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JPH06311592

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DESCRIPTION JPH06311592
[0002]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
data communication method of an audio apparatus for applying acoustic correction to an audio
signal obtained from a predetermined sound source.
[0004]
2. Description of the Related Art For a voice signal obtained from a recording medium, such as a
tape or CD, on which music information is recorded, or another sound source, a specific
frequency using a parametric equalizer (hereinafter referred to as "P-EQ") Techniques relating to
audio devices that perform so-called acoustic correction, such as emphasizing a band or
performing sound field correction using a digital sound processor (hereinafter referred to as
"DSP"), are 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 DSP and P-EQ parameters
while listening to the sound actually coming out of the speaker after installation. Or, the amplifier
gain is changed, the setting data is stored in the memory of the sound correction means in the
device, and the adjustment that is optimum for the sound environment of the car is performed.
[0003] In such a car-mounted audio device, setting data as a basis of acoustic correction is stored
in advance, and acoustic correction is applied to the audio signal according to a predetermined
acoustic correction command. However, since the size and shape of the cabin, the material of the
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seat, and the accessories in the vehicle differ depending on the car, the acoustic environment is
not the same. That is, even when sound correction using the same setting data is performed, the
same sound effect is not necessarily obtained.
[0008] However, in the above-described conventional techniques, setting data is changed while
listening to the sound actually emitted from the speaker, so that it takes a long time to determine
the setting data. .
[0006]
The present invention solves the problems of the prior art as described above, and transmits
setting data to the sound correction means by the communication means to perform automatic
tuning and constantly monitoring the connection state of the communication line. It is an object
of the present invention to provide a data communication method of an excellent audio device
which enables quick and reliable determination of setting data.
[0011]
SUMMARY OF THE INVENTION In order to achieve the above-described conventional object, the
present invention stores setting data to be subjected to acoustic correction, and performs voice
correction on an audio signal obtained from a predetermined sound source according to the
setting data. Sound correction means, a speaker for generating sound according to the sound
signal corrected by the sound correction means, sound characteristics for analyzing the sound
generated from the speaker and automatically tuning the setting data of the sound correction
means Setting means, and communication means for transmitting the determined setting data
from the acoustic property setting means to the acoustic correction means, and the connection
between the acoustic property setting means and the acoustic correction means is confirmed at
predetermined time intervals during automatic tuning. A command is transmitted, and it is
determined whether or not response data corresponding to the transmitted connection
confirmation command is received from the acoustic characteristic setting means, and the
response data is received. If you do not want to emit an error warning. Reference numeral 2
denotes a DSP unit as acoustic correction means, which can perform acoustic correction on the
audio signal output 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. A
speaker 4 receives an audio signal from the main amplifier 3 and generates a sound.
[0013] Therefore, according to the data communication method of the audio device of the
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present invention, setting data is transmitted while constantly monitoring the communication
line, so that setting data can be determined quickly and reliably. 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. input. Reference numeral 21 denotes P-EQ, which emphasizes a specific
frequency band according to given parameter data and applies acoustic correction to the
frequency characteristics of the input audio signal.
[0015] 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.
[0010] FIG. 1 is a block diagram showing the configuration of a system to which a data
communication method for 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.
Control the slave microcomputers intensively through the computer line, select and output the
audio signal of the source according to the operation
[0017] 。 In the personal computer shown in FIG. 3, reference numeral 70 denotes a control unit
constituted by 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 Transmit Reference numeral 71 denotes a communication unit, which
determines the parameters of the P-EQ 21 of the DSP unit 2 and the time alignment of the
network adjustment unit 22 and the network gain based on the communication procedure of
RS232C with the communication unit 23 of the DSP unit 2 Transmission of control signals and
data.
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[0012] 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.
[0014] 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. Reference numeral 23 denotes a communication unit as communication
means, which processes control signals transmitted between the personal computer 7 and, in this
embodiment, is constituted by 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.
[0016] 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.
[0018] A key input unit 72 can set the frequency characteristic of the audio signal to a desired
characteristic curve (hereinafter referred to as "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.
[0019] 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
disk. Therefore, after the current setting data is stored in the data storage unit 75 when
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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.
[0020] Next, the data communication method of this audio device will be described. FIG. 4A is a
flowchart showing a data communication method in the audio analyzer 5 in the embodiment of
the present invention, and FIG. 4B is a flowchart showing processing of command reception in
the DSP unit 2.
[0021] In FIG. 4A, first, the audio system and the DSP unit 2 (DSP unit) are connected (step S11).
Then, it is determined whether or not the automatic tuning is in progress (step S12). If the
automatic tuning is in progress, it is determined whether or not a predetermined time has
elapsed (step S13). When the predetermined time has elapsed, the audio analyzer 5 transmits a
connection confirmation command to the DSP unit 2 (step S14), and it is determined whether or
not there is response data from the DSP unit 2 (step S15). If there is no response data, an
unconnected error warning is displayed on the display section 73 of the audio analyzer 5 (step
S16).
[0022] If there is response data in step S15, the process proceeds to step S12, and each process
up to step S15 is continuously executed until automatic tuning is completed.
[0023] On the other hand, when the microcomputer 24 receives this command from the audio
analyzer 5, the DSP unit 2 executes the command reception operation shown in FIG. 4 (b). That
is, it is determined whether or not a connection confirmation command has been received (step
S21), and if it has been received, response data is transmitted (step S22).
[0024] As described above, during automatic tuning, the audio analyzer 5 transmits a command
to the DSP unit 2 at fixed time intervals to transmit setting data while constantly monitoring the
RS232C communication line. It is possible to transmit data quickly and reliably.
[0032] As is apparent from the above embodiments, according to the present invention, the
setting data for acoustic correction is transmitted by the communication means at the time of
automatic tuning of the acoustic correction means for applying acoustic correction to the audio
signal. Also, since the communication line is constantly monitored during data transmission,
quick and reliable determination of setting data is possible.
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