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DESCRIPTION JPH06311581

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DESCRIPTION JPH06311581
[0002]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
gain adjustment system for an amplifier for adjusting the level of 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 who
is a person in charge of a store or the like who is a tuning shop listens to the sound actually
coming out of the speaker after installation. The parameter data was changed or the amplifier
gain was changed, the data was stored in the memory in the device, and the optimum adjustment
was made to 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, when adjusting the amplifier gain in the above-mentioned prior art, the person
in charge of the tuning shop listens to the sound outputted from the speaker while adjusting the
gain adjustment knob (not shown) on the back of the amplifier. However, since the adjustment
takes place with a driver or the like, the operation time is very long, and since the person in
charge relies on the hearing, there is a problem that the gain adjustment varies.
[0006]
The present invention has been made in view of the above problems, and an object of the present
invention is to provide a gain adjustment system for an amplifier capable of eliminating variation
in gain adjustment while largely reducing the working time. To provide.
[0011]
SUMMARY OF THE INVENTION In order to achieve the above object, the present invention
provides an acoustic correction means for applying acoustic correction to an audio signal
obtained from a predetermined sound source, and from the acoustic correction means in
accordance with a predetermined operation. Amplification means for changing the amplification
factor of the audio signal, a speaker for generating sound according to the audio signal obtained
from the amplification means, a microphone for collecting the sound generated from the speaker,
and a reference audio signal Acoustic characteristic setting means for analyzing the audio signal
supplied to the acoustic correction means and obtained from the microphone, calculating the
level of the sound from the speaker based on the analysis result, and determining whether the
level is within a predetermined range The acoustic characteristic setting means has a display
means for displaying the frequency characteristic of the audio signal in real time and notifying
that the level is out of a predetermined range. . Reference numeral 5 denotes an audio analyzer
as acoustic characteristic setting means constituting the characteristic system of the present
invention, which comprises an analyzer 6 and a 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.
[0013] With this configuration, the frequency characteristic of the audio signal is displayed in
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real time on the display means while adjusting the amplification factor of the amplification
means by a predetermined operation, and the level of the frequency characteristic of the audio
signal deviates from the predetermined range. In this case, the instruction display can be
performed by the display means, and the amplification factor can be adjusted in real time based
on the instruction display, so the working time can be significantly shortened and variations in
amplification factor can be reliably prevented. can do. 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 to adjust the transmission time to 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.
[0015] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A gain adjustment system
for an amplifier according to the present invention will be described below with reference to the
drawings. FIG. 1 is a block diagram showing a configuration of an automatic adjustment system
of an audio device to which a gain adjustment system of an amplifier 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 commands from the operation unit and receives master units mounted
in the inside to control each source 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.
FIG. 3 is a block diagram showing an 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, the control signal is 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.
[0010] 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
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generates a sound.
[0012] 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.
[0014] 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 mid-range 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 a total of 14
channels of digital audio signals into analog audio signals and send them out.
[0016] In the personal computer shown in FIG. 3, the control unit 70 comprises a microcomputer
and 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 and the time alignment and network gain of the network adjustment
unit 22. Transmission of control signals and data to make decisions.
[0017] A key input unit 72 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.
[0018] A data storage unit 75 can store and save 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
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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.
[0019] Next, an automatic adjustment method using the automatic adjustment system of the
audio device will be described. FIG. 4 is a flow chart showing an automatic adjustment method in
the embodiment. 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 two input terminals.
[0020] 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). .
[0021] Here, when an 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.
[0022] 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.
[0023] After the network setting, the process shifts to amplifier gain adjustment (step S5). In this
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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 as described later, the volume from the speaker 4 is made in advance. Set
to a fixed value.
[0024] Next, the process proceeds to time alignment adjustment (step S6). The positions at which
the speakers 4 are arranged in the vehicle compartment differ in the transmission distance from
the sound source, so the time for the audio signals output from the main amplifier 3 to reach the
speakers 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.
[0025] 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.
[0026] 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.
[0027] 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. The level difference adjustment of the L channel
and the R channel is to correct a slight change in the level difference due to the setting of the
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parameter in the P-EQ adjustment.
[0028] Next, the tuning result is displayed, and the tuning result is printed from the printing unit
74 of the personal computer unit 7 in response to the user's key operation for print selection
(step S12).
[0029] 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 cabin, etc. 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.
[0030] When auto tuning is completed and all tuning operations are completed, it is determined
whether or not to return to the state 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).
[0031] 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 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.
[0032] 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.
[0033] By the way, in the amplifier gain adjustment of step S5 in the flow chart of FIG. 4, the
amplifier gain of the input and output of the DSP unit 2 is adjusted, but the level of the sound
from the speaker 4 is also changed by the gain adjustment knob 3a of the amplifier 3. Do.
Therefore, during auto-tuning, the gain adjustment knob 3a of the amplifier 3 is set at, for
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example, an intermediate position.
[0034] Next, the case of manually adjusting the gain of the amplifier 3 will be described with
reference to the flow chart of FIG.
[0035] As shown in FIG. 3, the pink noise output from the measurement noise generating unit 61
of the audio analyzer 5 is output from the speaker 4, and the pink noise from the selected
speaker 4 is collected by the microphone 8 for collection. The pink noise produced is supplied to
the control unit 70 via the microphone sound analysis unit 60.
[0036] As shown in FIG. 5, the frequency characteristic of the pink noise is measured (step S21).
The frequency characteristic and the current network setting value are displayed on the display
unit 73 of the personal computer 7 (step S22). It is determined whether the gain level of the
LOW band of the frequency characteristic is within the predetermined range of 70 dB to 80 dB
(step S23). If it is within the predetermined range, “OK” is displayed on the display section 73
of the personal computer 7 to urge the user not to adjust the level of the LOW band (step S24).
[0037] If it is not within the predetermined range, it is determined whether the current level is
70 dB or less (step S25). If it is 70 dB or less, “UP” is displayed on the display unit 73 to
prompt the user to increase the gain level of the LOW band (step S 26). Also, if it is not 70 bB or
less, "DOWN" is displayed on the display unit 73 to prompt the user to lower the gain level of the
LOW band (step S27).
[0038] Next, it is determined whether or not the gain level of the MID band of the frequency
characteristic is within a predetermined range of 70 dB to 80 dB (step S28). If it is within the
predetermined range, “OK” is displayed on the display unit 73 to urge the user not to adjust
the level of the MID band (step S29).
[0039] If it is not within the predetermined range, it is determined whether the current level is
70 dB or less (step S30). If it is 70 dB or less, "UP" is displayed on the display unit 73 so as to
raise the gain level of the MID band (step S31). Also, if it is not 70 dB or less, "DOWN" is
displayed to lower the gain level of the MID band (step S32).
[0040] Next, it is judged whether or not the gain level of the HIGH band of the frequency
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characteristic is within a predetermined range of 70 dB to 80 dB (step S33). If it is within the
predetermined range, “OK” is displayed on the display unit 73 to urge the user not to adjust
the level of the HIGH band (step S34).
[0041] If it is not within the predetermined range, it is determined whether the current level is
70 dB or less (step S35). If it is 70 dB or less, "UP" is displayed on the display unit 73 so as to
raise the gain level of the HIGH band (step S36). If not less than 70 dB, "DOWN" is displayed to
lower the gain level of the HIGH band (step S37).
[0042] Next, it is determined whether or not the gain level of the SUB-WOOFER band of the
frequency characteristic is within the predetermined range of 70 dB to 80 dB (step S38). If it is
within the predetermined range, “OK” is displayed on the display unit 73 to urge the user that
there is no need to adjust the level of the SUB-WOOFER band (step S39).
[0043] If it is not within the predetermined range, it is determined whether the current level is
70 dB or less (step S35). If it is 70 dB or less, "UP" is displayed on the display unit 73 so as to
raise the gain level of the SUB-WOOFER band (step S36). If not less than 70 dB, "DOWN" is
displayed to lower the gain level of the SUB-WOOFER band (step S37).
[0044] The user adjusts the gain level of each band within a predetermined range by adjusting
the gain adjustment knob 3a of the amplifier 3 with a driver based on the series of instruction
display for each band, and the adjustment is completed. For example, the instruction display on
the display unit 73 is ended (step S38).
[0045] Therefore, according to the gain adjustment system of the amplifier of the present
invention configured as described above, the pink noise frequency characteristic is displayed on
the display unit of the personal computer 7 while adjusting the gain level of the amplifier 3 by a
predetermined operation. 73 is displayed in real time, and when the level of the frequency
characteristic of the pink noise deviates from the predetermined range, an instruction is
displayed, and the gain level of the amplifier 3 is adjusted in real time based on the instruction.
Since this can be done, the working time can be significantly reduced, and moreover, variations
in gain level can be reliably prevented.
[0046] In steps S26 and S27, steps S31 and S32, steps S36 and S37, and steps S41 and 42, in
addition to the instruction display such as "DOWN" and "UP", the user uses the synthesized voice
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as a voice message. If the notification means for notifying to is provided, it is possible to adjust
the gain level without looking at the screen, and it is possible to obtain further effects.
[0054] As apparent from the above embodiment, according to the gain adjustment system of the
amplifier of the present invention, the frequency characteristic of the audio signal can be
displayed on the display means in real time while adjusting the amplification factor of the
amplification means by a predetermined operation. In addition, when the level of the frequency
characteristic of the audio signal deviates from the predetermined range, the instruction display
is performed by the display unit, and the amplification factor of the amplification unit is adjusted
in real time based on the instruction display. As a result, the working time can be greatly
reduced, and variations in amplification factor can be reliably prevented.
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