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JPH06311593

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DESCRIPTION JPH06311593
[0002]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
method for preventing erroneous tuning of an audio apparatus when tuning an acoustic
correction means for applying acoustic correction to an audio signal.
[0004]
2. Description of the Related Art A parametric equalizer (hereinafter referred to as "a digital
signal processor") is used for an audio signal obtained from a recording medium such as a tape
or compact disc (hereinafter referred to as "CD") on which audio information such as music
information is recorded. Adjustment of an audio device that performs so-called acoustic
correction such as emphasizing a specific frequency band using P-EQ) or performing sound field
correction using a digital sound processor (hereinafter referred to as "DSP") Techniques relating
to systems and adjustment methods 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
parameter data of DSP and P-EQ while listening to the sound actually coming out of the speaker
after installation. The data was stored in the memory in the device, and the adjustment was
optimally performed 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 parameter data of the
DSP and P-EQ while actually listening to the sound coming from the speaker, it takes not only a
great deal of time for adjustment, but also a performance Depending on the type of music to be
played, the skill of the expert to adjust, and the mood at that time, the adjustment result varies,
and universal adjustment can not be performed. It is an object of the present invention to provide
an excellent method of preventing erroneous tuning which can prevent erroneous tuning even if
an operation command is erroneously inputted from the main body device or the sound
correcting means in the above-mentioned system. .
[0006]
Therefore, the applicant of the present invention has proposed an automatic adjustment system
and an automatic adjustment method which can perform universal tuning of the acoustic
correction means in a short time by the acoustic characteristic setting means simultaneously with
the application of the present application.
[0007]
In such a system, tuning is performed by connecting the acoustic characteristic setting means to
the acoustic correction means while maintaining a state in which the main unit for transmitting
an audio signal obtained from a predetermined sound source is connected to the acoustic
correction means. There is.
That is, the system is constructed on the premise that no operation command is input from the
main body device and the sound correction means during such tuning. However, if the operation
command is input from the main device or the sound correction means for some reason,
erroneous tuning may occur.
[0013] SUMMARY OF THE INVENTION In order to achieve the above-described conventional
object, the present invention is directed to a main unit for transmitting an audio signal obtained
from a predetermined sound source, and to an operation command from the main unit or
operation unit. Sound correction means for applying the set sound correction to the sound signal,
a speaker for generating a sound according to the sound signal obtained from the sound
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correction means, and a microphone for collecting the sound generated from the speaker A
reference sound signal supplied to the sound correction means, the sound signal obtained from
the microphone is analyzed, and an acoustic characteristic setting means for tuning the sound
correction means on the basis of the analysis result; Prohibits input of operation commands from
the main body device and the sound correction means. Reference numeral 1a denotes a remote
control for remotely operating the center unit 1, and 1b denotes a key operation unit of the
center unit 1. Operation commands from the remote controller 1a and the key operation unit 1b
are transmitted by control lines.
[0015] Therefore, according to the present invention, erroneous tuning can be prevented even
when an operation command is erroneously input from the main unit or the sound correction
means during tuning. An audio analyzer 5 as acoustic characteristic setting means is comprised
of 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.
[0017] Embodiments of the present invention will be described in detail with reference to the
drawings. Reference numeral 22 denotes a network adjustment unit, which divides the audio
signal sent from the P-EQ 21 into a plurality of frequency bands and outputs the divided signals,
and also adjusts the transmission time to each speaker so-called time alignment correction. 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 of P-EQ 21, time alignment, and network gain, and is
constituted by an E 2 PROM or the like.
[0012] FIG. 1 is a block diagram showing the configuration of a system to which the method for
preventing erroneous tuning 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 a key operation unit to be described later, and uses a master
microcomputer mounted therein as sound sources such as a tuner unit, a tape deck, a CD deck,
and a CD auto changer. The slave microcomputers of the source unit are intensively controlled
via a computer line, and the audio signal of the source corresponding to the operation is selected
and output.
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[0014] 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 provide a sound field with a rich
sense of reality and a sound signal with frequency characteristics preferred by the user. Create. A
power amplifier 3 amplifies and outputs an analog audio signal output from the DSP unit 2. The
power 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 power amplifier 3 and generates a sound.
[0016] 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. Output. Reference numeral 21 denotes P-EQ, which
emphasizes a specific frequency band by given parameter data and corrects the frequency
characteristic of the input audio signal.
[0018] 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 converter 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 a woofer, and converts and outputs a
total of four low-channel 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. A key input unit 30 can input an operation command similar to the operation
command from the center unit 1.
[0019] 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, control signals are
transmitted to and from the personal computer 7. Reference numeral 61 denotes a measurement
noise generation unit, which transmits a reference voice signal which is pink noise for
measurement to the DSP unit 2 and transmits a control signal to and from the personal computer
7 by a built-in microcomputer.
[0020] 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
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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.
[0021] Reference numeral 72 denotes a key input unit, which can set the frequency
characteristic of an 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.
[0022] 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 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.
[0023] In the system configuration shown in FIGS. 1 to 3, the reference audio signal from the
measurement noise generating unit 61 is supplied to the DSP unit 2 by an optical cable and is
input to the speaker 4 through the power amplifier 3. Then, an audio signal in which the sound
from the speaker 4 is collected by the microphone is input to the microphone sound analysis unit
60 and analyzed. Communication is performed with the DSP unit 2 based on the analysis result,
and the DSP unit 2 is tuned automatically or manually. In the case of automatic tuning, the
adjustment time can be about 30 minutes, and a universal adjustment can be made which does
not depend on the skill or mood of the adjusting professional. 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.
[0024] Even during this tuning, the center unit 1 is connected to the DSP unit 2 together with the
audio analyzer 5. This is after the end of tuning, without changing the connection one by one, by
actually receiving the actual audio signal and control signal from the center unit 1, the speaker 4
actually hears the tuning state by sound and confirms It is convenient to do. On the other hand,
during this tuning, it is necessary to take measures not to cause erroneous tuning even when the
operation command from the center unit 1 or the operation command from the key input unit 30
of the DSP unit 2 is inputted erroneously.
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[0025] FIGS. 4 to 6 are flow charts showing the operation for preventing such erroneous tuning.
Hereinafter, a method for preventing erroneous tuning according to the present invention will be
described with reference to FIGS. 4 to 6. 4 is a flowchart showing the operation of the audio
analyzer 5, FIG. 5 is a flowchart showing the operation of the DSP unit 2, and FIG. 6 is a
flowchart showing the operation of the center unit 1.
[0026] In FIG. 4, when the tuning mode by the audio analyzer 5 is started (step S11), the "key
acceptance prohibition command" for prohibiting key input from the remote control 1a, key
operation unit 1b and key input unit 30 of the DSP unit 2 is performed. Are sent to the DSP unit
2 (step S12). Thereafter, the tuning operation is started (step S13), and the end of the tuning is
determined (step S14). When the tuning is ended, it is determined whether or not the key input
of the remote controller a or the like is prohibited (step S15). If the key input is prohibited, the
key input is released, and a "key acceptance permission command" for permitting the key input is
transmitted to the DSP unit 2 (step S16).
[0027] In FIG. 5, when the DSP unit 2 receives the "key acceptance prohibition or permission
command" from the audio analyzer 5 (step S21), the DSP unit 2 determines whether the received
command is a prohibition command (step S22), If the command is not a prohibited command, the
key input from the key input unit 30 is permitted to be accepted, and the "key acceptance
permission command" is transmitted to the center unit 1 (step S23). On the other hand, when the
received command is the "key acceptance prohibition command", the acceptance of the key input
from the key input unit 30 is inhibited and the "key acceptance prohibition command" is
transmitted to the center unit 1 (step S24). .
[0028] In FIG. 6, when the center unit 1 receives the "key acceptance prohibition or permission
command" from the DSP unit 2 (step S31), it determines whether the received command is a
prohibition command (step S32), If the command is not the "key acceptance prohibition
command", acceptance of key input from the remote controller 1a and the key operation unit 1b
is permitted (step S33). On the other hand, when the received command is a "key acceptance
prohibition command", acceptance of key input from the remote controller 1a and the key
operation unit 1b is inhibited (step S34).
[0029] As described above, by prohibiting key input of the remote controller 1a of the center
unit 1 during tuning of the audio analyzer 5, erroneous tuning due to an erroneous operation or
the like can be prevented.
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[0037] As is apparent from the above embodiments, the present invention prohibits key input
from the remote control or key operation unit of the audio apparatus while the acoustic
characteristic setting means is tuning the acoustic correction means of the audio apparatus. Even
when an operation command is given to the sound correction means due to an incorrect
operation or the like, erroneous tuning can be prevented.
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