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JPH06311585

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DESCRIPTION JPH06311585
[0002]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
adjustment system and method of an audio apparatus for applying acoustic correction to 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 changes the data of the P-EQ parameters while listening to the sound actually coming
out of the speaker after installation. The amplifier gain was changed, the data was stored in the
memory in the device, and the adjustment 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
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acoustic environment is not the same. That is, even when the same sound correction operation
setting is performed, the same sound effect is not necessarily obtained.
[0008] However, in the above-mentioned prior art, in order to change the parameters of the P-EQ
or change the amplifier gain while listening to the sound actually coming out of the speaker, it
takes a lot of time for adjustment. Not only that, but the result of adjustment varies depending on
the type of music to be played, the skill of the expert to adjust, and the mood at that time, and
there is a problem that universal adjustment can not be performed.
[0006]
Also, if the user can not know objective data of acoustic correction, and data stored in the
memory in the device is lost for some reason, adjustment to the same acoustic correction should
be made. Was also very difficult.
[0007]
The present invention solves the problems of the prior art, and can perform universal adjustment
in a short time, and also, even when data stored in memory is lost, the same one can be obtained.
It is an object of the present invention to provide an automatic adjustment system and an
automatic adjustment method of an excellent audio device which can be adjusted to acoustic
correction.
[0012]
SUMMARY OF THE INVENTION In order to achieve the above-mentioned conventional object, an
automatic adjustment system of an audio device according to the present invention is a main unit
for transmitting an audio signal obtained from a predetermined sound source and an acoustic
correction command according to operation And sound correction means for applying sound
correction set in advance to the sound signal based on the sound correction command, a speaker
for generating a sound according to the sound signal obtained from the sound correction means,
and the sound generated from the speaker Microphone for collecting the sound to be detected,
and a reference audio signal to the sound correction means to analyze the sound signal obtained
from the microphone, and correction setting information for setting the sound correction based
on the analysis result And sound characteristic setting means for supplying the sound correction
means.
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FIG. 1 is a block diagram showing the configuration of an automatic adjustment system for an
audio device according to the present invention. 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.
[0009]
Further, according to the method of automatically adjusting an audio device according to the
present invention, it is preferable to use a reference audio signal as an acoustic correction means
for applying an acoustic correction preset on the basis of an audio signal from the main unit and
an acoustic correction command to the audio signal. To analyze the audio signal obtained by
collecting the sound generated from the speaker with the microphone according to the reference
audio signal, and setting the acoustic correction based on the analysis result. It is supplied to the
sound correction means.
[0015]
Therefore, according to the automatic adjustment system and the automatic adjustment method
of the audio device of the present invention, the sound generated from the speaker is collected
by the microphone according to the reference audio signal supplied to the acoustic correction
means for performing the acoustic correction. Since the audio signal obtained is analyzed and the
adjustment of the acoustic correction is automatically performed based on the analysis result, the
universal adjustment can be performed in a short time, and for the acoustic correction stored in
the memory The same acoustic correction can be adjusted even if the data of are lost. FIG. 2 is a
block diagram showing an 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. Output. Reference numeral 21 denotes a P-EQ adjustment unit, which
emphasizes a specific frequency band according to given parameter data and corrects the
frequency characteristic of the input audio signal.
[0017] 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
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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.
[0013] Reference numeral 2 denotes a DSP unit as acoustic correction means, which can perform
acoustic correction on the audio signal outputted from the center unit 1 to obtain a user-desired
frequency characteristic. A main amplifier 3 amplifies and outputs an analog audio signal output
from the DSP unit 2. The main amplifier 3 can amplify and output audio signals of up to 14
channels as described later. A speaker 4 receives an audio signal from the main amplifier 3 and
generates a sound.
[0014] An audio analyzer 5 as acoustic characteristic setting means constituting the
characteristic system of the present invention comprises the analyzer 6 and the personal
computer 7. A control line 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.
[0016] 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 and outputs the divided signals, and
also adjusts so-called time alignment correction for adjusting the transmission time until
reaching each speaker. It is something to do. 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.
[0018] 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
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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.
[0019] In the personal computer shown in FIG. 3, reference numeral 70 denotes a control unit
comprising a microcomputer or the like, which transmits control signals between the microphone
analysis unit 60 and the measurement noise generation unit 61 of the analyzer unit 6 as
described above. Do. 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.
[0020] 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.
[0021] A data storage unit 75 can store and store P-EQ 21, time alignment, parameter data of
network gain, and data of a target curve in 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.
[0022] Next, an automatic adjustment method using the automatic adjustment system of the
audio device will be described. FIG. 4 is a flowchart showing an automatic adjustment method
according to an embodiment of the present invention. In FIG. 4, first, an audio system and an
audio analyzer are connected (step S1). Specifically, this connection is made by connecting the
optical cable of the analyzer 6 to the audio input terminal of the DSP unit 2 shown in FIG. 1, and
connecting the RS232C cable from the personal computer 7 to the RS232C terminal of the DSP
unit 2. In this case, the audio input terminal is provided with three terminals, and can be
connected to the analyzer 6 while the signal line from the center unit 1 and the signal line from
the not-shown CD autochanger are connected. However, it is also possible to connect the
analyzer 6 in place of the connection of the center unit 1 or the CD auto-checker at the time of
automatic adjustment without providing a terminal dedicated to a special analyzer with one or
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two input terminals.
[0023] When the connection is completed, the current data and backup data are transferred
from the DSP unit 2 to the personal computer 7 by pressing a predetermined key indicating
tuning of the key input unit 72 according to the menu of the main menu of the display unit 73 of
the personal computer 7. At the same time as loading to the main memory (step S2), the display
unit 73 displays the tuning menu. This tuning menu has items such as auto tuning, manual
tuning, parameter adjustment, and sound check confirmation corresponding to the keys of the
key input unit 72, and the tuning item is selected by pressing the corresponding key (step S3). .
[0024] Here, when the item of auto tuning is selected, a menu of position selection is displayed.
In this position selection item, items such as "FULL SEAT" for selecting all the speakers and
"FRONT R" for selecting the R channel on the front part can be selected, and the position for
setting the microphone 8 is selected. A message will be displayed depending on.
[0025] When the position selection is completed, the process shifts to processing of network
setting (step S4). In this network setting, the cutoff frequency, slope and phase of the network
value are selected. For example, in the case of 3 ways, by pressing the corresponding key, the
cutoff frequency of the low pass filter in the low band (Low) is 2 kHz, the slope is 12 dB / oct,
and the phases of L and R channels are “+”. Make a choice.
[0026] After the network setting, the process shifts to amplifier gain adjustment (step S5). In this
adjustment, pink noise which is a reference voice signal is supplied from the measurement noise
generating unit 61 of the analyzer unit 6 to the DSP unit 2, and a sound corresponding to the
pink noise is emitted from the speaker 4. In this case, by adjusting the gain of the amplifier 3
supplying the audio signal to the speaker 4 selected for each speaker 4 and selected by pressing
the corresponding key, the volume from the speaker 4 is determined in advance. Set to
[0027] Next, the process proceeds to time alignment adjustment (step S6). Since the transmission
distance from the sound source is different in the position where each speaker is arranged in the
vehicle compartment, the time for the audio signal output from the main amplifier 3 to reach
each speaker 4 is not the same. Therefore, if no correction is made, the phase of the sound from
each speaker will be disjointed, and the sound quality will be significantly impaired. Therefore,
the network adjustment unit 22 of the DSP unit 2 is provided with delay means for time
correction, and time alignment adjustment is automatically performed.
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[0028] When the time alignment adjustment is completed, processing for target curve input is
performed (step S7). At the time of input of this target curve, first, the current frequency
characteristic is confirmed. Thereafter, either the new setting or the file call of the already set
curve is selected. In the case of the new setting, marks of up to 31 bands are defined on the
frequency axis and displayed as a 31-point line graph. The user marks the frequency point to be
set by key operation while referring to this line graph, and sets the level of the marked point by
key operation.
[0029] When the input of the target curve setting is completed, it is determined whether the
input target curve is within the correction range, that is, whether or not it can be realized (step
S8). If it is determined that it is not within the correction range, a warning is issued to the user to
prompt readjustment of the amplifier gain. Furthermore, if the correction range is not reached
despite readjustment of the amplifier gain, it is prompted to select whether to change the
network value or change the target curve.
[0030] If it is determined in step S8 that the target curve is within the correction range, network
gain adjustment is performed according to the set target curve (step S9), and each channel gain
of the network is automatically set. . Also, P-EQ adjustment is performed (step S10), and f0, Q,
and gain are automatically set. Further, level difference adjustment is performed (step S11), and
the level difference between the L channel and the R channel and the level difference between
the front and rear are automatically adjusted. This is to correct a slight change in the level
difference due to the setting of the parameter in the P-EQ adjustment.
[0031] Next, the tuning result is displayed, and the tuning result is printed from the printing unit
74 of the personal computer 7 in response to the user's key operation for print selection (step
S12).
[0032] Thereafter, it is judged whether or not the tuning has been completed (step S13). This
determination is made based on the user's selection of pressing the key. In this embodiment, the
microphone 8 is installed not only at the driver's seat at the front but also at the front passenger
seat, the entire front, the rear seat side, the entire vehicle room Since auto-tuning is possible even
when installed at a different position, the user is given the choice of performing auto-tuning at
another position or ending auto-tuning.
[0033] When the auto tuning is completed, it is determined whether or not to return to the state
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before adjustment (step S14). This may be the case where the result of the auto-tuning is not the
desired characteristic, so when returning to the condition before adjustment, the data before
adjustment stored in the data storage unit 75 of the personal computer unit 7 is called and Data
transfer is performed (step S15).
[0034] In step S14, if it is not returned to the state before adjustment, it is determined whether
or not the automatically adjusted data is backed up by the key operation of the user (step S16). If
backup is to be performed, data is transferred to the backup memory 25 of the DSP unit 2 (step
S17), and this flow is ended. If backup is not performed, the flow is ended as it is.
[0035] As described above, in the system configurations of FIGS. 1 to 3, the adjustment time can
be shortened to about 30 minutes by performing the automatic adjustment based on the
flowchart of FIG. You can make universal adjustments that don't depend on you or your mood.
Furthermore, even if the data for sound correction stored in the memory is lost, the same sound
correction can be adjusted based on the data stored in the data storage unit 75 of the personal
computer unit 7.
[0036] Although the above embodiment mainly describes the case of adjusting the frequency
characteristics of the audio signal, the present embodiment can also be applied to the case of
creating a sound field such as a concert hall or a live house using a DSP unit. It is also possible to
implement a system that automatically sets sound field correction data by applying the invention.
[0044] As is apparent from the above embodiments, according to the automatic adjustment
system and the automatic adjustment method of the audio device of the present invention,
according to the reference audio signal supplied to the acoustic correction means for performing
the acoustic correction, from the speaker Since an audio signal obtained by collecting a sound to
be generated by a microphone is analyzed, and adjustment of acoustic correction is automatically
performed based on the analysis result, universal adjustment can be performed in a short time,
Even when the data for acoustic correction stored in the memory is lost, an effect is obtained that
the same acoustic correction can be adjusted.
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