time setting in the delay unit 230 is performed, the control unit 253 ends
the operation control of the “delay time setting mode”.
[0063]
Control unit 253 instructs output selection command ODS to make terminal A and terminal C
electrically conductive for all of switch elements 241C to 241SW toward the signal selection unit
114 at the time of operation control in the “reproduction mode”. Are sent to the signal
selection unit 114.
As a result, the adjusted volume signals CVDC to CVDSW from the volume adjustment unit 113
are supplied to the sound output units 130C to 130SW as the sound output data signals AODC to
AODSW through the signal selection unit 114.
[0064]
In addition, the control unit 253 causes the display unit 150 to display a guidance screen for
supporting the specification of the content to be reproduced by the user at the time of the
operation control of the “reproduction mode”. Then, when a playback instruction specifying
playback content is input to the operation input unit 160, the control unit 253 controls the drive
unit 120 to control data reading of the playback content.
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[0065]
Further, the control unit 253 controls frequency characteristic correction of the channel signals
LDC, LDL, LDR, LDSL, LDSR, LDSW included in the content data signal CTD from the drive unit
120 at the time of operation control of the “reproduction mode”. At the time of control of this
frequency characteristic correction, control unit 253 refers to data signal SST in the middle stage
of frequency characteristic correction from frequency characteristic correction unit 220 to
generate frequency characteristic correction command FCC and sends it to frequency
characteristic correction unit 220. .
[0066]
In addition, when controlling the operation in the “reproduction mode”, the control unit 253
controls the volume adjustment unit 113 to adjust the output volume from the speakers 131C to
131SW of the sound output units 130C to 130SW. When controlling the output volume, the
control unit 253 generates a volume adjustment instruction VLC based on the volume
specification input to the operation input unit 160 and the noise level obtained from the sound
collection result by the sound collection unit 140, and adjusts the volume. Send to unit 113.
[0067]
Note that, when the control unit 253 starts the operation due to the power ON or the like, the
delay unit 230 uses the delay control instruction DLC as a delay control instruction DLC for
setting the delay time DLC to DLSW stored internally at that time. It is supposed to be sent to the
destination.
[0068]
[Operation] Next, the operation of the acoustic device 100 configured as described above will be
described focusing mainly on the operation in the “delay time setting mode”.
[0069]
As described above, the “delay time setting mode” starts when the user inputs a delay time
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setting command to the operation input unit 160.
Thus, when the “delay time setting mode” is started, first, in step S11 of FIG. 9, estimation
processing of the background noise amount level is performed.
[0070]
In the background noise amount level estimation process, first, the control unit 253 in the
control processing unit 111 which receives the delay time setting command as the operation
input data IPD starts estimation of the background noise estimation unit 251 in the control
processing unit 111. Send commanded NMR.
The background noise estimation unit 251 having received the estimation start instruction NMR
collects the sound collection result data AAD over a predetermined time period TNM. The start
time of the collection period of the sound collection result data AAD by the background noise
estimation unit 251 is set to time T1, and the end time is set to time T2 (see FIG. 11).
[0071]
Next, the background noise estimation unit 251 calculates the sound collection volume at each
time based on the collected sound collection result data AAD. Subsequently, the background
noise estimation unit 251 statistically processes the collected sound volume at each time to
calculate the background noise amount level PD. In the present embodiment, the background
noise estimation unit 251 calculates the average value of the sound collection volume at each
time as the background noise amount level PD.
[0072]
Thus, when the calculation of the background noise amount level PD is completed, the
background noise estimation unit 251 sends the calculated background noise amount level PD to
the delay measurement unit 252 as the background noise notification signal DNL, and the
background noise amount level is estimated. The end is reported to the control unit 253 as an
estimated end report NMP. After this, the process of step S11 ends.
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[0073]
Next, in step S12, setting processing of a signal path for delay measurement is performed for the
sound output unit to be first measured. In the signal path setting process in step S12, the control
unit 253 that has received the estimation end report NMP determines that the sound output unit
(for example, the sound output unit 130C) to be the first measurement target in the signal
selection unit 114. Sends to the signal selection unit 114 an output selection instruction ODS that
establishes conduction between the B terminal and the C terminal of the switch element
corresponding to the other and specifies that the C terminals of the other switch elements do not
conduct to either the A terminal or the B terminal. .
[0074]
Next, in step S13, a delay measurement process is performed. In this delay measurement process,
as shown in FIG. 10, first, in step S21, the control unit 253 sends a test signal generation
command SGC specifying a sound output unit to be measured to the test signal generation unit
115, The delay measurement start command DMR is sent to the delay measurement unit 252.
[0075]
The test signal generation unit 115 that has received the test signal generation instruction SGC
generates a test voice signal GSS corresponding to the designated sound output unit, and sends it
to the signal selection unit 114. As a result, the test sound is output from the sound output unit
to be initially measured.
[0076]
The output start time of the test voice is set to time T3 (see FIG. 11). Further, the time at which
the output volume of the test voice is maximum is taken as time T4 (see FIG. 11).
[0077]
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On the other hand, in the delay measurement unit 252 that has received the delay measurement
start command DMR, the subtraction unit 261 takes in the sound collection result data AAD from
the sound collection unit 140 in step S22. Subsequently, the subtracting unit 261 calculates the
volume PA (t) (at this stage, t = T3) at the sound collecting position at each time based on the
collected sound collection result data AAD.
[0078]
Next, in step S23, the subtraction unit 261 subtracts the background noise amount level PD
notified from the background noise estimation unit 251 as the background noise notification
signal DNL from the calculated volume PA (t) to obtain the corrected volume CPA (t Calculate).
The corrected volume CPA (t) thus calculated is temporarily stored by the subtracting unit 261.
[0079]
Next, in step S24, the subtraction unit 261 determines whether a predetermined time TDM has
elapsed since the start of loading of the sound collection result data AAD. If the result of this
determination is negative (step S24: N), the process returns to step S22. Thereafter, the process
of steps S22 to S24 is repeated until the result of the determination in step S24 is affirmative. A
time when a predetermined time TDM has elapsed from time T3 is taken as time T5 (see FIG. 11).
[0080]
If the predetermined time TDM has elapsed from time T3 to become time T5 and the result of the
determination in step S24 is affirmative (step S24: Y), the subtracting unit 261 temporarily stores
the correction volume CPA (t) (T3 ≦ t ≦ T5) is reported to the threshold time identification unit
262. Thereafter, the process proceeds to step S25.
[0081]
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In step S25, the threshold time specifying unit 262 performs a process of specifying the
threshold time TT. In the process of specifying the threshold time TT, the threshold time
specification unit 262 first calculates the total time integral value EGT of the corrected volume
CPA (t) (T3 ≦ t ≦ T5) (see FIG. 11). Subsequently, the threshold time specifying unit 262
calculates the threshold value ETH by multiplying the total time integral value EGT by the abovedescribed predetermined ratio C (see FIG. 11). Then, the threshold time specifying unit 262
specifies the time when the time integral value REG (t) from the time T3 of the correction volume
CPA (t) becomes the threshold ETH as the threshold time TT (see FIG. 11).
[0082]
When the specification of the threshold time TT ends, the threshold time specification unit 262
sends the corrected volume CP (t) (T3 ≦ t ≦ TT) as the specification result IDR to the delay
estimation unit 263. After this, the process of step S25 ends.
[0083]
Next, in step S26, the delay estimation unit 263 estimates the propagation delay time TTD of the
test sound from the speaker to which the test sound is output to the sound collection position. In
estimating the propagation delay time TTD, first, the delay estimation unit 263 obtains a time TR
at which the volume value is maximum in the corrected volume CP (t) (T3 ≦ t ≦ TT) received as
the specific result IDR. Subsequently, in step S27, the delay estimation unit 263 estimates that
the time from time T4 to time TR is the propagation delay time TTD of the test sound from the
speaker to which the test sound is output to the sound collection position. Then, the delay
estimation unit 263 reports the end of the delay measurement and the measurement result TTD
to the control unit 253 as a measurement result DMP. Thus, when the measurement of the
propagation delay time related to the first sound output unit to be measured is completed, the
process of step S13 is completed, and the process proceeds to step S14 of FIG.
[0084]
In step S14, the control unit 253 having received the measurement result DMP determines
whether or not the delay measurement on all the sound output units 130C to 131SW is
completed. If the result of this determination is negative (step S14: N), the process proceeds to
step S15.
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[0085]
In step S15, setting processing of a signal path for delay measurement is performed for the
sound output unit to be measured next. In the signal path setting process in step S15, the control
unit 253 controls the B terminal and the C terminal of the switch element corresponding to the
sound output unit (for example, the sound output unit 130L) to be the next measurement target
in the signal selection unit 114. And sends to the signal selection unit 114 an output selection
instruction ODS specifying that the C terminal of the other switch element is not conductive to
either the A terminal or the B terminal.
[0086]
When the process of step S15 ends, the process returns to step S13. Thereafter, the processes of
steps S13 to S15 are repeated until the result of the determination in step S15 is affirmative.
[0087]
When the delay measurement for all the sound output units 130C to 130SW is completed and
the result of the determination in step S14 is affirmative (step S14: Y), the process proceeds to
step S16. In step S16, the control unit 253 analyzes the delay measurement results on the sound
output units 130C to 130SW, and calculates the delay times DLC to DLSW of the sound output
data signals AODC to AODSW supplied to the sound output units 130C to 130SW. Do. Then, the
control unit 253 stores the calculation result inside and sends it to the delay unit 230 as a delay
control command DLC.
[0088]
Thus, when the process of step S16 is completed, the control unit 253 directs the signal selection
unit 114 to specify that the A terminal and the C terminal should be electrically connected for all
of the switch elements 241C to 241SW. Are sent to the signal selection unit 114. As a result, the
adjusted volume signals CVDC to CVDSW from the volume adjustment unit 113 are supplied to
the sound output units 130C to 130SW as the sound output data signals AODC to AODSW
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through the signal selection unit 114. Thus, when the “delay time setting mode” is ended, the
control unit 253 and hence the acoustic device 100 resume the operation of the “reproduction
mode”.
[0089]
At the time of the “reproduction mode”, the control unit 253 causes the display unit 150 to
display a guidance screen for supporting specification of content to be reproduced by the user.
Then, when a playback instruction specifying playback content is input to the operation input
unit 160, the control unit 253 controls the drive unit 120 to control data reading of the playback
content.
[0090]
Further, in the “reproduction mode”, the control unit 253 controls frequency characteristic
correction of the channel signals LDC, LDL, LDR, LDSL, LDSR, LDSW included in the content data
signal CTD from the drive unit 120. At the time of control of this frequency characteristic
correction, control unit 253 refers to data signal SST in the middle stage of frequency
characteristic correction from frequency characteristic correction unit 220 to generate frequency
characteristic correction command FCC and sends it to frequency characteristic correction unit
220. .
[0091]
Further, at the time of the “reproduction mode”, the control unit 253 controls the volume
adjustment unit 114 to adjust the output sound volume from the speakers 131C to 131SW of the
sound output units 130C to 130SW. When controlling the output volume, the control unit 253
generates a volume adjustment instruction VLC based on the volume specification input to the
operation input unit 160 and the noise level obtained from the sound collection result by the
sound collection unit 140, and adjusts the volume. Send to section 114.
[0092]
Under the control of the control unit 253 in the above-described “reproduction mode”, the
sound content is reproduced, and the reproduced sound is provided to the listener who is the
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user of the audio device 100.
[0093]
As described above, in the present embodiment, the background noise amount level at the sound
collection position is estimated, and the estimated background noise amount level is subtracted
to calculate the correction volume.
Subsequently, a threshold time at which the time integral value of the corrected volume after the
output of the test speech reaches a predetermined threshold is specified. Then, in the period
from the output of the test voice to the threshold time, the time at which the correction volume
becomes maximum is estimated as the arrival time of the direct wave of the test voice to the
sound collection position. Based on the estimation result of the arrival time, the propagation
delay time from the speaker outputting the test voice to the sound collection position is
estimated.
[0094]
Therefore, it is possible to perform delay time measurement useful for accurately synchronizing
the audio of each channel at the listening position. As a result, according to the present
embodiment, it is possible to accurately synchronize the audio of each channel at the listening
position while adopting the multi-channel method.
[0095]
[Modification of Embodiment] The present invention is not limited to the above embodiment, and
various modifications are possible.
[0096]
For example, in the above embodiment, the drive unit 120 is a CD drive unit, but may be a fixed
disk or a DVD drive unit.
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Furthermore, broadcast wave reception circuits such as radio broadcasts and terrestrial digital
television broadcasts, audio input circuits of external devices, and the like can also be used.
[0097]
Moreover, in said embodiment, although the 1-way speaker system was assumed about the
speaker in each sound output unit, a 2-way speaker system and a 3-way speaker system can also
be employ | adopted in each sound output unit.
[0098]
In the above embodiment, the 5.1 ch surround system is adopted and six sound output units are
provided. However, audio signals which are the result of reading the sound content are
appropriately separated or mixed, and not more than five or six It is possible to output sound
from one or more speakers.
[0099]
In the above embodiment, it is assumed that the volume has a dimension of power, but instead of
the power, an absolute value or an effective value of the sound pressure can be processed as the
volume.
[0100]
Further, in the above embodiment, the threshold value ETH is calculated by multiplying the total
time integral value EGT of the correction volume CPA (t) (T3 ≦ t ≦ T5) by a predetermined ratio
C.
On the other hand, the total volume of the test sound may be determined in advance, and the
total volume of the test sound may be multiplied by a separately determined constant to calculate
the threshold value ETH.
[0101]
A central processing unit (CPU: Central Processing Unit), DSP (Digital Signal Processor), read only
memory (ROM: Read Only Memory), random access memory (RAM) Even if a part of the
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processing in the above embodiment is executed by configuring a computer as an arithmetic unit
provided with a random access memory or the like and executing a prepared program by the
computer. Good.
This program is recorded on a computer-readable recording medium such as a hard disk, a CDROM, a DVD, etc., and is read from the recording medium and executed by the computer.
Also, this program may be acquired in the form of being recorded on a portable recording
medium such as a CD-ROM, a DVD or the like, or may be acquired in the form of delivery via a
network such as the Internet. It is also good.
[0102]
FIG. 1 is a block diagram schematically showing a configuration of an acoustic device according
to an embodiment. It is a figure for demonstrating the arrangement position of six speakers of
FIG. It is a block diagram for demonstrating the structure of the control unit of FIG. It is a block
diagram for demonstrating the structure of the channel signal processing part of FIG. It is a block
diagram for demonstrating the structure of the signal delay part of FIG. It is a block diagram for
demonstrating the structure of the signal selection part of FIG. It is a block diagram for
demonstrating the structure of the control processing part of FIG. It is a block diagram for
demonstrating the structure of the delay measurement part of FIG. It is a flowchart for
demonstrating the delay time setting process by the apparatus of FIG. It is a flowchart for
demonstrating the delay measurement process in FIG. It is a figure for demonstrating the
waveform and timing in the time of a delay time setting process.
Explanation of sign
[0103]
DESCRIPTION OF SYMBOLS 100 ... Sound apparatus 112 ... Channel signal processing part
(adjustment means) 115 ... Test signal generation part (test sound generation means) 131C131SW ... Speaker 140 ... Sound collection unit (sound collection means) 230 ... Delay part (delay
means) 251 ... background noise estimation unit (background noise estimation unit) 261 ...
subtraction unit (subtraction unit) 262 ... threshold time specification unit (specification unit)
263 ... delay estimation unit (delay estimation unit) CR ... vehicle (moving object)
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