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JPH06311587

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DESCRIPTION JPH06311587
[0002]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
method of setting a network gain in an audio apparatus for performing acoustic correction on an
audio signal carrying music information obtained from a predetermined sound source.
[0004]
[0002] A parametric equalizer (hereinafter referred to as "P-EQ") for an audio signal obtained
from a recording medium such as a tape or a compact disc (hereinafter referred to as "CD") on
which music information is recorded, or other sound sources. Control system and method of an
audio device to which so-called acoustic correction is performed, such as emphasizing a specific
frequency band by using H.2) or sound field correction by using a digital sound processor
(hereinafter referred to as "DSP") The technology relating to is widely known. In particular, in
recent years, on-vehicle audio devices equipped with such acoustic correction functions are
becoming widespread. Therefore, when installing such an audio device in a car, a specialist such
as a dealer sets the network gain while adjusting to the desired frequency characteristic while
listening to the sound actually coming out of the speaker after installation. By doing this, the
setting was optimized for the acoustic environment of the car.
[0003] In such an on-vehicle audio apparatus, the size and shape of the compartment, the
material of the seat, and the accessories and the like in the car differ depending on the car, so the
acoustic environment is not the same. That is, even when acoustic correction such as similar
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network gain setting is performed, the same acoustic effect is not necessarily obtained.
[0008] However, in the above-mentioned prior art, in order to adjust the network gain while
actually listening to the sound coming from the speaker, not only it takes a lot of time for
adjustment, but also the type of music piece to be played or Adjustment results differ depending
on the skill of the expert to adjust and the mood at that time, and there was a problem that
universal adjustment could not be performed. Furthermore, when it comes to adjusting the level
difference between the front and rear sides of the car, it was a difficult skill for experts.
[0006]
Also, if the user can not know objective data of this network gain setting, and if the data stored in
the memory in the device is lost for some reason, the same network gain is set. There was also a
problem that it was very difficult to do.
[0007]
The present invention solves the problems of the prior art as described above, and can perform
universal adjustment of network gain in a short time, and easily make the level difference
between the front side and the rear side of a car It is an object of the present invention to provide
a network gain automatic setting method of an excellent audio device which can be adjusted to
the same network gain even if data stored in the memory is lost.
[0012]
SUMMARY OF THE INVENTION In order to achieve the above-described conventional object, the
present invention divides the frequency band of the audio signal to be handled into a plurality of
bands, and replaces the audio signal with a speaker according to the reference audio signal. The
average level of each of the bands is determined for the measurement curve which measures the
obtained voice, and the average level of each one of the target curve and the average level of any
one of the bands of the measurement curve is calculated. Shifting is performed so that the
difference disappears, and the difference value between the average level of the target curve and
the average level of the measurement curve in each of the remaining bands is used as the
network gain value of each band.
Reference numeral 2 denotes a DSP unit as sound correction means, which applies sound
correction to the sound signal output from the center unit 1 to create a sound signal having a
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desired frequency characteristic. A main amplifier 3 amplifies and outputs an analog audio signal
output from the DSP unit 2. A speaker 4 receives an audio signal from the main amplifier 3 and
generates a sound.
[0014] According to the present invention, therefore, the universal adjustment of the network
gain can be performed in a short time, and the level difference between the front side and the
rear side of the car can be easily adjusted and stored in the memory. Even if lost data is lost, it
can be set to the same network gain. FIG. 2 is a block diagram showing the internal configuration
of the DSP unit 2 in FIG. In FIG. 2, reference numeral 20 denotes an audio input unit, which
selectively selects either an audio signal output from the center unit 1 or a reference audio signal
output from the analyzer 6 according to a given selection signal. Input to the next stage.
Reference numeral 21 denotes a parametric equalizer (hereinafter referred to as "P-EQ
adjustment unit"), which emphasizes a specific frequency band by given parameter data and
corrects the frequency characteristic of the input audio signal.
[0016] Embodiments of the present invention will be described in detail with reference to the
drawings. Reference numerals 26 to 29 denote D / A conversion units, which convert digital
audio signals for each band sent from the network adjustment unit 22 into analog audio signals.
The D / A conversion unit 26 is for a subwoofer, and converts and outputs ultra low-pass audio
signals of L channel and R channel. The D / A conversion unit 27 is for the woofer, and converts
and outputs a total of four channels of low-pass audio signals of L channel and R channel for
front and rear. Similarly, the D / A conversion units 28 and 29 respectively convert the midrange and high-range audio signals of the L channel and the R channel for the front and rear
channels and output the converted signals. Therefore, the D / A converters 26 to 29 convert the
total of 14 channels of digital audio signals into analog audio signals and send out.
[0011] FIG. 1 is a block diagram showing the configuration of a system to which the method for
automatically setting the network gain of an audio device according to the present invention is
applied. In FIG. 1, among the connection lines connecting the blocks, those shown by solid lines
are signal lines for transmitting audio signals, and those shown by dotted lines are control lines
for transmitting control signals. Reference numeral 1 denotes a center unit as a main unit, which
receives instructions from the operation unit and receives master commands loaded therein to
control each unit as a sound source such as a tuner unit, a tape deck, a CD deck, or a CD
autochanger. The slave microcomputers are intensively controlled via a computer line, and the
audio signal of the source corresponding to the operation is selected and output.
[0013] An audio analyzer 5 comprises an analyzer 6 and a personal computer 7. A control line
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between the personal computer 7 and the DSP unit 2 is constituted by RS232C, and a signal line
from the analyzer 6 to the DSP unit 2 is constituted by an optical cable. A microphone 8 receives
an audio signal obtained by collecting the sound generated from the speaker 4 into the analyzer
6. Reference numeral 1 a denotes a remote control for remotely operating the center unit 1.
[0015] Reference numeral 22 denotes a network adjustment unit, which divides an audio signal
sent from the P-EQ 21 into a plurality of frequency bands, performs gain control and outputs it,
and adjusts the transmission time until reaching each speaker. It also performs alignment
correction. A communication unit 23 processes control signals transmitted to and from the
personal computer 7. In this embodiment, the communication unit 23 comprises an RS232C
interface. A microcomputer 24 controls the operation of the DSP unit 2. A backup memory 25 is
a storage means for storing parameter data for sound correction by the P-EQ 21 and is
constituted by an E2 PROM or the like.
[0017] FIG. 3 is a block diagram showing the internal configuration of the audio analyzer 5 in
FIG. In the analyzer unit 6 shown in FIG. 3, a microphone sound analysis unit 60 converts an
analog audio signal input from the microphone 8 into a digital signal, analyzes this audio signal
with a built-in microcomputer, and sends out analysis data At the same time, control signals are
transmitted to and from the personal computer 7. Reference numeral 61 denotes a measurement
noise generating unit, which transmits a reference audio signal as pink noise to the DSP unit 2
and transmits a control signal to and from the personal computer 7 by a built-in microcomputer.
[0018] In the personal computer shown in FIG. 3, reference numeral 70 denotes a control unit
comprising a microcomputer or the like, and as described above, control signals are transmitted
between the microphone sound analysis unit 60 and the measurement noise generation unit 61
of the analyzer unit 6. Transmit A communication unit 71 communicates with the communication
unit 23 of the DSP unit 2 based on the communication procedure of RS232C, the parameters of
the P-EQ adjustment unit 21 of the DSP unit 2, the time alignment of the network adjustment
unit 22, and the network gain. Transmission of control signals and data to make decisions.
[0019] Reference numeral 72 denotes a key input unit, which can set the frequency
characteristic of the audio signal to a desired characteristic curve (hereinafter referred to as a
"target curve") by key operation. Reference numeral 73 denotes a display unit, which displays a
main menu at the time of automatic adjustment, a tuning menu, confirmation of speaker
connection confirmation, etc., and various data during adjustment. A printing unit (printer) 74
can print not only result data after completion of adjustment but also arbitrary data during
adjustment.
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[0020] Reference numeral 75 denotes a data storage unit, which can store and save parameter
data of P-EQ 21, data of time alignment and network gain, and data of a target curve on a
recording medium such as a floppy disk or hard disk. . Therefore, after the current setting data is
stored in the data storage unit 75 when performing the automatic adjustment, it is possible to
restore the original setting data even if the result of the automatic adjustment can not obtain a
desired characteristic.
[0021] In the network automatic setting method according to the present embodiment, the
measurement curve of the speaker audio signal obtained from the speaker through the
microphone 8 according to the pink noise, that is, the measured frequency characteristic is
compared with the set target curve. It is realized by the method of adjusting the network gain.
[0022] In the present embodiment, the speakers on the front side have a 4-way configuration of
High, Mid, Low and Sub-woofer, and the rear side has a 3-way configuration of High, Mid and
Low. Therefore, the front side is divided into four bands, and the rear side is divided into three
bands. Each divided band is set by the input of the cutoff frequency. Further, in the division of
each band, a slope is provided at the boundary to prevent the output of the speaker from
changing frequently with respect to the sound near the boundary. The slope is determined by the
slope of the gain increase or decrease level at the frequency next to the cutoff frequency.
[0023] FIG. 4 is a diagram showing a target curve on the front side and a measured frequency
characteristic, that is, a measurement curve, in an audio frequency band from 20 Hz to 20 kHz. 5
to 8 show the process of automatically setting the network gain. FIG. 9 is a flowchart showing a
method of automatically setting a network gain in the present embodiment. The network gain
automatic setting method of the present invention will be described with reference to FIGS. 4 to
9.
[0024] In FIG. 9, first, when the set target curve can be corrected, its frequency characteristic is
measured (step S1). The measured frequency characteristics are displayed as a bar graph S with
31 bands as the entire band as shown in FIG. Then, the average value of the target curve of each
divided band is calculated (step S2), and the average value of the frequency characteristics of
each measured band is calculated (step S3). FIG. 5 shows an average value Ia for each band of the
target curve I and an average value Sa for each band of the measured frequency characteristic S.
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[0025] Next, relative movement is performed so that the difference between the average value of
the target curve and the average value of the frequency characteristic in an arbitrary band, that
is, an arbitrary network disappears (step S4). That is, as shown in FIG. 6, the shift (shift) is
performed so that the difference between the average value Ia2 of the target curve of the Low
band and the average value Sa2 of the frequency characteristic disappears.
[0026] FIG. 7 is a view showing a state in which the difference between the average value of the
target curve and the average value of the frequency characteristic is eliminated (superimposed
on the graph). In FIG. 7, the difference value between the average value of the target curve in
each of the remaining bands and the average value of the frequency characteristics is taken as
the network gain value to be set in each band (step S5).
[0027] Then, the data of the network gain value is sent from the audio analyzer 5 to the DSP unit
2 to set the network gain. The same processing is performed on the rear side to set the network
gain.
[0028] Furthermore, when the difference between the front and rear target curves is determined
(step S6), in this case, if the average level of the entire target curve is taken, the lower / higher
range of the upper and lower limits of the audible band There is a risk that the average level may
drop. In practice, it is more realistic to compare the average levels in the range of the midrange
where the human ear can hear it well. Therefore, in the present embodiment, the average level
value when obtaining the front / rear level difference is obtained from several points in the
midrange, and the difference is used as the front / rear level difference of the network gain. That
is, as shown in FIG. 8, an average level value of four points of 320 Hz, 400 Hz, 500 Hz and 630
Hz is used to obtain target curve difference = front average level value-rear average level value.
[0029] Similarly, the frequency characteristics of the front side and the rear side are measured
(step S7), and the frequency characteristic difference, that is, the measurement curve difference
is obtained from the front / rear frequency characteristics at four frequency points shown in FIG.
Step S8).
[0030] Frequency characteristic difference = front average level value-rear average level value
The difference between the two is substituted into the following equation to obtain a level
difference value from each curve difference (step S9).
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[0031] Level difference value = frequency characteristic difference−target curve difference Next,
it is judged whether the obtained level difference value is positive (step S10), and when this value
is positive, this difference from the front network gain value The value is subtracted (step S11),
and when this value is negative, this difference value is subtracted from the rear network gain
value (step S12).
[0032] The front / rear network gain values obtained in this manner are used as the final
attenuation data of the audio output in the network adjustment unit 22 of the DSP unit 2 shown
in FIG. Although this attenuator data is registered in the backup memory 25 of the DSP unit 2
and is also stored in the data storage unit 75 of the audio analyzer 5 at the same time, the same
network is used even if the data in the backup memory 25 is lost. Gain settings can be
reproduced.
[0040] As is apparent from the above embodiments, according to the method of automatically
setting the network gain of the audio device of the present invention, it is possible to perform
universal adjustment of network gain in a short time, and at the front of a car It is possible to
easily adjust the level difference between the rear side and the rear side, and even when the data
stored in the memory is lost, an effect of being able to be set to the same network gain can be
obtained.
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