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JPS63209400

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DESCRIPTION JPS63209400
[0001]
[Industrial field of application] The present invention automatically measures the frequency
characteristic of the sound field space for the musical tone emitted from the musical tone
generator and applies signal processing corresponding to the sound field space to the musical
tone signal signal. The present invention relates to an auto equalizer system configured to "Prior
Art" FIG. 5 is a view showing an example of a state where music is being watched. In this
example, a musical tone signal is reproduced from a music source such as a cassette tape using,
for example, a musical tone reproduction device 11 in a car of a car, and the reproduced musical
tone signal is emitted from a sound output unit 12 installed in the rear of the vehicle. It is the
case. Inside the car, a closed, special sound space is created, so that the tones emitted are
reproduced from the music source, with the tone components of a particular frequency being
emphasized or vice versa. The driver hears with an effect different from that of the musical tone.
FIG. 6 is a block diagram showing an example of a tone generation device incorporating a sound
field correction device to compensate for such a defect. As a music source, for example, a musical
tone signal is reproduced from the cassette tape 13 and supplied to the equalizer circuit 14. The
gain is set according to the acoustic characteristics of the sound field space, the supplied tone
signal is corrected and amplified by the set gain, and the corrected tone signal is further
amplified by the power amplifier 15 and the sound generator 12 It is emitted from As described
above, the sound field correction apparatus is configured to control the gain characteristics of
the equalizer circuit 14 according to the characteristics of the sound field when listening to
music, and the equalizer circuit 14 controls the tone signal from the music source. By processing,
it is possible to give the viewer a hearing that the music source 13 is faithfully reproduced
without being influenced by the characteristics of the sound space. Furthermore, it is possible to
make it possible to obtain a listener's favorite hearing by turning around. FIG. 7 is a diagram
showing an example of the configuration of a conventional automatic sound field correction
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apparatus which measures the characteristics of the sound field space and automatically corrects
the tone signal based on the measurement result. A test signal is supplied from the signal a17 to
the tone generator 18 according to a command from the controller 16, and the test signal S
amplified by the tone generator 18 is emitted from the sound generator 12. The test sound is
made to include all signals for measuring the characteristics of the sound space to be perceived.
For example, the test signal S is a sine wave, and as the noise is emitted, the frequency of the sine
wave signal may be swept continuously or intermittently gradually, and it is necessary to
measure the characteristics of the sound field space It may be a pink noise test signal in which all
the signals are mixed simultaneously.
The emitted sound waves are received by a flat microphone 19 of a frequency characteristic
provided at the appreciating position of the viewer and converted into an electric signal. The
electric signal S is supplied to the band pass filter 21 to separate the signal S into signals of a
plurality of frequency bands. In the example of FIG. 7, seven frequency bands F1. For example,
the first band F1 has a center frequency of 65 Hz, the second band F2 has a center frequency of
250 Hz, and the following 500 tlz, I KHz, 1.8 KHz, 4 KHz. And the signal is separated with 10 K
Ilz as the center frequency. The reception signals separated into seven are respectively detected
by the detection rectifier 22 and converted into DC test signals Sl + s2-S. Those direct current test
signals Sl + sfi to S are sequentially supplied to the analog level detector 24 through the analog
multiplexer 23, and signal relays of the direct current test signals SI + 32 to S7 for each of the
bands FL and F2 to F7 are measured, The level is encoded and output. The encoded output is
read into the controller 16. The control device 16 compares the magnitudes of the band-specific
reference signals rl + r2 to r7 known in advance with the magnitudes of the reception signals S1
+ S2 to S7 obtained through the microphone 19 in the sound field space for each band. As a
result of comparison, for example, the test signal S1 in the first band F1 is 1/8 the magnitude of
the reference signal r1 in the band F1, ie -9 db, and the test signal S2 in the second band F2 is
the reference in the band F2 It is calculated by calculation that it becomes 1/2, that is, -3 db иии и и и
in comparison with the signal r2. A display example of the comparison result is shown in FIG.
This characteristic curve represents the sound field characteristics of the sound field space, and
the sound field characteristics do not usually become flat due to the resonance effect in the
vehicle or the like. As described above, even if the music signal is reproduced from the music
source 13 and the sound is emitted as it is, the music viewer can not hear the music signal of the
music source 13 but the automatic sound field correction device Signal processing in which
changes in the frequency characteristics of musical tones are folded in advance are added to the
musical tone signals and emitted, so that the musical tone characteristics reproduced just from
the music source 13 become equal to the musical tone characteristics 13 when reaching the
viewer's ear There is. That is, if it is expressed as shown in FIG. 8, if the tone signal is corrected
so that the characteristic curve becomes flat, the music viewer can be perceived as if the music
source 13 is faithfully reproduced. For this purpose, the correction of the sound field
characteristic and the inverse characteristic shown in FIG. 8 may be added to the musical tone
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signal obtained from the music source 13.
FIG. 9 is a characteristic curve for the correction. The correction signal is supplied from the
sound field correction device 25 to the equalizer circuit 14, and the musical tone signal supplied
from the music source 13 is amplified and output according to the gain set for each band. As a
result, the peculiarities of the sound space are offset, and the viewer can view the music as the
musical tone signal obtained from the music source 13. [Problems to be Solved by the Invention]
In the conventional automatic sound field correction apparatus, to emit a test signal, a signal
sound completely unrelated to a musical tone is emitted for a certain period of time. I have a
hard time. Moreover, it takes a relatively long time, for example, 30 seconds, before the sound
field characteristics are measured and the control of automatic sound field correction is started.
If such an automatic sound field correction device is used as an on-vehicle device, an unpleasant
sound will be heard during driving to interfere with driving, and above all, enjoy immediately
when you want to enjoy music I can not do it. For these reasons, it is a reality that the automatic
sound field correction device is provided in the music generator, but it is rarely used in practice.
[Means for Solving the Problems] In the present invention, a musical tone signal reproduced from
a music source is used as a test signal for measuring the characteristics of the sound field space.
That is, the musical tone signal generated by the musical tone signal generator is emitted as it is,
and the emitted speech is received by the microphone and converted into an electric signal to
make a reception signal. The received signal is separated into a plurality of frequency band test
signals by the first band pass filter detector, and the band-by-band DC test signal components are
supplied to the respective separate input ends of the first analog multiplexer, It is selected and
output from one output end by a selection signal. According to the present invention, the musical
tone signal obtained from the musical tone signal generator is emitted from the sound output
unit and supplied to the second band pass filter detector, and the separated output of the first
band pass filter detector. The signal components of a plurality of corresponding frequency bands
are separated and used as reference signals of the respective bands. The reference signal for
each band output from the second band pass filter detector is supplied to each input end of the
second analog multiplexer, and is sequentially selected and output from one output end by the
band selection signal. These first ones. Each test signal and each reference signal sequentially
output from the second analog multiplexer are supplied to an analog level detector, and the
magnitude of the signal is encoded and output. The encoded signal of the test signal and the
encoded signal of the reference signal output from the analog level detector are compared in
magnitude for the corresponding bands, and the magnitude of the test signal of that band is
calculated with respect to the reference signal of each band. Ru.
In the present invention, the value obtained by performing at least one measurement for each
band is statistically processed to be the characteristic data of the sound field, and the inverted
data controls the size of the musical tone signal for each band. It is considered as a signal. Effect
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of the Invention According to the configuration of the present invention, the tone signal
generated from the music source is emitted without passing through a special signal sound, and
passes through the sound field space to be the received signal, and the tone The signal itself is
taken as the reference signal for the received test signal. Therefore, there is no need for a special
signal source to generate a reference signal, and no unpleasant sound is heard. "Embodiment"
FIG. 1 is a circuit diagram showing an embodiment of the present invention. The tone signal
generator 31 generates a tone signal by reproducing a music source recorded on, for example, a
cassette tape 32 or the like. The musical tone signal reproduced from the cassette tape 32 is
emitted from the speaker 35 via the amplifier 33 (the gain characteristic of the equalizer circuit
34 is kept flat while measuring the characteristic of the sound field space). The emitted tone is
received by the microphone 36 disposed at the position of the viewer and converted into an
electrical signal. The microphone 36 used here is one having a particularly flat frequency
characteristic, which converts the captured musical tone into an electrical signal without special
taste. The electric signal output from the microphone 36, that is, the reception signal S is
amplified by the amplifier 37 and, in this example, is supplied to the first band pass filter
detector 39 via the first analog switch 38. The first band pass filter detector 39 separates the
supplied received signal S into signal components of a plurality of frequency bands F1 and F2 to
F7, and performs a DC test according to the size of each of the separated signal components. It
outputs signals SI + sz to S7. In this example, the received signal S is the first one. Seven
frequency bands F1 to F7 of the second to seventh bands. This is the case where it is divided into
F2 to F7. For example, the first band F1 is a frequency band centered at 60 Hz, the second band
F2 is a frequency band centered at 15011 z, and the third band F3 to the seventh band F7 are
400 Hz respectively. It can be a frequency band centered on I KHz, 2.5 KHz, 6 KHz, 12 KHz. The
test signals SI + s2 to s7 separated and output to the seven bands F1 and F2 to F7 by the first
band pass filter detector 39 are supplied to the input ends 41A and 41B to 41G of the first
analog multiplexer 41, respectively, It is selected and output from its output end 41H in response
to the selection signal fl + f2 to f supplied from the control device 42.
In the present invention, the tone signal of the tone signal generator 31 is emitted from the
sound output unit 35 and used as a reference signal, and is also supplied to the second band pass
filter detector 43. For example, the tone signals of the right and left channels are synthesized into
one signal by the synthesis circuit 44 and, in this example, are supplied to the second band pass
filter detector 43 via the analog switch 45. The second band pass filter detector 43 separates the
supplied musical tone signal into signal components of a plurality of frequency bands, that is, the
same seven frequency bands F1 and F2 to F7 as the first band pass filter detector 39, and
separates them. The direct-current signal corresponding to the magnitude | size of the signal
component classified by band is output as each reference signal rl + r2-r7 classified by band. The
reference signals rl + r2 to r7 of these seven band-by-band signals F1 and F2 to F7 are
respectively supplied to the input ends 46A and 46B to 46G of the second analog multiplexer 46
and are supplied from the control device 42. ~ According to, the output end 46H is selected and
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output. Furthermore, in the present invention, the first. The test signals Sl + 32 to s7 and the
reference signals rl + rz to r7 of the bands Fl and F2 to F7 selected and output from the outputs
41H and 46H of the second analog multiplexer 41. 46 alternately have analog levels The signal
is supplied to the detector 47, and the magnitude of the signal is encoded into a digital value and
output. FIG. 2 is a view showing a configuration example of the analog level detector 47 and a
configuration example of a display 48 for displaying the detection level. The test signals SI + s2
to S output from the first analog multiplexer 41 and the second analog multiplexer 46 and the
reference signals rl + rz to r7 are alternately supplied to the negative input terminal of the
operational amplifier 51. The output of the operational amplifier 51 is fed back to the positive
input terminal and supplied to the negative input terminal of each of a plurality of comparators,
in this example, 14 comparators 52A, 52B to 52N. The comparators 52A, 52B to 52N
respectively receive different comparison signals, and test signals and reference signals
alternately supplied to the negative inputs are compared with the comparison signals. That is,
between the ground line E and the reference voltage 1, the first. The second to fifteenth resistors
53A and 53B to 530 are connected in series, and the connection points 54A and 54B to 54N of
the resistors 53A and 53B to 530 are test signals SI + sz to S, and reference signals rl + r2 to r, r
Are divided into the magnitudes of signals according to the desired level division, and are given
to the comparators 52A and 52B to 52N as comparison signals R1 and R2-R14, respectively.
For example, the first comparison signal R1 applied to the first comparator 52A is at the lowest
comparison level, and the second comparison signal R2 applied to the second comparator 52B is
twice as large as the first comparison signal R1. In other words, 14 levels of comparison signals
R1 and R2-R14, which are larger by 3 db, the third comparison signal R3 is 3 db larger, and 3 db
is sequentially increased by 3 db in the following, are the first one. The signal is supplied to the
positive input end of each of the second to fourteenth comparators 52A, 52B to 52N. The test
signals SI + sz to S and the reference signals rl + rz to r7 are respectively compared with the
comparison signals R1 and R2-R14, and the comparison results are output from the comparators
52A and 52B to 52N. For example, when the test signals SI + sz to S and the reference signals r I
+ r2 to r are smaller than the comparison signals R1 and R2 to R14, the determination signal
?0? is output from each of the comparators 52A and 52B to 52N. If the comparison signals R1
and R2-R14 are larger, 'IJ is output. For example, when the magnitude of the signal supplied to
the analog level detector 47 is between the seventh comparison signal R7 and the eighth
comparison signal R8, the first to seventh comparators 52A, 52B are provided. The .about.52 Gth comparison output is ?1?, and the comparison outputs of the eighth to fourteenth
comparators 52H to 52 N are ?0?. These fourteen comparison / determination outputs are
supplied to the input ends 56A, 56B to 56N of the encoder 56 in this example, respectively, and
the signals S1, 92 to S? Supplied to the analog level detector 47? Encoded data according to the
size of l r + + r t to r 7 is output. The encoder 56 is, for example, a comparator 52A when a
priority encoder is used. According to which input terminals 56A, 56B to 56N are supplied with
the signal "1" from 52B to 52N, 4-bit hexadecimal code 'OJ to' DJ is outputted. In the present
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example, "1" is supplied to the seventh input terminal 56G, and since the signals of the input
terminals 56H to 56N above it are "0", the hexadecimal code "7" is output. Further, 'IJ is supplied
to the tenth input end 56J, and the encoded data in the case where the signal of ~56 N at the
upper input end 56 is ?0? is' AJ. Although the encoded data of the encoder 56 is not shown in
the figure, it is read into the controller 42 through the input / output port PB. In this
embodiment, the detection level of the analog level detector 47 is configured to be displayed by
the display 48. For example, as will be described later, the magnitudes of the received signal S
can be displayed in the bands Fl, F2. It can be displayed as a peak level meter or a spectrum
analyzer displaying in real time separately from F7.
The control device 42 compares the size of the encoded data of the test signal S1 + szl + with
respect to the encoded data of the read reference signals rl + r2 to r7 for each of the bands F1
and F2 to F7. For example, when the encoded data of the reference signal r2 in the second band
F2 is "9" and the encoded data of the test signal s2 is "7J," 7-9--2 to -2X 3db--6db are calculated.
When the encoded data of the reference signal r3 in the third band F3 is' AJ and the encoded
data of the test signal S3 is' 9 ', one 3 db is similarly calculated. That is, the tone signal
component of the third band F3 of the tone signal is calculated to be twice the amount of
attenuation in this sound field space as compared with the tone signal component of the second
band F2. Thus, the mutual comparison of the test signals sI and s2 to s7 with respect to the
reference signals rl + r2 to r7 is performed separately for each of the bands F1 and F2 to F7, and
the calculated characteristic data for the first to seventh bands F1 and F2 to F7 For example, -9
db. -6 db, -3 db, +3 db, -6 db, -9 db, -12 db are obtained. This comparison operation is not limited
to once for each of the bands F1 and F2 to F7, and is repeated a plurality of times over a
predetermined time, and a large number of characteristic data obtained during that time are
calculated for each of the bands F1 and F2 to F2 Statistical processing is performed separately
for each of F7, and maximum likelihood values are calculated respectively. For example, the first
one. When one 9db, -3db, + 3db, Odb, -3db, -6db, -9db are obtained for the second to seventh
bands F1 and F2 to F7, the space characteristic of this sound field is shown in FIG. It can be
expressed as shown. In the present invention, the inverse characteristic 2 of the characteristic
curve thus obtained, for example, the sign of the characteristic data shown above is inverted (!:
+9 db, +3 db, -3 db, Odb, +3 db. The +6 db and +9 db are applied to the equalizer circuit 34
provided in front of the amplifier 33 as correction data. The gain of the equalizer circuit 34 is set
separately for each of the bands F1 and F2 to F7 in accordance with the given correction data
value, and the musical tone signal supplied from the musical tone signal generator 31 is
amplified and output with the set gain. . In this example, the first one. Second... The signal
components of the seventh band F1 and F2 to F7, respectively, +9 db, +3 db, -3 db, and Odb.
Amplify with + 3db, + 5db, + 9db gain and output. As a result, the tone signal emitted from the
sound output unit 35 is, for example, a signal component of the first band Fl as a tone signal
component that is 9 db larger than the case where the music signal is emitted without sound
field correction. As a result, the tone signal component of the second band F2 is greatly emitted
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by +3 db.
The musical tone signal that is actually emitted in this way is processed by the music source and
emitted, but the difference in this characteristic is that the viewer is subjected to attenuation of 9
db or 3 db in the emitted sound field space. The musical tone signal obtained from the music
source 32 is emitted to the ear, and the musical tone can be heard as music as it is. The auto
equalizer system of the present invention applies predetermined correction to the tone
characteristics of the tone signal obtained from the music source 32, and displays the measured
sound field characteristics as a characteristic curve as shown in FIG. can do. In this case, the band
selection signals f, f,... F7 are output from the input / output board PC of the control word W42,
and the band-by-band characteristic display data is input in synchronization with the band The
signal is output from the output port PA and sequentially output to a predetermined display
position of the display 48 in cycle 7 to display the sound field characteristics as shown in FIG.
Next, an operation example of the embodiment shown in FIGS. 1 and 2 will be described. FIG. 3 is
a flow chart for explaining a basic operation example of the automatic sound field correction of
the present invention. (1): Set expected data for starting control of automatic sound field
correction (i = 1>. (2): Entry / output support?output data fj for selecting the band Fi from the
PC. (3) Wait for two predetermined times, for example, 140 ma. (4) Two-person ratio reading:
read the encoded data of the reference signal ri of the selected band Fi from the PB. (5) Wait for
two predetermined times, for example, 100 tns. (6): Read the encoded data of the test signal si of
the selected band Fi from the input / output capo-1-PB. (7): The size of the encoded data of the
read reference signal ri is compared with the size of the encoded data of the test signal si, and
the obtained characteristic data is stored. (8): Advance the band number i. If i ? 8, return to step
(2), and if i ? ? 8, proceed to the next step (9). (9): If the measurement of the sound field
characteristics has not been completed for a predetermined number of times, for example, three
times for each of the bands F1 and F2 to F7, the process returns to step (2) and proceeds to the
next step Ol when completed aO): A plurality of stored characteristic data are statistically
processed for each band to obtain characteristics of the sound field space. 0 ?: Data obtained by
inverting the sign of the determined characteristic data is supplied to the equalizer circuit 34 as
gain control information for each of the bands F1 and F2 to F7 (the equalizer circuit 34
generates a tone with a gain corresponding to the supplied correction data) Start processing the
signal).
(Ljl: The obtained characteristic data is displayed on the display 48 for a predetermined time. The
above processing is the basic control operation of the auto equalizer system of the present
invention, and when the sound field correction is completed, the display of the display 48 is
returned to the original state. For example, the signal level of the test signal SI + 32 to S is real
time Enter the action to display at. FIG. 4 is a waveform diagram for explaining another practical
example of operation of the auto equalizer system of the present invention shown in FIG. In this
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operation example, a large number of data related to the reference signal rl + r2-r directly
banded from the music source 32 and the test signal SI + 32 to S obtained through the
microphone 36 are controlled to be read continuously. In the auto equalizer system of the
present invention, for example, the duty ratio is 50:50 as shown by the waveform A in FIG. 4 and
the operating frequency is IKf (a reference clock of z is supplied from a clock generator (not
shown)). , Operate in synchronization with this reference clock. Also, although not shown in the
figure, when a switch instructing automatic sound field correction control is pressed, as shown in
waveforms B and C, two control signals SAN and MIC are turned to 'HJ, and these signals SAN
and MIC are used. 1st. The second analog switches 38 and 45 are turned on to start the control
operation of automatic sound field correction. The received signal S captured by the microphone
36 and converted into an electrical signal is supplied to the first band pass filter 39, while the
musical tone signal obtained from the music source 32 is supplied to the second band pass filter
43 as the reference signal R. Be done. 1st. Each band Fl of the second band pass filter 39.43,
another output rl + rZ ~ r? + Sl + 32 to s7 are the first one. The second analog waveform indicates
the enable signal supplied to the second analog multiplexer 46, and the output of the second
analog multiplexer 4G is a valid signal only while the enable signal is' LJ. Further, three selection
signal lines are connected to the control unit 42 at the control end 463 of the second analog
multiplexer 46, and a 3-bit digital signal fi is supplied. The waveform E shows how the content of
the selection signal fi changes. The selection signal fi sequentially changes from the first band
signal r0 to the second band signal f2... The seventh band signal f7 at intervals of l ms in
synchronization with the reference clock, following the seventh band signal F7 It is shown that
the first band signal f1 changes sequentially again. The waveform F is a reference signal rl + r! A
signal for sampling ? r, for example, having a pulse width of 1 pa.
The sampling signal {circle over (1)} samples the level of the reference signal component of the
first band F1 specified by the band selection signal r + (waveform E) at that time, and the
sampled signal r1 is supplied to the analog level detector 47. The encoded signal is read into the
control unit 42 in a period of 'LJ' in which the enable signal shown in the waveform is shown.
The sampling signal {circle over (3)} is a sampling signal for reading the reference signal r2 of
the second band F2. Thereafter, the reference signal components 3 to r7 in the seventh band F7
are sequentially read, and reading of the reference signal component is continued again from the
first band F1. The waveform G in FIG. 4 shows the enable signal supplied to the first analog
multiplexer 41. This signal is a waveform of reverse polarity to the enable signal (waveform D) to
the second analog multiplexer 46, and the output of the first analog multiplexer 41 is enabled
when the output of the second analog multiplexer 46 is in the disabled state. Ru. The band
selection signals D +, f,..., F: waveform E) common to the second analog multiplexer 46 are also
supplied to the first analog multiplexer 41. The waveform H is a signal for sampling the test
signals SI + s2 to s7. The sampling signal II samples the level of the test signal s1 in the first band
F1 specified by the band selection signal f + (waveform E) at that time, and the sampled signal s1
is supplied to the analog level detector 47. The encoded signal is read into the control unit 42
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during a period rLJ of the enable signal shown by the waveform G. The sampling signal {circle
over (1)} is a sampling signal for reading the test signal s2 in the second band F2. Thus, in
synchronization with the reference clock (waveform A), the controller 42 continues reading the
coded data of the reference signal of one band and the coded data of the received signal
alternately for one ms during l ms. , 7 ms as one cycle. The data of the second to seventh bands
F1 and F2 to F7 signals r, + S1 + r2 + 32 to rg, and s-f data can be read sequentially. The data of
the read signals rl + sI + r2 + 32 to r7 + s7 are sequentially calculated and stored in a
predetermined storage location of a storage device (not shown). When test signal S or S is not
included in the musical tone signal of the first band F1 or the seventh band F2, for example, the
frequency component 1 of the band formed in the musical tone signal during the period when
the sound field characteristic is measured There is. In such a case, the gain of the band F1 or F7
of the equalizer circuit 34 will be set to infinity.
In order to avoid such a situation, when a significant measurement value can not be obtained, the
gain of that band F1 or F7 of the equalizer circuit 34 is provisionally set to, for example, +3 db.
As described above, the control device 42 can prevent the gain of the equalizer circuit 34 from
being set to an abnormal value by determining the content of the characteristic data at that time.
After this temporary setting, it is preferable to display the notification on the display 48 to notify
the viewer. It can also be configured to repeat the remeasurement automatically or manually. The
display 48 displays the characteristic curve of the sound field space, that is, the magnitude of the
test signal S ++ Sz to S with respect to the reference signal r + + r 2 to r 7 in the bands F1 to F7 in
decibels and a peak level meter As a test signal S. 52 to S, the size of itself can be switched and
displayed. Next, the display operation of the display 48 shown in FIG. 4 will be briefly described.
The display 48 is supplied with display data and band selection signals f + and fz to f to the
decoders 61 and 62, respectively, and displays characteristic data of +12 db to -12 db for each of
the bands Fl and F2 to F7 in nine steps. Can. For example, the characteristic data of the first band
F1 is supplied from the input / output cap PA to the decoder 61 and the decoded output is
output to the display matrix 63. In synchronization with this, the band selection signal f is input
to the input / output port PC, and is supplied to the decoder 62, and its decoded output is output
to the display matrix 63. The size of the characteristic data of the decoded first band F1 is
converted to the height in the first element row 64A at the left end in this figure and displayed.
The characteristic data of the second band F2 is displayed in the second element column 64B
next to the right, and the characteristic data of the seventh band F7 is displayed in the seventh
element column 64G at the right end. These displays are cyclically performed, and it appears to
the human eye that the characteristic data are simultaneously displayed by the seven element
columns 64A to 64G as in the display example shown in FIG. Similarly, correction data as shown
in FIG. 9 can also be displayed. Although the display 48 displays nine levels of +12 db to -12 db,
in the auto equalizer system of the present invention, the level detection output of the analog
level detector 47 has 14 levels of characteristic levels of +12 db to -27 db. One of the features is
that it is configured to be able to measure the 6. compare with the higher level comparison
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signals R6, R7-R14 of the analog level detector 47;
The comparison outputs of the seventh to fourteenth comparators 52F and 52G to 52N can be
supplied to the display matrix 63 via the diodes 65F and 65G to 65N. Therefore, as described
above, the size of the musical tone captured by the microphone 36, that is, the test signals sI + 32
to s7 separated by band can be displayed on the display unit 48 as they are. That is, when the
band selection signals f and r2 to f are sequentially supplied from the input / output port PC to
the first analog multiplexer 41 and the display 48, the first analog multiplexer 41 receives test
signals 31132 for the bands F1 and F2 to F7. The comparison output of ~37 is supplied to the
display 48, and the magnitude of the comparison output is the band F1 in which the comparison
output is to be displayed. The height is displayed in the element row 64 of F2 to F7. In the above
description, it has been described to appreciate the music faithfully restored from the music
source 32 by the auto equalizer system of the present invention. If you want to be able to
manually input desired additional data as additional data when sound field correction is
performed when you want to emphasize and appreciate it, you can appreciate it faithfully to the
music source 32 Not only that, it is also possible to appreciate the music seasoned to the music
source 32. According to experiments that actually confirmed the effect of sound field correction
for this auto equalizer system, the effect of ambient noise is also relatively small compared to the
conventional automatic sound field correction device, and the desired effect can be obtained.
That was confirmed. In the description, the tone signal is divided into seven bands for sound field
correction, but the number of divided bands is not limited to seven. 5 bands or 9 bands or the
like may be used. So far, the description has been made of automatically correcting the sound
field, but the auto equalizer system of the present invention is provided with a manual input
device (not shown), and a desired amount of correction of the tone signal band is desired. It can
also be set manually to the value of. A detailed description of manual sound field correction
functions and means is omitted. "Effects of the Invention" As described above, according to the
present invention, it is not necessary to generate a test sound that gives an unpleasant feeling,
and while enjoying the music reproduced from the music source, the musical tone signal itself of
the music is It can be used to automatically correct the sound field. Further, the time required to
obtain the sound field correction is relatively short, and the time required to obtain the
correction effect as in the prior art is not long.
[0002]
Brief description of the drawings
[0003]
08-05-2019
10
FIG. 1 is a block diagram of an auto equalizer system showing an embodiment of the present
invention, FIG. 2 is a view showing an example of the configuration of an analog level detector
and a display for displaying the magnitude of a signal, and FIG. FIG. 4 is a flow chart for
explaining an operation example of the embodiment, FIG. 4 is a waveform diagram for explaining
the operation of the embodiment, FIG. 5 is a view showing a situation of listening to music in a
car, and FIG. 7 is a block diagram showing an example of the configuration of a conventional
automatic sound field correction apparatus, FIG. 8 is a view showing an example of measured
sound field characteristics, and FIG. 9 These are figures which show the correction data for
correcting the sound field space which has a sound field characteristic shown in FIG.
11: playback device, 12: sound generator, 13: music source, 14: equalizer circuit, 15: power
amplifier, 16: control device, 17: signal source, 18: tone generator, 19: microphone, 21: band
pass Filter, 22: Detection rectifier, 23: Analog multiplexer, 24: Analog level detector, 25: Sound
field correction device, 31: Tone generator, 32: Cassette tape, 33: Amplifier, 34: Equalizer circuit,
35: Sound emission , 36: microphone, 37: amplifier, 38: first analog switch, 39: outer 1 band pass
filter detector, 41: first analog multiplexer, 42X controller, 43: second band pass filter detector,
44: Synthesis circuit 45: second analog switch 46: second analog multiplexer 47: analog level
detector 4 : Display, 51: Operational amplifier, 52: Comparator, 53: Resistor, 54: Connection
point, 56: Encoder, 57:, 58 :, 59 :, 61: Decoder, 62: Decoder, 63: Display matrix, 64: element row,
65: diode, r: reference signal, S: test signal, R: comparison signal.
08-05-2019
11
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