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JPS61184999

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DESCRIPTION JPS61184999
[0001]
The present invention relates to a method of automatically determining equalizer characteristics,
and more particularly to a method of automatically determining equalizer characteristics that
makes listening characteristics substantially flat over the entire region based on acoustic
characteristics of a sound field. <Prior Art> There is an AF device that determines the acoustic
characteristics of a sound field and makes the listening characteristics substantially flat over the
entire region based on the determined acoustic characteristics. On the heels, the audio device
comprises: (1) means for requesting automatic determination of the equalizer characteristics; and
(21, lt-means for generating a test signal having a constant level throughout the frequency range
of the signal. (3) Equalizers specified by gains or attenuation amounts in several bands, Equalizer
unit for controlling frequency characteristics of audio signal input based on one dither
characteristic, and (4) for each of the bands in the sound field A detection unit for detecting a
level; and (5) a control unit for determining an equalizer characteristic for making the listening
characteristic in the sound field substantially flat over the entire area based on the detected level;
And detects the level of each band of the test signal output to the sound field by the equalizer
characteristic automatic determination request, and detects the level of each detected band. To
determine the equalizer characteristics to flatten the listening characteristic of the sound field in
Zui is possible to set the equalizer. That is, conventionally, a test signal whose level is constant
over the entire audio frequency is output to the sound field through the line amplifier, the power
amplifier and the speaker according to the equalizer characteristic automatic determination
request. Then, if the level of each band of the test signal output to the sound field is detected, and
the acoustic characteristic obtained using the detected level is, for example, as shown in FIG. As
shown in FIG. 6B, the equalizer characteristic is determined so that the listening characteristic is
flat <c, and this is set in the equalizer section. In FIG. 3, the horizontal axis is frequency, and the
vertical axis is gain (d B). <Problems to be Solved by the Invention> However, even if the
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equalizer characteristics are determined by such a conventional method, the listening
characteristics do not become flat but become uneven as shown in FIG. 3 (D). This is because the
test signal is not output to the sound field through the equalizer section, and t! This is because
one equalizer characteristic determination process is performed to determine a final equalizer
characteristic. It should be noted that the reason why the equalizer section is not used is that the
adjustment section of the frequency level by the simulated inductor that constitutes the equalizer
section has a certain width around each of the center frequencies f and f as shown in FIG.
Because they overlap.
That is, even if only the frequency levels of f and f are changed as shown by the solid line and the
frequency level of f2 is not changed, the overall frequency level is as shown by the dotted line
and the frequency level of f2 is also substantially changed. It is because From the above, it is an
object of the present invention to provide an automatic equalizer characteristic determination
method that can accurately flatten the listening characteristic over the entire region according to
the acoustic characteristic of the sound field. In the equalizer characteristic automatic
determination method of the present invention, (1) means for generating a test signal having a
substantially constant level over the entire frequency range of the audio signal is provided in
front of the equalizer unit; A first step of setting a predetermined equalizer characteristic in the
equalizer unit according to an equalizer characteristic automatic determination request and
inputting the test signal to the equalizer unit, and (2) each of the test signals output to the sound
field through the equalizer unit A second step of detecting the level of the band; (3) a third step
of determining equalizer characteristic correction data for flattening the listening characteristic
based on the detected level of each band; and (4) the equalizer characteristic correction data A
new equalizer characteristic is obtained using the equalizer and the equalizer characteristic data
set in the equalizer unit, and A fourth step of constant, and comprising the step of determining
the equalizer characteristic to be set to the final equalizer repeated predetermined times to the
subsequent processing (5) the second step. Effect) means for requesting automatic determination
of equalizer characteristics, means for generating a test signal having a substantially constant
level over the entire audio signal frequency, and equalizer characteristics specified by gain or
attenuation in several bands Equalizer for controlling the frequency characteristics of the input
audio signal, a detector for detecting the level of each band in the sound field, and equalizer for
making the listening characteristic substantially flat over the entire area based on the detected
level A control unit for determining the characteristics is provided, and the test signal generation
means is provided on the front stage of the equalizer unit to constitute an equalizer characteristic
automatic determination apparatus. Then, in accordance with the equalizer characteristic
automatic determination request, for example, the equalizer characteristic having a gain or
attenuation amount of 0 dB in each band is set in the equalizer unit, and the test signal is input to
the equalizer unit. After that, the level of each band of the test signal output to the sound field
through the equalizer section is detected, and an equalizer characteristic that flattens the
listening characteristic is determined based on the level of each detected band. Set the
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characteristics in the equalizer section.
Then, equalizer characteristic correction data for detecting the level of each band of the test
signal output to the sound field based on the Icora and Isa characteristics and flattening the
listening characteristic of the sound field based on the detected level of each band Ask for
Finally, the equalizer characteristic set in the equalizer unit and the gain or attenuation amount
of the corresponding band of the equalizer characteristic correction data are added to finally
determine the equalizer characteristic to be set in the equalizer unit. FIG. 1 is a block diagram of
an equalizer characteristic automatic determination apparatus for realizing the equalizer
characteristic automatic determination method according to the present invention. In the figure,
reference numeral 11 denotes an equalizer unit for controlling the frequency characteristics of
the audio signal input from the input terminal IN based on predetermined equalizer
characteristic data, and reference numeral 12 denotes an operation unit. Equalizer key), a key
requesting frequency control based on preset equalizer characteristic data, a key requesting
display of the frequency level of output signal (spectrum analyzer display), and setting gain or
attenuation of each band It has various keys, such as an up key and a grand key, provided for
each band. Reference numeral 13 denotes a control unit having a microcomputer configuration,
which is not shown but has a processor, a RAM, a ROM, a one-person output board, etc. 17 and is
configured according to a request from the operation unit 12 based on a control program stored
in the ROM. Processing, for example (1) Equalizer characteristic automatic determination
processing, (2) Frequency characteristic am by preset equalizer characteristic, (3) Control based
on equalizer characteristic set by up key or down key, (4) Spectrum analyzer display Execute
control etc. A pink noise generator 14 is provided at the front stage of the equalizer unit 11, and
generates pink noise (hereinafter referred to as a test signal) of a constant level over the entire
frequency band of the audio signal in the equalizer characteristic automatic determination
process. Reference numeral 15 denotes a level detection unit for detecting the level of each band.
(1) At the time of equalizer characteristic automatic determination processing, the level in each
band of the test signal output to the sound field (for example, in a car) is detected and input to
the control unit 13 (2) When displaying a spectrum analyzer, the level in each band of the audio
signal output from the equalizer unit 11 is detected and input to the control unit 13. Reference
numeral 16 denotes a display unit for selectively displaying a bar graph display of equalizer
characteristics set in the spectrum analyzer display or the equalizer unit 11; LED elements (not
shown) arranged in a matrix, and digit drivers for driving the LED elements , Segment drivers and
the like.
Reference numerals 17 to 18 denote muting circuits, and 19 denotes a mixing circuit, which
appropriately inputs an audio signal and a test signal to the equalizer unit 11. ????????
????? The equalizer unit 11 includes a bridge amplifier lla, a latch circuit 11b in which the
equalizer characteristic (gain or attenuation of each band) is digitally set by the control unit 13,
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and n number of simulated inductors provided corresponding to each band. It is configured to
have the sections 11 c-1 to 1 and 1 c-n, and n analog switches 1.1 ci to 1.1 d and-n provided
corresponding to the respective bands. Analog switches 1id-i (i-1, 2,... N) provided corresponding
to each band perform switching operation based on gain and in (or attenuation amount) of each
band set in the latch circuit 11b. Then, the inductance value of the corresponding simulated
inductance part 11 cmn (i = 1.2 ии n) is set to a predetermined value. ???????? The audio
signal from 19 is input to the ten terminals of the bridge amplifier lla, and n simulated inductor
parts set to predetermined values by the analog switches 11 d-i (i = 1, 2... N) 1] It is inputted to
one terminal of the bridge amplifier lla via ci (i = 1. 2... N). As described above, the gain or
attenuation of each band is controlled in accordance with the equalizer characteristics set in the
latch circuit 11b, and the input audio signal is output to the sound field through the line
amplifier 20, a power amplifier not shown, a speaker, etc. Ru. That is, graphic equalizer control
(GEQ) can be performed by setting equalizer characteristic data in the latch circuit. For example,
(1) In normal equalizer characteristic control, equalizer control is performed by setting gain
(attenuation amount) data of each band set by the operation of the up key and down key
provided for each band in the latch circuit 11 b. (2) The control (PGEQ) based on the equalizer
characteristic stored in advance in the memory can be performed by setting the preset desired
equalizer characteristic data in the latch circuit @ 11b. The level detection unit 15 includes a
microphone 15a for collecting an acoustic signal (test signal) level in a sound field at the time of
automatic determination of equalizer characteristics, a head amplifier 15b for amplifying a
microphone output, and a band provided for each band of n channels. Based on the pass filters
15c-1 to 15c-n and the selection command from the control unit 13, the level of the first channel,
the level of the second channel, "... the level of the nth channel" b are sequentially periodic. And
an AD converter 15e for converting an analog signal output from the analog switch 15d into a
digital value.
Now, in the spectrum analyzer display mode [in this case, the audio signal output from the
equalizer unit 11 is input to the band pass filter 15 cm 1 (i = 1. 2. Further, in the spectrum
analyzer display mode, a selection command is input to the analog switch 15 d of the control unit
13. As a result, the band pass filter output of each channel is periodically input to the AD
conversion circuit 15 e. And control part 13 AD conversion il! The level (digital value) of each
band AD converted by 15e is read, and the segment driver and digit driver (not shown) of the
display unit 16 are driven based on the read level to turn on the LED elements, Pergraph the
level (spectrum). On the other hand, in the equalizer characteristic automatic determination mode
that automatically determines the equalizer characteristic for flattening the listening
characteristic based on the acoustic characteristic of the sound field, the muting circuit 17.18
turns on and the pink noise generator 14 tests. A signal is output, and the test signal is input to
the equalizer unit 11 through the mixing circuit 19. As a result, band pass filters 15c 1 (i = 1, 2.
The test signal collected by the microphone 15a is inputted to the) through the head amplifier
15b, and the level of each band is similarly read by the control unit 13. Next, equalizer
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characteristic automatic determination processing according to the present invention will be
described. (1) The auto equalizer key on the operation unit 12 is used to automatically determine
the equalizer characteristic for flattening the listening characteristic in the cabin of a car where a
sound field, for example, an audio device is installed and becomes a listening room. (Not shown).
Thereby, an equalizer characteristic automatic determination request signal is generated. (2) The
control unit 13 detects the suppression of the auto equalizer key, and sets equalizer
characteristic data in which the gain of each band is 0 dB to the latch frequency g811b of the
equalizer unit 11 (see FIG. 2A). In FIG. 2, the horizontal axis is frequency, and the vertical axis is
gain (dB). (3) Also, due to the suppression of the auto equalizer switch, the control unit 13 inputs
the muting enable signal MTES to the muting circuit 17.18 to turn on each muting circuit and
enable the pink noise generator 14 The signal TGS is input, and the pink noise generator
generates a test signal whose level is constant over the entire frequency band of the audio signal.
As a result, the input of the audio signal to the equalizer unit 1] and the output of the equalizer
unit (the input to the band pass filter 15C-i of the signal i are blocked, and instead the test signal
from the pink noise generator 14 is the equalizer unit 11, and the microphone output is input to
the bandpass filter 15 cm1. (4) The test signal that has passed through the equalizer unit 11 is
output from the output terminal OUT through the line amplifier 20 and thereafter supplied to the
power amplification type of the audio device (not shown) to drive the speaker and output as a
voice in the listening room Be done. (5) The test signal output to the listening room (sound field)
is detected by the microphone 15a and becomes an electrical signal, and each band pass filter
15c-i (i = 1, 2, 3) via the head amplifier 15b.? ?) Is supplied. (6) In the equalizer characteristic
automatic determination mode, the control unit 13 first causes the level of the frequency signal
output from the band pass filter corresponding to the reference channel, for example, the
channel of 800 Hz, through the analog switch 15 d and the AD conversion '1415 e. The signal is
read at predetermined intervals, and it is checked whether the signal level has reached the set
level (whether the 0 dB level has been reached). In other words, the control unit 13 first checks
whether the best tuning has been made. (7) If the best tuning is performed, the control unit
inputs a selection command to the analog switch 15d, and the analog switch 15cl cyclically
outputs the band pass filter output of each channel to the AD converter 15e at a predetermined
cycle according to the selection command. input. (8) The AD converter 15 e sequentially AD
converts each input analog band level, and the control unit 13 takes in the AD converted digital
value. (9) Equalizer characteristic correction such that the listening characteristic becomes flat
over the entire frequency band of the audio signal if the control unit 13 reads the level (see FIG.
2 CB) of the entire band of the test signal input from the microphone 15a Determine the data
(see FIG. 2 (C)). That is, the control unit 13 compares the output level of each band pass filter 15
c ?i (i = 1, 2,... N) with the setting level, converts the difference into logarithm, and corrects the
equalizer characteristic for each band Ask for data. For example, for channels with signal levels
higher than the setting level, attenuation amounts according to the difference are obtained, for
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channels with low signal levels, gains according to the difference are obtained, and equalizer
characteristic correction data consisting of these data is obtained.
(1 [O Then, the control unit 13 determines the equalizer characteristic data set in the latch circuit
11b of the equalizer unit 11 (all 0 dB in the initial stage and stored in the built-in RAM) and
determined in step (9) Equalizer characteristic correction data is added for each band (channel)
to obtain an equalizer characteristic (see FIG. 2 (D)) to be newly set in the latch circuit 11b and
stored in the built-in RAM and set in the latch circuit The equalizer characteristic initially set to
the latch frequency g811b is 0 dB over the entire band (all channels), so the first-time equalizer
characteristic correction data obtained above becomes the equalizer characteristic data set as it is
in the latch circuit 11b. ing. (11) Thereafter, the processing of steps (6) to (9) is repeated, and the
level in the entire band of the test signal inputted from the microphone 15a at the time of the
equalizer characteristic shown in FIG. 2 (D) (see FIG. 2 (E) After that, equalizer characteristic
correction data (see FIG. 2 (F)) is calculated for the second time for each channel to flatten the
after-hearing characteristic. (Ia Next, the control unit 13 adds the equalizer characteristic data set
in the latch circuit 11b and the second calculated equalizer characteristic correction data for
each channel and finally sets the latch circuit 11b of the equalizer 11 The equalizer
characteristics (see FIG. 2 (G)) to be calculated are calculated and set in the latch circuit 11b.
(131t, after that, the control unit 13 turns off the muting circuit 17. 18. At the same time, the test
signal generation of the pink noise signal generator 15 is stopped to restore the audio signal.
From the above, the listening characteristic becomes substantially flat over the entire band as
shown in FIG. 2 (H). If the flat listening characteristic can not be obtained even by the above
processing, the processing after step (6) is repeated until it becomes flat. Although the equalizer
characteristic in which the gain of each band at the initial stage is 0 dB is set to the equalizer unit
11 in the above, the present invention does not necessarily initialize the equalizer characteristic
of all 0 dB. <Effects of the Invention> As described above, a means for generating a test signal
having a substantially constant level over the entire frequency range of the audio signal is
provided in the previous stage of the equalizer unit, and predetermined equalizer characteristics
are equalized by the equalizer characteristics automatic determination request. A first step of
setting the test signal to the equalizer unit, and a second step of detecting the level of each band
of the test signal output to the sound field through the equalizer unit; each detected band Third
step of determining equalizer characteristic correction data to flatten the listening characteristic
based on the level of d. Equalizer characteristic to be newly set in the equalizer unit using the
equalizer characteristic correction data and the equalizer characteristic data set in the equalizer
unit Step 4 and step 2 for determining and setting Finally, the fifth step of determining the
equalizer characteristics to be set in the equalizer unit is configured to determine the final
equalizer characteristics, so that flat listening characteristics can be assured over the entire band
according to the acoustic characteristics of the sound field. I was able to get it.
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[0002]
Brief description of the drawings
[0003]
1 is a block diagram of an apparatus for realizing the present invention, FIG. 2 is a characteristic
explanatory view for explaining the method of the present invention, FIG. 3 is an explanatory
view for the conventional characteristic, and FIG. is there.
11 и и и equalizer unit, 11a и и и bridge amplifier, llb и и и и и и и и и и и и и и и и и и control unit, 14 и и и pink
noise generator, 15 и и level detection unit, 15a и и и microphone 15 c ? i (i = 1, 2,...)... Band pass
filter 1.15 d .. Analog switch, 16. .. display unit patent applicant Alpine, Inc. Attorney Attorney
Saito Chika Figure 2 (A) (B) (C) (E) (F) (G) Fig. 3 (A) (B) Fig. 4 (H)
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