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JP2005101955

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DESCRIPTION JP2005101955
PROBLEM TO BE SOLVED: To adjust acoustic characteristics such as volume between channels
easily and in a short time in an audio apparatus having multi-channel audio channels. SOLUTION:
An acoustic characteristic adjustment device 20 is used for an acoustic device 10 that reproduces
and outputs acoustic signals in multiple channels, and adjusts the acoustic characteristics of each
channel. Test signals having different frequency components are given, and the reproduction
output output from the acoustic device 10 is subjected to frequency analysis to obtain frequency
analysis results, and the acoustic characteristics of each channel are adjusted according to the
frequency analysis results. [Selected figure] Figure 1
Acoustic characteristic adjustment device
[0001]
The present invention relates to an acoustic characteristic adjustment device that corrects
acoustic characteristics such as volume between channels in an acoustic device that performs
acoustic reproduction with multiple channels as in stereo reproduction.
[0002]
In general, in an audio apparatus such as a stereo apparatus, when performing stereo
reproduction of a CD or reproducing a movie sound of a DVD, if there is a difference in volume
between the channels, the listener who listens to the reproduction sound The sound may be
heard to be biased to one side, and furthermore, a phenomenon occurs in which the sound to be
moved from one to the other does not move or the movement stops on the way.
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Therefore, in the acoustic device, when performing acoustic reproduction, it is necessary to
adjust acoustic characteristics such as volume between channels in advance.
[0003]
On the other hand, in order to adjust the acoustic characteristics, a predetermined reference
signal is provided on one recording track, and a large number of combinations for presenting
band-limited noise signals having a certain center frequency at predetermined intervals are
provided. By using a source program having a comparison signal for changing each combination
of center frequencies in the other recording track, the reference signal and the comparison signal
are alternately presented, and each frequency of the equalizer is adjusted so that these signals
have an equal auditory sense volume. There is one in which the level is adjusted (see, for
example, Patent Document 1).
[0004]
Japanese Patent Publication No. 61-36437 (Page 2 column 3 to Page 3 column 5; FIGS. 2 to 5)
[0005]
Since the conventional acoustic characteristic adjustment device is configured as described
above, when attempting to adjust the acoustic characteristics of an acoustic device having multichannel audio channels, it is necessary to adjust the acoustic characteristics for each channel.
There are problems such as adjustment of the characteristics being extremely troublesome and
time-consuming.
[0006]
For example, in the case of movie software, assuming that there are 5.1 sound channels (audio
channels), the reference signal is reproduced from the right front channel, the comparison signal
is reproduced from the left front channel, and the volume etc. It is necessary to reproduce the
comparison signal from the center channel to adjust the acoustic characteristics, and to repeat
the adjustment of the acoustic characteristics for each channel, such as adjusting the acoustic
characteristics in the rear channel, after adjusting the acoustic characteristics of There is a
problem that the adjustment of the acoustic characteristics is extremely troublesome and it takes
time.
[0007]
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2
The present invention has been made to solve the above-described problems, and a first object of
the present invention is an audio device having multiple audio channels, in which acoustic
characteristics such as volume between channels can be easily and quickly achieved. An acoustic
characteristic adjustment device that can be adjusted is obtained.
[0008]
The acoustic characteristic adjustment device according to the present invention is applied to an
acoustic device that reproduces and outputs acoustic signals in multiple channels, and the
acoustic device is provided with a test signal having a different frequency component for each
channel. The frequency analysis means obtains the frequency analysis result by performing
frequency analysis on the reproduction output outputted from the control unit, and the
adjustment control means for adjusting the acoustic characteristic of each channel according to
the frequency analysis result.
[0009]
According to the present invention, a test signal having different frequency components for each
channel is given to the audio device, and the reproduction output output from the audio device is
subjected to frequency analysis to obtain a frequency analysis result, and then the frequency
analysis result is obtained. Since the acoustic characteristics of each channel are adjusted, it is
possible to easily and easily adjust the acoustic characteristics between the channels in a short
time.
[0010]
Hereinafter, an embodiment of the present invention will be described.
Embodiment 1
In FIG. 1, an acoustic characteristic adjustment device 20 is connected to the acoustic device 10.
The acoustic device 10 includes a multi-channel acoustic channel (audio channel) to perform
acoustic reproduction (audio reproduction).
In the illustrated example, the audio device 10 is provided with the DVD player 11 and the 5.1
channel (ch) surround decoder 12, and the reproduced digital audio signal (digital audio signal)
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reproduced by the DVD player 11 is as follows. It is decoded by the 1ch surround decoder 12 to
be a 6ch reproduced digital audio signal.
For example, the reproduction digital audio signal is a left front ch (first channel) audio signal, a
right front ch (second channel) audio signal, a center ch (third channel) audio signal, a right rear
ch (fourth channel) audio signal , Left rear ch (fifth channel) audio signals, and 6 subch digital
audio signals of subwoofer ch (sixth channel) audio signals (hereinafter these digital audio
signals will be referred to as first to sixth digital audio signals) It is assumed.
Then, these reproduced digital audio signals are supplied to the correction circuit unit 13.
[0011]
The correction circuit unit 13 includes equalizer circuits (characteristic compensation circuits)
14a to 14f and variable attenuators (ATTs) 15a to 15f corresponding to the audio channels, and
the equalizer circuits 14a to 14f respectively provide speakers for each audio channel. After
correcting the disturbance of the frequency characteristic due to the influence of the room, the
attenuation is performed by the ATTs 15a to 15f to correct the volume between the audio
channels.
[0012]
Thus, the first to sixth digital audio signals subjected to frequency characteristic correction and
volume correction are respectively subjected to first to sixth analog audio by digital analog (D /
A) converters 16a to 16f. After being converted into signals, the power is amplified by the
amplifiers 17a to 17f, and the speakers 18a to 18f radiate the sound into the room as sound.
[0013]
Although not shown, the correction circuit unit 13 may be provided with a delay circuit for
correcting the delay of the arrival time of the sound due to the difference in the distance from the
speakers 18a to 18f to the listener.
[0014]
The acoustic characteristic adjustment device 20 includes a microphone 21, an analog-to-digital
(A / D) converter 22, a frequency analyzer 23, a control unit 24, and a start switch 25. It has a
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processor (DSP).
Then, when the start switch 25 is turned on, the volume of each audio channel is adjusted using
the test signal as described later.
[0015]
Next, the operation will be described.
Referring to FIG. 2, test signals are recorded on the DVD, which is a recording medium, and in the
illustrated example, they are shown in FIGS. 2 (a) to 2 (f) corresponding to the first to sixth
channels, respectively. The first to sixth test signal components are recorded.
In FIGS. 2A to 2F, amplitude frequency characteristics at the time of discrete Fourier transform of
each test signal component are shown, and the horizontal axis represents frequency, and the
vertical axis represents amplitude.
As illustrated, the first to sixth test signal components are signal components having a plurality
of signal components whose amplitudes are equal to one another and whose frequencies are
different from one another.
[0016]
In the illustrated example, the first test signal component has the (5n + 1) th signal component
(frequency component) S (5n + 1), counting from the lower frequency side (n is 0 or more)
Integer).
The second test signal component also has the (5n + 2) th signal component S (5n + 2), counting
from the lower frequency side, and the third, fourth, and fifth test signal components are The (5n
+ 3) th signal component S (5n + 3), the (5n + 4) th signal component S (5n + 4), and the (5n + 5)
th signal component S (5n + 5) are provided, respectively. . The sixth test signal component is for
a bass subwoofer, and is, for example, white noise band-limited from 20 Hz to 200 Hz.
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[0017]
Then, the signal components of the first to fifth channels are sequentially arranged in an
arrangement such that the signal components S2 to S5 of the second to fifth channels enter
between the signal component S1 of the first channel and the signal component S6. , And the
signal components of the first to fifth channels have frequency bands from 200 Hz to 20 kHz. As
a result, when the frequency bands of the first to sixth channels are combined, the audio band of
20 Hz to 20 kHz is covered. Furthermore, in such a signal, even if the first to sixth channels are
reproduced simultaneously, S (5n + 1) is the signal of the first channel and S (5n + 2) is the first
signal of the second channel. There is a feature that the signals of the 6th channel can be
distinguished.
[0018]
When trying to adjust the acoustic characteristics in each audio channel, the DVD on which the
above-mentioned test signal is recorded is set in the DVD player 11, and reproduction of the test
signal is started. Thus, as described above, the first to sixth test signal components are output as
sounds from the speakers 18a to 18f, respectively. Then, when the start switch 25 is turned on,
the control unit 24 executes the acoustic characteristic adjustment mode.
[0019]
Referring also to FIG. 3, in the acoustic characteristic adjustment mode, control unit 24 controls
correction circuit unit 13 to make the correction amount in correction circuit unit 13 zero from a
preset value. For example, the frequency characteristics of the equalizer circuits 14a to 14f are
made flat, and the attenuation amounts (gain correction amounts) of the ATTs 15a to 15f are
made zero (initial value) (step ST1). When the correction circuit unit 13 includes a delay circuit,
the delay time is zero.
[0020]
The microphone 21 is disposed at a position where the listener should be located, and the sound
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collected by the microphone 21 is given as an acoustoelectric signal to the A / D converter 22,
where it is converted into a digital signal, It is sent to the frequency analyzer 23. The frequency
analyzer 23 analyzes the frequency of the digital signal by discrete Fourier transform, obtains a
signal component (frequency component) Si (i is an integer of 1 or more), and gives the signal
component Si to the control unit 24 (step ST2).
[0021]
The control unit 24 (microprocessor) first sets the channel number m to 1 (step ST3), extracts
the (5n + 1) th signal component from the signal component Si, and obtains the volume in the
first channel (step ST4) .
[0022]
Now, assuming that the volume of the first channel is V1, V1 can be obtained by equation (1).
Here, A (5n + 1) is an amplitude component corresponding to the (5n + 1) th frequency of the
audibility correction (A) filter, Lmax is a number of the upper limit frequency component, and S
(5Lmax + 5) corresponds to 20 kHz Do.
[0023]
As described above, after the volume V1 is obtained, the control unit 24 temporarily stores the
volume V1 in the built-in memory (not shown) and determines whether it is the last channel
number (step ST5). In the illustrated example, since the first to sixth channels are provided, the
control unit 24 sets m = m + 1 (step ST6), returns to step ST4, and the (5n + 2) th signal
component from the signal component Si To calculate the volume V2 of the second channel by
the following equation (2) and store it in the built-in memory.
[0024]
Likewise, the control unit 24 extracts the (5n + 3) -th, the (5n + 4) -th, and the fifth (n + 5) -th
signal components from the signal component Si, and outputs the volume V2 in the third to fifth
channels. ∼V5 is obtained by the following equations (3) to (5) and stored in the built-in
memory.
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[0025]
On the other hand, the control unit 24 obtains the volume V6 in the sixth channel by the
following equation (6), and stores the volume V6 in the built-in memory.
Here, L200 is a number of a signal component corresponding to 200 Hz.
[0026]
As described above, when the volume V1 to V6 is obtained, the control unit 24 determines that
the channel number is the last channel number in step ST5, reads the volume V1 to V6 from the
built-in memory, and determines the first to sixth channels. The volume differences of the ATTs
15a to 15f are adjusted according to the result, and the attenuation amounts of the ATTs 15a to
15f are adjusted (step ST7). For example, the control unit 24 compares the volume V1 with the
volumes V2 to V6 by using the first channel as a reference channel (with the volume V1 as a
reference volume), obtains deviations respectively, and ATTs 15a to 15f according to the
deviations. Will adjust the amount of attenuation. After adjusting the attenuation amount in this
manner, the control unit 24 returns the equalizers 14a to 14f to the original setting values.
[0027]
In this manner, when the attenuations of the ATTs 15a to 15f are adjusted, the volumes of the
first to sixth channels become equal, and the listener can enjoy a sound with a balanced volume
and a sense of movement. As is apparent from the above description, the microphone 21, the A /
D converter 22, and the frequency analyzer 23 function as frequency analysis means, and the
control unit 24 functions as adjustment control means.
[0028]
As described above, according to the first embodiment, a test signal having a different frequency
component for each channel is used to simultaneously output sound corresponding to the test
signal from the acoustic device, and frequency analysis is performed on the sound. Since the
volume of each channel is adjusted according to the signal component (frequency component)
selected, acoustic characteristics such as the volume between channels can be easily and quickly
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achieved even in an audio apparatus having multi-channel audio channels. Can be adjusted.
[0029]
Second Embodiment
In FIG. 4, the same elements as those of the acoustic characteristic adjustment apparatus shown
in FIG. 1 are denoted by the same reference numerals. In the acoustic characteristic adjustment
device 30 shown in FIG. 4, the control unit 24 includes a microprocessor (CPU) 24a, a memory
24b, and an input / output interface 24c. The CPU 24a, the memory 24b, and the input / output
interface 24c are connected to a data bus DB. And the address bus AB. The first to sixth test
signal components described with reference to FIG. 2 are stored in the first memory area of the
memory 24b.
[0030]
The frequency analyzer 23 is connected to the CPU 24a via the input / output interface 24c, and
the illustrated acoustic characteristic adjustment device 30 further includes a switching circuit
31. The switching circuit 31 is disposed between the 5.1ch surround decoder 12 and the
correction circuit unit 13 and selectively connects the control unit 24 or 5.1ch surround decoder
12 with the correction circuit unit 13.
[0031]
Next, the operation will be described. In the normal state, the switching circuit 31 connects the
5.1ch surround decoder 12 and the correction circuit unit 13, and as described in FIG. 1, when
the start switch 25 is turned on, the CPU 24a sets the acoustic characteristic adjustment mode.
The switching control signal is sent to the switching circuit 31 via the input / output interface
24c. Thereby, the switching circuit 31 connects the control unit 24 and the correction circuit unit
13.
[0032]
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Thereafter, the CPU 24a performs the process described in step ST1 of FIG. 3 and then accesses
the memory 24a to read out the first to sixth test signal components, and via the input / output
interface 24c and the switching circuit 31. It sends to the correction circuit unit 13. As a result,
sounds corresponding to the first to sixth test signal components are output from the speakers
18a to 18f.
[0033]
Then, the CPU 24a executes steps ST2 to ST7 of FIG. 3 to adjust the attenuation amount of each
ATT (not shown in FIG. 4) of the correction circuit unit 13 to adjust the acoustic characteristic. In
the example shown in FIG. 4, the sound volumes V1 to V6 are temporarily stored in the second
memory storage area of the memory 24b.
[0034]
As described above, according to the second embodiment, when the test signal is stored in the
memory in advance and the acoustic characteristic adjustment mode is set, the test signal is read
from the memory and the sound corresponding to the test signal is output. Since the volume of
each channel is adjusted in accordance with the signal component obtained by frequency
analysis, it is possible to use an audio device having multi-channel audio channels without
requiring a recording medium such as a DVD. Also, the effect of being able to adjust the acoustic
characteristics such as the volume between channels easily and in a short time can be obtained.
[0035]
Third Embodiment
In FIG. 5, the same elements as those of the acoustic characteristic adjustment apparatus shown
in FIG. The acoustic characteristic adjustment device 40 shown in FIG. 5 includes a signal
processing unit 41. The signal processing unit 41 includes a microprocessor (CPU) 41a, a
memory 41b, and an input / output unit (I / O) 41c. The I / O 41 c is connected to the 5.1 ch
surround decoder 12. Then, the signal processing unit 41 generates a test signal as described
later according to the control signal from the control unit 24 and performs frequency analysis of
the digital signal received from the A / D converter 22.
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[0036]
Next, the operation will be described. As described with reference to FIG. 1, when the start switch
25 is turned on, the control unit 24 executes the acoustic characteristic adjustment mode to
provide the signal processing unit 41 with a control signal. The signal processing unit 41 starts
the processing operation by the control signal. Furthermore, the control unit 24 performs the
process described in step ST1 of FIG.
[0037]
Referring also to FIG. 6, in signal processing unit 41, CPU 41a sets an initial value of the address
of memory 41b with channel number m = 1 (step ST8). Then, the CPU 41a receives the digital
audio signal (audio waveform data) of the first channel from the 5.1ch surround decoder 12 for
the movie audio reproduced by the DVD player 11 through the I / O 41c, and the first of the
memory 41b (Step ST9). Then, the address is incremented (step ST10), and the CPU 41a
determines whether or not it is the last speech waveform data (step ST11). If it is not the last
speech waveform data, m = m + 1 is set (step ST12) Then, step ST9 is performed again, and the
audio waveform data of the second to fifth channels are received and stored in the first memory
area of the memory 41b.
[0038]
Thus, after storing the voice waveform data of the first to fifth channels in the first memory area
of the memory 41b, when determining that it is the last voice waveform data, the CPU 41a sets m
= 1 (step ST13). The voice waveform data of the first channel is read out from the first memory
area of the memory 41b, and FFT (Fast Fourier Transform) processing is performed (step ST14).
In the CPU 41a, signal components (frequency components) obtained as a result of FFT
processing are signal components other than signal components S (5 n + h) (h is an integer from
1 to 5 and corresponds to a channel, n = 0 to L max) After deletion, inverse FFT processing is
performed, and the inverse FFT processed data is stored in the second memory area of the
memory 41b (step ST15).
[0039]
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Thereafter, the CPU 41a determines whether or not it is the last speech waveform data (step
ST16). If it is not the last speech waveform data, m = m + 1 is set (step ST17), and steps ST14 and
ST15 are executed again. . Thus, after performing the FFT process on the voice waveform data of
the first to fifth channels, the signal components other than the signal component S (5n + h) are
removed, the inverse FFT process is performed, and the inverse FFT process is performed. Data
will be stored in the second memory area of the memory 41b.
[0040]
Then, the CPU 41a generates the first to fifth test signal components S (5n + 1) to S (5n + 5)
based on the inverse FFT processed data stored in the second memory area of the memory 41b. ,
And stored in the third memory area of the memory 41b. At this time, the CPU 41a generates
white noise data as the sixth test signal component described in FIG. 1 and stores the white noise
data in the third memory area of the memory 41b.
[0041]
Referring to FIG. 7, the CPU 41a accesses the third memory area of the memory 41b to read out
the first to sixth test signal components and sends them to the correction circuit unit 13 (step
ST18). As a result, sounds corresponding to the first to sixth test signal components are output
from the speakers 18a to 18f.
[0042]
Then, the CPU 24a receives the digital signal received from the A / D converter 22 as a reception
digital signal, and temporarily stores it in the fourth memory area of the memory 41b (step
ST19). Thereafter, the CPU 41a performs FFT processing on the received digital signal to obtain a
signal component (frequency component) Si, and applies the signal component Si to the control
unit 24 (step ST20).
[0043]
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The control unit 24 first extracts the (5n + 1) -th signal component from the signal component Si
with channel number m = 1, and obtains the volume V1 in the first channel (step ST21). Likewise,
the sound volumes V2 to V6 in the second to sixth channels are determined, and it is determined
whether or not they are the last channel numbers (step ST22). The volume differences of the six
channels are calculated, and the attenuation amounts of the ATTs 15a to 15f are adjusted
according to the result (step ST23). For example, with the volume V1 as the reference volume,
the control unit 24 compares the volume V1 with the volume V2 to V6 to obtain a deviation, and
adjusts the attenuation of the ATTs 15a to 15f according to the deviation. .
[0044]
In the example shown in FIG. 5, the path connecting the 5.1ch surround decoder 12 to the
correction circuit unit 13 is omitted, and for example, the signal processing unit 41 or 5 using
the switching circuit 31 described in FIG. The 1ch surround decoder 12 is selectively connected
to the correction circuit unit 13. Further, in FIG. 5, the microphone 21, the A / D converter 22,
and the signal processing unit 41 function as frequency analysis means, and the signal
processing unit generates a test signal in accordance with the acoustic signal. It also functions as
a means. In the first, second, and third embodiments, an example is described in which the values
of the equalizer circuit of the correction circuit and the delay circuit are returned to zero (initial
value) and adjustment is started. The volume adjustment may be started without initializing. In
this case, even after the listener adjusts the bass and treble according to the characteristics of the
room or his or her preference, the volume can be similarly adjusted.
[0045]
As described above, according to the third embodiment, a test signal is generated based on an
audio signal reproduced by a DVD player, an audio corresponding to the test signal is output, and
this audio is frequency analyzed. Since the volume of each channel is adjusted according to the
obtained signal component, even in an acoustic apparatus having multi-channel audio channels,
it is possible to adjust acoustic characteristics such as volume between channels easily in a short
time. The effect of being able to
[0046]
Fourth Embodiment
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In FIG. 8, the same elements as in FIG. 4 are denoted by the same reference numerals. In the
acoustic characteristic adjustment device 42 shown in FIG. 8, the control unit 43 includes a
microprocessor (CPU) 43a, a waveform memory 43b, a reception memory 43c, a characteristic
memory 43d and a start switch 44, and the CPU 43a and each memory 43b, 43c, The data bus
43 d and the input / output interface 43 e are mutually connected by a data bus DB and an
address bus AB. The waveform memory 43b stores the first to sixth test signal components
described with reference to FIG. The reception memory 43c stores signal components (frequency
components) collected by the microphone 21 and subjected to frequency analysis, and the
characteristic memory 43d stores the signal components (frequency components) of the
channels 1 to 6.
[0047]
The following operation will be described. FIG. 9 is a flowchart of the acoustic characteristic
adjustment mode. When the start switch 44 is turned on, the CPU 43a starts the acoustic
characteristic adjustment mode of FIG. The initial value of the output channel is set to which
channel the waveform memory 43b is to be output first, and the repetition number R is set to 1
(step ST24). Test signals 1 to 6 stored in the waveform memory 43b are sent out (step ST25).
The sound is collected by the microphone 21, converted into a digital signal by the A / D
converter 22, subjected to discrete Fourier transform by the frequency analyzer 23, and the
analyzed frequency component Si is stored in the reception memory 43c (step ST26). The CPU
43a of the control unit 43 first stores the signal component S (5n + 1) of channel number 1 in
the first memory area of the characteristic memory 43d. The signal component S (5n + 2) of
channel number 2 is stored in the second memory area of the characteristic memory 43d.
Similarly, for the signal components S (5n + 3), S (5n + 4) and S (5n + 5) of channel numbers 3 to
5, the component of channel number 6 is the sixth in the third, fourth and fifth memory areas.
(Step ST27).
[0048]
Next, the channel number for outputting the test signal 1 is switched to 2, and the channel
number for outputting the test signal 2 is switched to 3. Likewise, test signal 3 is switched to
channel number 4, test signal 4 to channel number 5, and test signal 5 to channel number 1
(step ST28). Since the channel number 6 exclusively handles the low frequency band, the test
signal 6 is output and there is no need to change it. The repeat number is advanced by one and
test signals of the first to sixth channels are transmitted (step ST25). After the signal component
Si analyzed at this time is temporarily stored in the reception memory 43c (step ST26), the signal
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component of each channel number is stored in the first to fifth memory areas of the
characteristic memory 43d. That is, the signal component S (5n + 5) of channel number 1 is in
the first memory area of the characteristic memory 43d, the signal component S (5n + 1) of
channel number 2 is in the second memory area, and the signal of channel number 3 is
Component S (5n + 2) is in the third memory area, channel number 4 is the signal component S
(5n + 3) in the fourth memory area, and channel number 5 is the fifth signal component S (5n +
4). Are stored in the memory area S (5n + 4) of the above (step ST27). Since the test signal of
channel number 6 has no switching and is the same as before, there is no need to store it again.
[0049]
The above operation is repeated until the signal component Si of channel number 1 stores S (5n
+ 2) (step ST29). Repeatingly, in the first memory area of the characteristic memory 43d, the
signals of S (5 n + 1), S (5 n + 5), S (5 n + 4), S (5 n + 3), S (5 n + 2) The components will be
stored. Therefore, the signal component Si of channel number 1 is stored after frequency analysis
of all signal components (frequency components) from 200 Hz to 20 kHz. Similarly, for channel
numbers 2 to 5, all frequency components up to 20 kHz are stored. Next, from the signal
components stored in the characteristic memory 43d, the volume of the first to sixth channels is
calculated, and the volume is adjusted.
[0050]
As described above, according to the fourth embodiment, all frequency components of each
channel can be obtained by sequentially switching and outputting the channel numbers for
outputting a plurality of test signals and performing frequency analysis. Since the volume can be
adjusted using all the frequency components, it is possible to obtain the effect that the volume
adjustment can be performed with higher accuracy.
[0051]
BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram which shows the acoustic
characteristic adjustment apparatus by Embodiment 1 of this invention with an acoustic
apparatus.
It is a figure which shows the state which carried out the discrete Fourier transform of the test
signal used with the acoustic characteristic adjustment apparatus shown in FIG. 1, and (a)-(f) is a
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figure which shows the test signal component corresponding to the 1st-6th channel, respectively.
is there. It is a flowchart for demonstrating the operation | movement of the acoustic
characteristic adjustment apparatus shown in FIG. It is a block diagram which shows the acoustic
characteristic adjustment apparatus by Embodiment 2 of this invention with an acoustic
apparatus. It is a block diagram which shows the acoustic characteristic adjustment apparatus by
Embodiment 3 of this invention with an acoustic apparatus. It is a flowchart for demonstrating
the operation | movement of the signal processing part shown in FIG. It is a flowchart for
demonstrating the operation | movement of the acoustic characteristic adjustment apparatus
shown in FIG. It is a block diagram which shows the acoustic characteristic adjustment apparatus
by Embodiment 4 of this invention with an acoustic apparatus. It is a flowchart for demonstrating
the operation | movement of acoustic characteristic adjustment shown in FIG.
Explanation of sign
[0052]
DESCRIPTION OF SYMBOLS 10 sound apparatus, 11 DVD player, 12 5.1 channel (ch) surround
decoder, 13 correction circuit part, 14a, 14b, 14c, 14d, 14e, 14f Equalizer circuit (characteristic
compensation circuit), 15a, 15b, 15c, 15d , 15e, 15f variable attenuator (ATT), 16a, 16b, 16c,
16d, 16e, 16f digital analog (D / A) converter, 17a, 17b, 17c, 17d, 17e, 17f amplifier (amplifier),
18a, 18b, 18c, 18d, 18e, 18f speakers, 20, 30, 40, 42 acoustic characteristic adjustment devices,
21 microphones, 22 analog digital (A / D) converters, 23 frequency analyzers, 24, 43 control
units, 24a, 41a, 43a microprocessor (CPU), 24b, 41b, 43b, 43c 43d memory, 24c, 43e output
interface, 25,44 start switch, 31 switch circuit, 41 a signal processor, 41c output unit (I / O).
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