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JP2014171198

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DESCRIPTION JP2014171198
Abstract: To provide an audio signal processing apparatus capable of performing performance
evaluation of a delay correction function with a simpler configuration. An audio signal processing
apparatus according to the present invention includes a transmitter configured to transmit a first
audio signal and a second audio signal transmitted with a predetermined time difference with
respect to the first audio signal. Further, it has a time difference determination unit that
determines the predetermined time difference according to the distance between the audio
output device and the predetermined position. Moreover, it has a time difference detection part
which detects the time difference of a said 1st audio | voice signal and a said 2nd audio | voice
signal. Moreover, the evaluation part which evaluates the difference of the said predetermined
time difference and the time difference detected by the said time difference detection part is
provided. [Selected figure] Figure 2
Audio signal processing device
[0001]
The present invention relates to an audio signal processing device that transmits audio signals to
a plurality of audio output devices.
[0002]
In recent years, a multi-channel audio signal processing apparatus such as a home theater
apparatus has been used as an audio signal processing apparatus that receives digital audio
signals and digital image signals, performs predetermined processing (for example, sampling and
quantization), and transmits audio signals. It has been put to practical use.
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1
[0003]
Among such multi-channel audio signal processing devices, there is one having a delay correction
function to correct the output delay of audio generated due to the distance between the audio
output device etc. and the audio signal processing device. .
In the delay correction function, for example, according to the distance from the audio signal
processing apparatus which is the transmission source of the audio signal to each audio output
apparatus, the audio signal transmission timing at the transmission source is provided with a
time difference for each channel.
Delay correction is performed by the provided time difference.
[0004]
However, there may be variations in the accuracy of the delay correction due to individual
differences among the audio signal processing devices. For this reason, it is necessary to measure
the time difference of the audio signal transmission timing of each channel, and to evaluate
whether this time difference is appropriately provided.
[0005]
Conventionally, in order to perform the above evaluation, an evaluation disk, an oscilloscope or
the like has been used. More specifically, a setting indicating the distance between the audio
output device and the audio signal processing device (hereinafter referred to as "distance
setting") is set in the audio signal processing device, and the evaluation signal is reproduced in
the audio signal processing device. Visually check the output waveform obtained from the
resistor connected to the audio output device with an oscilloscope. By checking the output
waveform a plurality of times by changing the distance setting, it is evaluated whether or not the
delay correction at each distance setting is appropriately performed.
[0006]
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2
In relation to the above, Patent Document 1 outputs a pulse signal to a speaker, detects a
response time until receiving a response pulse signal to the pulse signal, and calculates a
separation distance from the speaker based on the response time. An acoustic system is
disclosed.
[0007]
Unexamined-Japanese-Patent No. 2006-54515
[0008]
However, in the conventional evaluation method, hardware such as a detection circuit is required
to measure the time difference of each channel, and there is a problem that the audio signal
processing device alone can not perform the evaluation.
Moreover, in the evaluation method by visual confirmation using an oscilloscope etc., while it
takes time for evaluation in a model (for example, a model which can be set in several tens of
centimeters) where distance setting can be set very finely, evaluation error tends to occur. There
was a problem that.
[0009]
An object of the present invention is an audio signal processing device that transmits audio
signals to a plurality of audio output devices, and provides an audio signal processing device
capable of performing performance evaluation of a delay correction function with a simpler
configuration. It is.
[0010]
In order to achieve the above object, an audio signal processing apparatus according to the
present invention includes a transmitter configured to transmit a first audio signal and a second
audio signal transmitted with a predetermined time difference with respect to the first audio
signal. A time difference determination unit that determines the predetermined time difference
according to a distance between the audio output device and a predetermined position; a time
difference detection unit that detects a time difference between the first audio signal and the
second audio signal; An evaluation unit that evaluates the difference between the time difference
and the time difference detected by the time difference detection unit is configured (first
configuration).
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[0011]
According to this configuration, the performance evaluation of the delay correction function can
be performed only by the audio signal processing device without requiring an evaluation device
connected to the audio output device or the like.
[0012]
Further, in the audio signal processing device of the first configuration, the time difference
detection unit includes a volatile recording medium, and the first audio signal detection flag and
the second audio signal detection flag of the volatile recording medium It is preferable to set it as
the structure (2nd structure) which detects the time difference of a said 1st audio signal and a
said 2nd audio signal using these.
[0013]
According to such a configuration, the time difference between the first audio signal and the
second audio signal can be detected with a simple configuration.
[0014]
Further, in the audio signal processing device of the second configuration, when the time
difference detection unit detects that the first audio signal is input, the flag for detecting the first
audio signal of the volatile recording medium is set. Preferably, when it is detected that the
second audio signal is input, a flag for detecting a second audio signal of the volatile recording
medium is set (third configuration).
[0015]
According to such a configuration, the time difference between the first audio signal and the
second audio signal can be easily made using the time when the first audio signal detection flag
is set and the time when the second audio signal detection flag is set. It can be calculated.
[0016]
Further, in the audio signal processing device according to any one of the first to third
configurations, the time difference determination unit adjusts the predetermined time difference
based on an evaluation result of the evaluation unit (fourth configuration). It is preferable to do.
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[0017]
According to such a configuration, not only the performance evaluation of the delay correction
function but also adjustment of the delay correction can be performed when the delay correction
is not properly performed, and the delay correction can be appropriately performed.
[0018]
Further, the audio signal processing device according to any one of the first to third
configurations includes an input unit that receives an input of information related to the distance
between the audio output device and the predetermined position (fifth configuration). Is
preferred.
[0019]
According to such a configuration, it is not necessary for the audio signal processing device itself
to detect the distance between the audio output device and the predetermined position.
[0020]
According to the present invention, performance evaluation of the delay correction function can
be performed with a simpler configuration.
In addition, since the evaluator does not have to learn complicated evaluation operations, the
evaluation time can be shortened and evaluation errors due to human errors can be reduced.
[0021]
It is a block diagram which shows the structure of the audio | voice signal processing apparatus
of this invention.
It is a flowchart which shows the evaluation process of this invention.
It is a screen figure which shows the evaluation process screen of this invention.
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It is a screen figure which shows the evaluation process screen of this invention.
It is a screen figure which shows the evaluation process screen of this invention.
[0022]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings.
The embodiment shown here is an example, and the present invention is not limited to the
embodiment shown here.
[0023]
〈1.
Regarding Internal Configuration> FIG. 1 is a configuration diagram showing an audio apparatus
1 (= an example of an audio signal processing apparatus) according to an embodiment of the
present invention.
The audio apparatus 1 includes an MCU (Micro Control Unit) 10 (= an example of a transmitting
unit, a time difference determining unit, and an evaluating unit), a DSP (Digital Signal Processor)
20 (an example of a time difference detecting unit), a PWM processor 30, and a D-AMP 40. , And
a memory 50.
In the present embodiment, as external devices connected to the D-AMP 40, the center speaker
3C, the front left speaker 3FL, the front right speaker 3FR, the rear left speaker 3RL, and the rear
right speaker 3RR, There is a speaker 3SW (= an example of an audio output device) for the
subwoofer.
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In the following description, the center speaker 3C is referred to as the center speaker, the front
left speaker 3FL and the front right speaker 3FR are referred to as the front speakers, and the
rear left speaker 3RL and the rear right speaker 3RR are surround rear speakers. And the
speaker 3SW for the subwoofer may be called a subwoofer.
[0024]
The MCU 10 is an integrated circuit having a function as a decoder.
The digital signal read from the optical disc 2 by the optical disc device (not shown) is input to
the MCU 10.
The MCU 10 decodes this digital signal to generate a predetermined digital audio signal (I2S
signal in the present embodiment), and outputs the signal to the DSP 20.
[0025]
Further, the MCU 10 has a function of transmitting and receiving a control signal (I2C signal in
the present embodiment) for adjusting the volume and transmission timing of the audio signal
with the DSP 20 and the PWM processor 30.
[0026]
The DSP 20 receives an I2S signal for each speaker, performs predetermined digital audio
processing, and outputs the processed signal to the PWM processor 30.
The DSP 20 also has a register 21 which is a volatile recording medium.
[0027]
The PWM processor 30 converts the signal provided by the DSP 20 into a PWM signal. The DAMP 40 amplifies the PWM signal input from the PWM processor 30 and outputs it to each
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speaker.
[0028]
The memory 50 is, for example, a non-volatile storage medium such as a flash memory. In this
embodiment, it is used for recording the evaluation result which MCU10 and DSP20 which were
mentioned above implemented.
[0029]
The MCU 10 of the present embodiment has a delay correction function of correcting the output
delay of the sound according to the distance between the audio apparatus 1 and the
predetermined position. More specifically, the MCU 10 changes the timing of outputting the I2S
signal from the MCU 10 to the DSP 20 in accordance with which speaker the I2S signal is for.
[0030]
For example, the transmission timing of the I2S signal (= first audio signal) for the front speaker
is used as a reference timing, and the I2S signal (= second audio signal) for the surround rear
speaker or the I2S signal (= second audio) for the center speaker Signal) and an I2S signal for the
subwoofer (= second audio signal) are transmitted with a predetermined time difference from the
reference timing.
[0031]
Therefore, the DSP 20 receiving the I2S signal receives a plurality of I2S signals with a
predetermined time difference.
[0032]
There are various ways of setting the predetermined time difference, but three examples will be
described here.
First Embodiment In the first embodiment, the value of the predetermined time difference is a
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final output target of an audio signal to which a predetermined time difference from the audio
apparatus 1 is given for each speaker excluding the front speakers and It is decided according to
the distance of
The distance setting indicating the distance between the audio device 1 and the speaker that is
the target of the final output target of the audio signal having a predetermined time difference
can be changed by the user setting for each speaker excluding the front speaker. Therefore, the
audio apparatus 1 is provided with an input unit (not shown) that receives an input of user
setting. Second Embodiment In the second embodiment, the value of the predetermined time
difference is the front speaker for each speaker excluding the front speaker and the speaker that
is the target of the final output of the audio signal that adds the predetermined time difference. It
is decided according to the distance. The distance setting indicating the distance between the
front speaker and the speaker that is the target of the final output target of the audio signal
having a predetermined time difference can be changed by user setting for each speaker
excluding the front speaker. Third Embodiment In the third embodiment, the value of the
predetermined time difference is the final output of the audio signal in which the distance
between the front speaker and the user position and the predetermined time difference are
provided for each speaker excluding the front speaker. It is determined according to the distance
between the target speaker and the user position. In addition, the distance setting that indicates
the distance between the front speaker and the user position for each speaker excluding the front
speaker and the distance setting that indicates the distance between the speaker that is the final
output target of the audio signal and the user position It can be changed by user setting for each
speaker except the front speaker.
[0033]
Further, the MCU 10 of the present embodiment has an automatic measurement and evaluation
function for evaluating whether or not the above-mentioned delay correction function operates
normally. This automatic measurement evaluation function is performed in conjunction with the
DSP 20.
[0034]
The DSP 20 of the present embodiment detects a test tone (for example, a sine wave) input from
the MCU 10 by being controlled by a test program executed by the MCU 10. Control from the
MCU 10 to the DSP 20 is performed using an I2C signal which is a control signal.
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[0035]
By this control, the DSP 20 enables the front detection flag of the register 21 when detecting that
the test tone for the front speaker has been input. Similarly, when the test tone for the surround
rear speaker is detected, the surround rear detection flag is enabled, and when the test tone for
the center speaker is detected, the center detection flag is enabled to test the subwoofer. When a
tone is detected, the subwoofer detection flag is enabled.
[0036]
The MCU 10 monitors the plurality of detection flags, and calculates a time difference between
the times at which each detection flag becomes valid. Then, it is determined whether the
calculated time difference matches the expected value (= predetermined time difference). If it
agrees with the expected value, it is evaluated that the delay correction is made correctly, and if
not, it is evaluated that the delay correction is not made correctly. The MCU 10 displays the
evaluation result on a display (not shown) or the like.
[0037]
〈2. Automatic Measurement and Evaluation> Next, automatic measurement and evaluation,
which is an evaluation process performed by the audio device 1 of the present embodiment, will
be described with reference to the drawings. Here, in order to clarify the difference between the
present invention and the prior art, conventional evaluation processing and its problems will be
described.
[0038]
Conventionally, an optical disc 2 for evaluation was attached to the audio apparatus 1, a resistor
was connected to each speaker 3, and visual confirmation was performed by an oscilloscope. For
example, a first resistor is connected to the front speaker, and a second resistor is connected to
the surround rear speaker. Then, CH1 of the oscilloscope is connected to the first resistor, CH2 is
connected to the second resistor, and setting of the oscilloscope is performed.
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[0039]
Next, after setting the distance for which the speaker distance is to be evaluated from the setting
screen of the audio device 1, the start / stop key of the oscilloscope is pressed. In this state, the
audio apparatus 1 reproduces the evaluation disc. Then, on the screen of the oscilloscope, the
time difference between the rising of CH1 and the rising of CH2 is calculated from the signal
waveform at the time of reproduction. The calculation of this time difference is performed for
each speaker with reference to the front speaker.
[0040]
As described above, conventionally, since it is necessary to prepare and connect an evaluation
device such as an oscilloscope or a resistor outside the audio device 1, there is a problem that the
audio device 1 alone can not perform the evaluation. Further, since visual confirmation using an
oscilloscope or the like is necessary, for example, in a model capable of setting a very fine
distance, evaluation takes a long time and there is a problem that an evaluation error easily
occurs.
[0041]
Therefore, in the present embodiment, the automatic measurement evaluation of the delay
correction function is performed only inside the audio apparatus 1 using the test tone (= I2S
signal) output from the MCU 10 and the I2S signal detection function of the DSP 20. FIG. 2 is a
flow chart showing the processing flow of this automatic measurement evaluation.
[0042]
When the audio apparatus 1 detects an instruction to enter the measurement mode for
performing automatic measurement evaluation, it displays the evaluation screen 91 shown in
FIG. 3 on the display (not shown), and then the user operates the predetermined key (enter in the
example of FIG. Wait for the key) to be pressed. When the predetermined key is pressed in this
state, the processing flow shown in FIG. 2 is started. When the process is started, the MCU 10
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displays an evaluation screen 92 shown in FIG. The display of the in-evaluation screen 92 is
continuously performed until the end of the evaluation.
[0043]
First, in step S110, the MCU 10 sets the distance of the speaker to be tested to 1 msec. The
distance setting: 1 msec is a distance estimated to cause a delay of 1 msec in voice output, and in
this embodiment, it is about 1 foot (about 0.3 m). That is, if the distance setting is 2 msec, it will
be about 2 feet. In the case where a predetermined time difference is given according to the first
embodiment or the second embodiment described above, one kind of distance setting may be
performed in step S110 as described above, but according to the third embodiment described
above In the case where a predetermined time difference is attached, two types of distance
setting are performed in step S110 unlike the above description.
[0044]
Next, in step S120, the MCU 10 transmits a sine wave test tone for outputting a test sound from
the front speaker as the reference speaker and the surround rear speaker as the evaluation target
speaker.
[0045]
Next, in step S130, the MCU 10 controls the DSP 20 to individually monitor the input of the
plurality of test tones output from the MCU 10.
By this control, the DSP 20 enables the detection flag of the register 21 when the input of the
test tone is detected.
[0046]
Next, in step S140, the MCU 10 monitors the register 21 to calculate a time difference between
the time when the front detection flag is set and the time when the surround rear detection flag
is set.
[0047]
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And evaluation is performed by comparing the calculated time difference and the expected value.
If the result matches the expected value, for example, if the error is within ± 100 μsec, the
evaluation is considered OK. If it does not match the expected value, for example, if the error
exceeds ± 100 μsec, the evaluation is judged as NG.
[0048]
Next, in step S150, the MCU 10 records the above evaluation result in the memory 50. Next, in
step S160, the MCU 10 determines whether the evaluation of all the speakers except the front
speaker has been completed at the current distance setting.
[0049]
If not completed, in step S161, the speaker to be evaluated is changed, and then the process
proceeds to step S120. As a result, for example, evaluation is performed in which the speaker to
be tested is changed to the center speaker.
[0050]
If the evaluation of all the speakers has been completed with the current distance setting, the
MCU 10 determines in step S170 whether the evaluation in the all distance setting has been
completed. If not completed, the distance setting is increased by a predetermined distance (for
example, 1 msec) in step S171, and then the process proceeds to step S120. Thus, for example,
evaluation is performed with the distance setting set to 2 msec.
[0051]
When the evaluation in the all distance setting is completed, the MCU 10 determines that all the
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evaluations are completed in step S180, and generates and outputs an image indicating the
evaluation result. Thereby, the measurement result display screen 93 shown in FIG. 5 is
displayed on a display (not shown). When the display is completed, this processing ends.
[0052]
According to the present embodiment described above, the automatic measurement evaluation of
the delay correction function is performed only by the device inside the audio apparatus 1 and
the software control without the need for evaluation hardware such as a resistor or an
oscilloscope. Can.
[0053]
Therefore, automatic measurement and evaluation can be performed with a simple device
configuration.
In addition, since the evaluator does not need to learn complicated evaluation operations or
check the evaluation manual, the evaluation time can be shortened, the evaluation error due to
human error can be reduced, and the evaluation quality can be improved. .
[0054]
[Other Embodiments] Although the present invention has been described above by citing
preferred embodiments and examples, the present invention is not necessarily limited to the
above embodiments and examples, and the technical idea of the present invention is not limited
thereto. Various modifications may be made within the scope.
[0055]
Therefore, the present invention is also applicable to, for example, the following embodiments.
[0056]
(A) In the above embodiment, the audio apparatus 1 which is a home theater apparatus is
illustrated as an audio signal processing apparatus to which the automatic measurement and
evaluation method of the present invention is applied. However, a plurality of audio output
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apparatuses are connected to correct an audio output delay The audio signal processing
apparatus according to the present invention may be applied to any other audio signal
processing apparatus as long as it is an audio signal processing apparatus provided with the
following function.
For example, the automatic measurement and evaluation of the present invention may be applied
to an audio signal processing apparatus such as an HDD player, a large-sized television, or an
amplifier.
[0057]
(B) In the above embodiment, although notification is made when the time difference does not
match the expected value, that is, when the delay correction is not properly performed, the MCU
10 outputs an output signal to the surround rear speaker, the center speaker, or the subwoofer.
When the delay correction amount is increased or decreased, the delay correction amount may
be increased or decreased based on the evaluation result, that is, the predetermined time
difference may be adjusted based on the evaluation result.
Thereby, adjustment of delay correction can be performed appropriately.
[0058]
DESCRIPTION OF SYMBOLS 1 audio apparatus (an example of an audio signal processing
apparatus) 2 optical disk 3C, 3FL, 3FR, 3RL, 3RR, 3SW Speaker (an example of an audio output
apparatus) 10 MCU (an example of a transmission part, a time difference determination part, an
evaluation part) Example of time difference detection unit) 21 registers 30 PWM processor 40 DAMP 50 memory
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