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JP2010010823

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DESCRIPTION JP2010010823
The present invention provides an acoustic characteristic correction method and apparatus
capable of easily measuring acoustic characteristics of a sound field. In an acoustic characteristic
correction device having a main body (10) for reproducing an acoustic signal and a wireless
remote control (50) having a microphone (52), the main body (10) generates a measurement
acoustic signal. (26), a frequency characteristic calculation unit (18) for obtaining an acoustic
characteristic from a sound collection signal of the reproduction sound of the measurement
acoustic signal transmitted from the remote control (50), a correction characteristic calculation
unit for obtaining a correction coefficient from the acoustic characteristic And a convolution unit
(22) for correcting an acoustic signal based on the calculated correction coefficient. [Selected
figure] Figure 1
Acoustic characteristic correction method and apparatus
[0001]
The present invention relates to correction of acoustic characteristics of a reproduction system
including a sound field such as the shape of a room in which a listener is located.
[0002]
The sound reproduced by the speaker causes phase interference between the reflected waves
from the ceiling, floor, wall and the like in the room, so that depending on the listening position,
extreme peak dip occurs, giving the listener an unpleasant feeling of hearing.
[0003]
08-05-2019
1
As a conventional technique for correcting the acoustic characteristics of a reproduction system
including such a sound field, there is an acoustic characteristic correction device described in
Patent Document 1.
This device comprises a main unit, a remote control unit and a microphone, and the main unit
and the remote control unit are connected via a signal cable.
The microphone is disposed at a listening position in a room where music is reproduced, and is
connected to the microphone input terminal of the main unit. In the main unit, a measurement
signal such as a band signal or a time extension pulse signal is generated, and is reproduced from
a speaker used for reproduction through a power amplifier. The microphone collects the
reproduced sound of the measurement signal, and the sound collecting form is taken into the
memory in the main unit. This measurement is performed at each position by moving the
microphone to a plurality of points (for example, five points) centered on the listening position as
necessary. The response characteristic is calculated based on the sound collection signal
captured in the memory. The obtained response waveform is displayed as a bar graph on the
display unit of the remote control unit, and the listener sets desired characteristics while looking
at this display. The set desired characteristics are displayed as a line graph superimposed on the
determined response characteristics, and the corrected characteristics are also displayed as a line
graph. Therefore, in order to obtain the desired corrected characteristics, You can see at a glance
if it should be done, it is easy to set. The correction characteristic is calculated so that the
response characteristic matches the desired characteristic, and the acoustic signal for
reproduction is reproduced through the correction characteristic, whereby the acoustic signal is
reproduced in a state adjusted to the desired characteristic.
[0004]
However, it is necessary to install a microphone at the measurement point for each measurement
of each point and to connect the microphone to the main body by cable, which makes the device
configuration complicated. Furthermore, a remote control unit for setting desired characteristics
is also connected to the main unit by a cable, and the device configuration is complicated. Patent
No. 3147618 (Paragraphs [0018] to [0021])
[0005]
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2
As described above, the conventional acoustic characteristic correction device can not easily
measure the acoustic characteristic of the sound field.
[0006]
An object of the present invention is to provide an acoustic characteristic correction method and
apparatus capable of easily measuring the acoustic characteristic of a sound field.
[0007]
According to an aspect of the present invention, there is provided an acoustic characteristic
correction apparatus comprising: a main body configured to reproduce an acoustic signal; and a
wireless remote control having a microphone, wherein the main body generates a measurement
acoustic signal; Means for receiving a sound collection signal transmitted from the device, means
for obtaining an acoustic characteristic from the sound collection signal of the reproduction
sound of the measurement acoustic signal received by the receiving means, and means for
obtaining a correction characteristic from the acoustic characteristic And means for correcting an
acoustic signal based on the correction characteristic.
[0008]
According to one aspect of the present invention, there is provided an acoustic characteristic
correction method for an acoustic device, comprising: a main body configured to reproduce an
acoustic signal; and a wireless remote control having a microphone, the step of generating an
acoustic signal for measurement from the main body. The step of receiving the sound collection
signal transmitted from the remote control by the body, the step of determining an acoustic
characteristic from the sound collection signal of the reproduction sound of the received
measurement acoustic signal, and determining the correction characteristic from the acoustic
characteristic The method may include the steps of: correcting the acoustic signal based on the
correction characteristic.
[0009]
As described above, according to the present invention, by adding the microphone to the wireless
remote controller, it is possible to easily correct the acoustic characteristics to the optimum
acoustic characteristics according to the listening environment simply by the listener operating
the remote controller. .
[0010]
Hereinafter, embodiments of the acoustic characteristic correction method and apparatus
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3
according to the present invention will be described with reference to the drawings.
[0011]
FIG. 1 is a diagram showing the configuration of an acoustic characteristic correction device
according to a first embodiment of the present invention.
The acoustic characteristic correction device comprises a main body 10 and an infrared remote
control 50.
The remote controller 50 is not limited to the remote controller using infrared light, but may be
another format as long as it is wireless, such as one using a short distance wireless
communication system.
The main body 10 is an apparatus having an audio signal reproducing function such as a
television receiver or a stereo device that reproduces an audio signal that a listener listens to, and
the remote control 50 is for various operations of the main body 10. An operation signal for stop
instruction, volume adjustment and the like is transmitted to the main body 10 by infrared
communication.
The main body 10 has a function of reproducing and outputting a signal for measuring acoustic
characteristics of a room (sound field) in which the listener is located.
The remote control 50 incorporates a microphone for collecting the reproduced sound of the
measurement signal.
The reproduction signal of the collected measurement signal is transmitted from the remote
control 50 to the main body 10 through infrared communication, is arithmetically processed in
the main body 10, the calculation of the acoustic characteristic of the sound field, the calculation
of the correction characteristic, and the acoustic that the listener listens to Signal correction is
made.
08-05-2019
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[0012]
Specifically, the main body 10 includes the infrared receiving unit 12 that receives the
transmission signal from the remote control 50. Since the transmission signal from the remote
control 50 is modulated, the reception signal is supplied from the reception unit 12 to the
demodulation unit 14 and the reception signal is demodulated. The transmission signal from the
remote control 50 is a digital signal. The transmission signal from the remote control 50 includes
a sound collection signal of reproduced sound of a signal for measuring acoustic characteristics
collected by a microphone with a built-in remote control, and an operation instruction signal
(acoustic characteristic correction start signal or the like) to the main body 10. The sound
collection signal is supplied from the demodulator 14 to the memory 16 and stored in the
memory 16.
[0013]
The frequency characteristic calculation unit 18 calculates the frequency characteristic of the
sound field from the large number of sound collection signals stored in the memory 16. The
correction characteristic calculation unit 20 calculates a correction characteristic for correcting
the peak-dip included in the frequency characteristic of the sound field calculated by the
frequency characteristic calculation unit 18. The correction characteristic is a tap coefficient of
an FIR (finite impulse response) filter which is obtained by inverse Fourier transform of the
difference between the measured frequency characteristic and the ideal frequency characteristic
not including the peak and dip. The correction characteristic is set in the convolution unit 22
composed of an FIR filter. When the acoustic signal is convoluted with the correction
characteristic in the convolution unit 22, an acoustic signal having ideal frequency characteristics
with peak-dip cancellation is obtained.
[0014]
On the other hand, the acoustic characteristic correction start signal in the operation instruction
signal obtained by the demodulation unit 14 is supplied to the measurement signal generation
unit 26, and a measurement signal for acoustic characteristic measurement is generated. A
monotone signal can be used as the measurement signal.
[0015]
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The main body 10 also includes a reproduction signal generation unit 28 that generates an
acoustic signal for the listener to listen to, and an acoustic signal for listening is generated
according to the operation signal from the remote control 50. The reproduction signal generation
unit 28 may reproduce an acoustic signal from a recording medium such as a CD, an MD, a DVD,
a hard disk, a flash memory or the like, or may separate an acoustic signal from a broadcast
signal. The acoustic signal for listening is supplied to the convolution unit 22 and corrected.
[0016]
One of the outputs of the convolution unit 22, the measurement signal generator 26, and the
reproduction signal generator 28 is supplied to the digital / analog converter 30 via the selector
24. The output of the reproduction signal generator 28 is supplied to the selector 24 as it is
because reproduction may be performed without the need for correction depending on the
acoustic characteristics of the sound field. The output of the digital / analog converter unit 30
outputs reproduced sound through the low pass filter 32, the power amplifier 34, and the
speaker 36.
[0017]
The remote control 50 has a microphone 52 for collecting the sound wave output from the
speaker 36, and the sound collection signal output from the microphone 52 is written to the
memory 58 via the microphone amplifier 54 and the analog / digital conversion unit 56. The
sound collection signal read from the memory 58 is transmitted to the main body 10 via the
modulation unit 60 and the infrared transmission unit 62. The remote control 50 has an
operation unit 66 including an acoustic characteristic correction button, a volume adjustment
button, etc. When the operation unit 66 is operated, an operation signal is output, and the
operation signal is output via the modulation unit 60 and the infrared transmission unit 62. It is
sent to the main unit 10.
[0018]
2 and 3 are flowcharts showing an example of the operation of the acoustic characteristic
correction apparatus shown in FIG. The flow chart is divided into a flow chart on the remote
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control side ((a) in the figure) and a flow chart on the side of the main unit ((b) in the figure). The
operation is roughly divided into (1) reproduction of the acoustic characteristic measurement
signal (main unit), (2) collection of reproduced sound and transmission of the collected signal to
the main unit (remote control), (3) frequency characteristic of sound field Calculation (body), (4)
Calculation of correction coefficient (body), (5) Correction of sound signal to be heard (body).
[0019]
A listener who listens to the sound signal reproduced by the main body 10 keeps the remote control 50 at hand in
order to operate the main body 10. Therefore, the microphone is present at the listening position of the listener
even if the microphone is not intentionally placed at the listening position, so that the acoustic characteristics of
the sound field can be easily measured. When the operation part 66 of the remote control 50 is operated and the
acoustic characteristic correction button (not shown) is pressed (yes in block B102), an acoustic characteristic
correction start signal is output, and this signal is transmitted to the main body 10 in block B104. Be done.
[0020]
When the main body 10 receives the acoustic characteristic correction start signal from the remote control 50
(yes in block B202), a measurement signal (for example, a monotone signal) of a certain frequency is generated.
At this time, the selector selects the measurement signal generator 26. The measurement signal is output as a
reproduced sound from the speaker 36 through the digital / analog converter 30, the low pass filter 32, and the
power amplifier 34 (block B206).
[0021]
The remote controller 50 waits for reproduction of the measurement signal in block B108, and when the
reproduction sound of the measurement signal is detected (yes in block B110), the reproduction sound of the
measurement signal is collected in block B112. At block B114, sound collection data (amplitude value) is stored
in the memory 58. In order to improve the accuracy of the sound collection data, data of several samples (for
example, eight points) are averaged. In block B116, it is determined whether measurement of eight points is
completed. If not, the reproduced sound of the next sample point is collected at block B112, and the sound
collection data after averaging is stored in the memory 58 at block B114. When an average of eight points is
obtained (yes in block B116), the measurement data is modulated by the modulation unit 60 in block B118, and
the modulation data is transmitted to the main body 10 in block B120.
08-05-2019
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[0022]
In the main unit 10, after the signal for measurement is reproduced in block B206, transmission of modulation
data from the remote control 50 is waited in block B208, and when modulation data is received (yes in block
B210), modulation data is demodulated in block B212 It is demodulated at 14. At block B 214, the demodulated
data is stored in the memory 16. This is the end of the measurement of the measurement signal of one frequency.
Since the acoustic characteristics of the sound field need to be measured over the entire frequency band in the
audible range, the above operation is repeated by changing the frequency of the measurement signal. As an
example, the above measurement is repeated by changing the frequency of the monotone signal in steps of 1/12
(oct) in the frequency band from 20 Hz to 20 KHz. The remote control side is repeated from block B108 to
block B120 as shown by blocks B106 and B122, and the main body side is repeated from block B206 to block
B214 as shown by blocks B204 and B216.
[0023]
When the repetition ends in block B122 on the remote control side, the operation ends.
[0024]
When repetition is ended in block B216 on the main body side, the frequency characteristic calculation unit 18
collects collected data of the monotone signal measured in the frequency band from 20 Hz to 20 KHz in steps of
1/12 (oct) stored in the memory 16 The frequency characteristic is determined by aligning (amplitude value) on
the frequency axis and normalizing the amplitude (block B 218).
In block B220, the correction characteristic calculation unit 20 compares the ideal frequency characteristic (flat
characteristic (no peak-dip characteristic in the audio frequency band) or a characteristic arbitrarily set by the
listener) with the measured frequency characteristic. Then, the difference is subjected to inverse Fourier
transform to obtain a correction characteristic (tap coefficient of the FIR filter). The correction characteristic is
set in the convolution unit 22.
[0025]
At block B222, it is determined whether it is time to reproduce the acoustic signal to be heard. If not, the
operation ends. If yes, in block B224, the convolution unit 22 performs a convolution operation on the audio
08-05-2019
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signal received from the reproduction signal generation unit 28 to obtain an acoustic signal having an ideal
frequency characteristic with peak-dip correction. The subsequent acoustic signal is output as a reproduced
sound from the speaker 36 through the digital / analog conversion unit 30, the low pass filter 32, and the power
amplifier 34. It is to be noted that even when the acoustic signal to be listened to is reproduced, there is no need
to make correction if there is no peak dip in the acoustic characteristics of the sound field, so the acoustic signal
from the reproduction signal generator 28 is reproduced as it is via the selector 24. It is good.
[0026]
As a result, the listener can easily measure the acoustic characteristics of the listening field simply by pressing the
acoustic characteristic correction button of the remote control 50 at the listening position, and correct the peak
dip, if any. There is no need to install a microphone at the listening position as described in the background art,
and there is no need to cable the microphone to the main unit, and the operation is simple, just pressing a button
on the remote control. Furthermore, since the remote control is a wireless remote control, cable connection
between the remote control and the main body as described in the background art is unnecessary, and
connection and operation are easy.
[0027]
According to the present embodiment, the remote controller 50 incorporates the microphone 52 in the remote
controller 50, focusing on the point that is always present in the vicinity of the listener. The remote control 50 of
the present embodiment differs from the normal remote control only in that it incorporates a microphone 52 and
a microphone amplifier 54, and the other is the same as a general-purpose remote control attached to the main
unit 10. The added microphone 52 and microphone amplifier 54 do not impose a burden on the improvement
in terms of cost and component size. The processing sharing between the remote control 50 and the main unit 10
takes into consideration the memory capacity, the data communication amount, the battery load, etc., and the
processing with the remote control 50 reduces the size of measurement data as much as possible and keeps it until
storing in the built-in memory 58 . The measured data is transmitted to the main unit 10 by infrared rays, and
calculations with large processing load such as frequency characteristic (acoustic characteristic of sound field)
calculation and correction characteristic calculation are processed in the main unit 10 without affecting the cost
of parts. Characteristic correction (cancellation of peak, dip, etc.) can be performed. The acoustic characteristics
differ depending on the listening position, and also due to environmental changes such as temperature and
humidity. Therefore, if there is a change in the listening environment, the ability to be corrected accordingly has
great merit.
[0028]
08-05-2019
9
The present invention is not limited to the above embodiment as it is, and at the implementation stage, the
constituent elements can be modified and embodied without departing from the scope of the invention. In
addition, various inventions can be formed by appropriate combinations of a plurality of components disclosed
in the above embodiments. For example, some components may be deleted from all the components shown in
the embodiment. Furthermore, components in different embodiments may be combined as appropriate. For
example, in the above description, the measurement signal is a monotone signal, but the present invention is not
limited to this. If the processing capability of the remote control 50 is high, white noise, band noise or TSP (time
stretched pulse: time Stretched pulse) may be used.
[0029]
The present invention is also implemented as a computer-readable recording medium having a program
recorded thereon, for causing a computer to function as a predetermined means in order to cause the computer
to execute the predetermined means, or for causing the computer to realize a predetermined function. You can
also
[0030]
The figure which shows an example of a structure of the acoustic characteristic correction apparatus by one
Embodiment of this invention.
FIG. 7 shows the first half of a flowchart showing the operation of an embodiment of the present invention. FIG.
7 shows the second half of the flowchart showing the operation of an embodiment of the present invention.
Explanation of sign
[0031]
DESCRIPTION OF SYMBOLS 10 main part 12 reception part 16 memory 18 frequency characteristic
calculation part 20 correction characteristic calculation part 22 convolutional operation part 26 measurement
signal generation part 28 reproduction signal generation part 36 ... Speaker, 50 ... Remote control, 52 ...
Microphone, 58 ... Memory, 62 ... Transmission unit, 66 ... Operation unit.
08-05-2019
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