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JPH06311588

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DESCRIPTION JPH06311588
[0002]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
method of analyzing the frequency characteristics 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 A parametric equalizer (hereinafter referred to as "P") is used for
an audio signal obtained from a recording medium such as a tape or a compact disc (hereinafter
referred to as "CD") on which information such as music information is recorded. The technology
of an audio apparatus that performs so-called acoustic correction, such as setting of frequency
characteristics and sound field correction using acoustic correction means such as “EQ” or
digital sound processor (hereinafter referred to as “DSP”) is widely known. ing. 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, specialists such
as dealers come out of the speakers of the left channel and the right channel which are actually
arranged on the front side and rear side of the car after installation. While listening to the sound,
the setting data of the DSP was changed, the data was stored in the memory in the DSP, 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 prior art, although the acoustic correction means performs
independent acoustic correction on the audio signals of the left and right channels, it is possible
to use the speakers from the front side or the rear side. Since the sound to be output is the sound
of both channels, there is a problem that the characteristic of the acoustic correction can not be
grasped. The present invention solves such conventional problems, and grasps the frequency
characteristics of the left channel and right channel audio signals applied by the acoustic
correction means, and averages all frequency bands of the audio signals. An object of the present
invention is to provide an excellent audio device frequency characteristic analysis method
capable of grasping a level value.
[0006]
If one tries to listen to the sound of one of the channels separately to judge the characteristics,
both channels will be synthesized after listening, and it is practically impossible to judge the
characteristics.
[0007]
Furthermore, although the level in each frequency band is known, the average level value in all
frequency bands is not known, so there is a problem that the average level value of both
channels can not be adjusted.
[0013]
SUMMARY OF THE INVENTION In order to achieve the above-mentioned conventional objects,
the present invention selects either the left channel speaker or the right channel speaker, and
transmits the selected speaker to the selected speaker through the acoustic correction means and
the power amplifier. A reference audio signal is supplied, and sounds generated from the left
channel speaker or the right channel speaker are independently analyzed according to the
reference audio signal, and frequency characteristics of the left channel audio signal and the
right channel audio signal are simultaneously displayed.
FIG. 1 is a block diagram showing the configuration of an audio system to which a frequency
characteristic analysis method according to the present invention is applied. In FIG. 1, among the
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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.
[0010] Further, the average level value of the entire frequency band of the left channel audio
signal and the right channel audio signal is displayed.
[0016] Therefore, according to the present invention, it is possible to grasp the frequency
characteristics of the audio signal of the left channel and the right channel by the acoustic
correction means and to grasp the average level value of the entire frequency band of the audio
signal. 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 a P-EQ adjustment
unit, which emphasizes a specific frequency band by given parameter data and corrects the
frequency characteristic of the input audio signal.
[0018] 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.
[0014] 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. 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.
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[0015] An audio analyzer 5 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.
[0017] 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 for sound correction by the P-EQ 21 and is
constituted by an E2 PROM or the like.
[0019] In the case of an on-vehicle audio apparatus, the speakers in the vehicle are provided with
speakers for the left channel and the right channel on the front side, and speakers for the left
channel and the right channel on the rear side. Furthermore, in the case of a multi-speaker
system in which a subwoofer is added to 2 WAY, 3 WAY, or this, a maximum of 14 speakers are
provided. 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.
[0020] 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, 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 voice signal as 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.
[0021] In the personal computer shown in FIG. 3, the control unit 70 comprises a microcomputer
and the like, and as described above, transmits control signals between the microphone analysis
unit 60 and the measurement noise generation unit 61 of the analyzer unit 6. Do. A
communication unit 71 communicates with the communication unit 23 of the DSP unit 2 based
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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.
[0022] 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.
[0023] A data storage unit 75 can store and store data such as P-EQ 21, time alignment,
parameter data of network gain, data of a target curve, and the like in a recording medium such
as a floppy disk or hard disk. .
[0024] Next, the frequency characteristic analysis method of this audio device will be described.
FIG. 4 is a flowchart showing a frequency characteristic analysis method (function) in the
embodiment of the present invention. In FIG. 4, first, an audio system and an audio analyzer are
connected (step S1). Then, it is judged whether or not the frequency characteristic display is
selected by the operation command (step S2), and when the frequency characteristic display is
selected, it is judged whether the front selection or the rear selection is made (step S3).
[0025] In the case of front selection, the measurement noise which is the reference voice signal
is output from the audio analyzer 5 (step S4). Then, a speaker in the left or right channel is
selected, and a sound corresponding to the measurement noise is output from the selected
speaker (step S5). The sound due to the measurement noise is input to the audio analyzer 5
through the microphone 8 and analyzed (step S6). The front frequency characteristic of the
analysis result is displayed on the display unit 73 (step S7).
[0026] FIG. 5 (a) shows an example of the display. As shown in this figure, the frequency
characteristics of the left channel (Lch) and the right channel (Rch) are simultaneously displayed.
In this display, the entire frequency band is divided into 31 and displayed as an average level of
each divided frequency range.
[0027] In the case of rear selection in step S3, the measurement noise which is the reference
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voice signal is output from the audio analyzer 5 (step S8). Then, the speaker of the left or right
channel is selected, and the measurement noise is output from the selected speaker (step S9).
The sound due to the measurement noise is input to the audio analyzer 5 through the
microphone 8 and analyzed (step S10). The rear frequency characteristic of the analysis result is
displayed on the display unit 73 (step S11).
[0028] If it is not the frequency characteristic display selection in step S2, it is judged whether
the average level value display selection of the left channel and the right channel or the average
level value display selection of the front side and the rear side is made (step S12) In the case of
the average level display selection of the right channel, it is further determined whether the front
selection or the rear selection is made (step S13). In the case of front selection, the measurement
noise that is the reference audio signal is output from the audio analyzer 5 (step S14), the left
channel or right channel speaker is selected, and the sound corresponding to the measurement
noise is selected from the selected speaker. It outputs (step S15). The sound due to the
measurement noise is input to the audio analyzer 5 through the microphone 8 and analyzed (step
S16). The average level values of the left and right channels on the front side of the analysis
result are displayed on the display unit 73 (step S17).
[0029] An example of display in this case is shown in FIG. 5 (b). In this display example, the left
channel has a smaller level than the right channel. Therefore, setting data for equalizing the
average level values of both channels is transmitted from the audio analyzer 5 to the DSP unit 2
to adjust the network gain.
[0030] In the case of rear selection in step S13, the measurement noise which is the reference
audio signal is output from the audio analyzer 5 (step S18), and the left or right channel speaker
is selected, and measurement is performed from the selected speaker A sound due to noise is
output (step S19). The sound due to the measurement noise is input to the audio analyzer 5
through the microphone 8 and analyzed (step S20). The average level value of the rear left and
right channels of the analysis result is displayed on the display unit 73 (step S21). A display
example in this case is shown in FIG.
[0031] In step S12, in the case of selecting the display of the average level value on the front side
and the rear side, the measurement noise which is the reference audio signal is output from the
audio analyzer 5 (step S22), and the front side speaker or rear side speaker Is selected, and a
sound due to the measurement noise is output from the selected speaker (step S23). The sound
due to the measurement noise is input to the audio analyzer 5 through the microphone 8 and
analyzed (step S24). The average level value on the front side and the rear side of the analysis
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result is displayed on the display unit 73 (step S25). A display example in this case is shown in
FIG.
[0032] Next, it is judged whether or not the data as a result of the display is stored according to
the operation command (step S26), and in the case of storage, the result data is stored in the
floppy disk (or hard disk) of the data storage unit 75. (Step S27). Further, whether or not printing
is to be performed is determined by an operation command (step S28), and in the case of
printing, a result display is output to the printer of the printing unit 74 (step S29). After that, the
processes from step S2 to step S29 are executed according to a predetermined operation
command until the end operation is performed (step S30).
[0033] As described above, according to the present embodiment, the measurement noise as the
reference signal is supplied to each of the selected speakers, and the sound obtained from the
selected speaker is analyzed. Independent frequency characteristics and average level values
over the entire frequency band can be displayed. Moreover, since the result can be displayed in
real time while changing the setting data of the DSP unit 2, the setting data can be determined
quickly.
[0041] As is apparent from the above embodiment, the present invention selects either the left
channel speaker or the right channel speaker and applies the reference audio signal to the
selected speaker through the acoustic correction means and the power amplifier. The sound
correction is performed by supplying and analyzing the sound generated from the left channel
speaker or the right channel speaker independently according to the reference audio signal and
simultaneously displaying the frequency characteristics of the left channel audio signal and the
right channel audio signal. It is possible to grasp frequency characteristics of audio signals of the
left channel and the right channel which are independently subjected to acoustic correction by
means.
[0035] Further, the average level value of the entire frequency band of the left channel audio
signal and the right channel audio signal can be displayed to grasp the characteristics thereof.
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