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DESCRIPTION JPH0686380

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DESCRIPTION JPH0686380
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
device for correcting frequency distortion due to the shape and size of a listening space, and in
particular, to measure and database signal distortion characteristics in each form of the listening
space in advance. Relates to a listening space characteristic correction device that can correct
distortion for each space.
[0002]
2. Description of the Related Art In general, in audio equipment, a power amplifier is used
because the audio sound reproduced and output from a CD (compact disc) or DAT (digital audio
tape) used for recording and reproduction of sound is weak. It is amplified so that the listener
can hear while passing through.
[0003]
The amplified sound is output as an actual audible sound while passing through the speaker
amplifier. At this time, the sound output from the speaker is distorted due to the acoustic
characteristics of the listening space where the listener is located, and the actual sound is Will
have differences.
Thus, the largest cause of distortion of the reproduced sound is the shape of the listening space
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and the sound reflectivity of the wall.
[0004]
Due to such a factor, there is a problem that the sound that the listener can actually hear is not
the original sound output from the CD or DAT, but the sound distorted due to the characteristics
of the listening space. In order to solve the problems as described above, conventionally, after the
test signal is output to the listening space and the characteristics of the listening space are
grasped by the signal that is returned, the frequency that is distorted due to the characteristics of
the listening space with respect to the reproduced and output signal The distortion of the sound
was corrected and given by correcting the characteristics.
[0005]
FIG. 1 is a block diagram of a conventional listening space characteristic correction apparatus for
correcting the frequency characteristic in this manner. According to FIG. 1, the conventional
listening space characteristic correction device generates a test signal for correcting the
distortion of the sound due to the source 10 for reproducing the sound recorded in the CD or
DAT and the characteristics such as the listening space. A test signal generation unit 20, a mixer
30 for placing a test signal generated from the test signal generation unit 20 on a transmission
path of an audio device for transmitting the sound output from the source 10; Since the equalizer
40 compensates for the frequency characteristics of the signal and the sound output from the
equalizer 40 is faint to be heard by the listener, the listener can amplify the reproduced sound so
that it can be heard Power amplifier 50, a speaker 60 for amplifying the sound amplified by the
power amplifier 50 into an audible sound, and an output from the speaker 60 A frequency
characteristic sensing unit 80 for extracting the frequency characteristic of the listening space
from the test signal input to the microphone 70 for receiving the test signal to be received again,
and an A / D converter for converting the frequency characteristic signal sensed from this into a
digital signal 90 and a control unit 100 for comparing the signal to be output from this and the
test signal to generate a correction signal of the listening space and then outputting it to the
equalizer 40 to correct the frequency distortion of the sound due to the listening space
Configured
[0006]
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In the listening space characteristic correction device configured as described above, when the
audio device operates, the control unit 100 instructs the test signal generation unit 20 to output
a test signal. The test signal generator 20 outputs a test signal according to an instruction from
the controller 100. At this time, a test signal to be used usually uses white noise or pink noise,
and in a special case, an impulse signal is used.
[0007]
The test signal output from the test signal generation unit 20 is output through the equalizer 40,
the power amplifier 50 and the speaker 60 via the mixer 30. The test signal output through the
speaker 60 is distorted due to the shape of the listening space and the sound reflectivity of the
wall. As described above, the test signal distorted in the listening space is input to the frequency
characteristic sensing unit 80 through the microphone 70 installed at a specific position (the
listening position of the user) in the listening space. The frequency characteristic sensing unit 80
extracts the frequency characteristic of the listening space from the input test signal.
[0008]
At this time, when the signal output from the test signal generation unit 20 is white noise or pink
noise, the frequency characteristic detection unit 80 checks the reduced frequency portion. If an
impulse signal is used, the input signal is subjected to FFT analysis or the like to extract the
frequency characteristic of the listening space. The A / D converter converts the frequency
characteristic signal extracted from the frequency characteristic sensing unit 80 into a digital
signal because it is an analog signal.
[0009]
The frequency characteristic signal converted to the digital signal by the A / D converter 90 is
input to the control unit 100. The control unit 100 compares the input frequency characteristic
signal with the original test signal output from the test signal generation unit 20 to extract the
transfer characteristic of the listening space. The control unit 100 calculates the correction
characteristic based on the transfer characteristic of the extracted listening space. The calculated
correction characteristic is output to the equalizer 40. The equalizer 40 corrects the audio sound
reproduced and input from the source 10 by the correction characteristic input from the control
unit 100 and outputs the corrected audio sound to the power amplifier 50.
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[0010]
The technique for correcting the frequency characteristic by the above-mentioned method is also
described in detail in "AUTOMATIC GRAPHIC BQUALIZER" of US Pat. No. 4,688,258. According
to the above patent, pink noise is generated to measure the frequency characteristic due to the
surrounding environment, the detected frequency characteristic is compensated, and the
frequency characteristic of the graphic equalizer is automatically controlled.
[0011]
However, the above techniques and the like require the microphone to be installed at a point
where the listener is located in order to receive a distorted signal due to the characteristics of the
listening space and the reflectivity of the wall surface. There is a problem of troublesomeness
and requiring another wire between the microphone and the audio device.
[0012]
Also, since the audio apparatus should have a frequency characteristic sensing unit, an A / D
converter, and a device for calculating the correction characteristic, there is a problem that the
price becomes high.
Therefore, the present invention can create a database of signal distortion characteristics of the
listening space with respect to the shape and size of the listening space, make it possible to
correct the distortion of the signal by user selection, and eliminate the troublesomeness and lines
due to the installation of microphones. An object of the present invention is to provide an
economical listening space characteristic correction device in which installation and
configuration of an audio device etc. are simplified by removing unnecessary equipment such as
a microphone.
[0013]
SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the
characteristic correction device for a listening space according to the present invention, devised,
comprises: a switch unit for inputting characteristic data of the listening space; Data for
correcting frequency characteristics, a database for storing programs for correcting frequency
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characteristics, a control unit for reading and outputting characteristic data and programs of the
corresponding listening space from the database by input of the switch unit, and the control unit
And a frequency characteristic correction unit that corrects a signal output from the audio device
according to the program according to the characteristic data from the control unit and outputs
the corrected signal to the power amplifier.
[0014]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention measures
correction characteristics in accordance with the shape and size of a listening space in advance
and stores them in a memory, and allows the user to make correction characteristics suitable for
the shape and size of the space where equipment is currently installed. Direct selection is made
so that distortion due to the listening space of the reproduced sound can be corrected.
[0015]
According to FIG. 2, the source 10 for reproducing the sound recorded on the recording medium
of the audio device such as CD or DAT, the switch unit 110 for the user to input the
characteristic data for the listening space, and the characteristic of the listening space Frequency
characteristic data and a database 120 for storing a program for compensating the frequency
characteristic, a control unit 130 for reading and outputting characteristic data and a program of
the corresponding listening space by the database 120 by input from the switch unit 110 The
display unit 140 visually displays the shape and size of the listening space input from the switch
unit 110, and the frequency generated from the listening space for the reproduction signal
output from the source 10 in response to the control signal from the control unit 130 The
frequency characteristic correction unit 150 that compensates for distortion and the frequency
characteristic correction from this point on A power amplifier 50 for amplifying the extent that
can hear the raw signal, and the amplified sound the power amplifier 50 from the speaker 60 for
amplifying the audible sound.
[0016]
Here, in the database 120, a frequency characteristic distorted due to the form and size of the
listening space is measured in advance, and a program for correcting this and a coefficient for
correcting the frequency are recorded in advance.
Therefore, when the user operates the switch unit 10 to input data regarding the form of the
listening space, the control unit 130 displays the form and the size of the listening space on the
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display unit 130 according to the input data.
[0017]
Also, the control unit 130 receives from the database 120 and outputs a program and a
coefficient for correcting the frequency characteristic by the listening space characteristic
corresponding to the corresponding input data.
The frequency characteristic correction unit 150 receives a program for correction and
coefficient data for frequency characteristic correction through the control unit 130, and corrects
the frequency distortion that should occur in the listening space for the reproduction signal
output from the source 10 Output.
[0018]
The power amplifier 50 amplifies and outputs the reproduction signal whose frequency
distortion has been corrected by the frequency characteristic correction unit 150.
The speaker 60 amplifies the reproduction signal amplified by the power amplifier 50 into an
audible sound and outputs it. According to FIG. 3, the switch unit 110 selects the form of the
listening space and the first switch 112 used at the time of mode change for correction of the
frequency characteristic or at the end of user's selection for the characteristic correction of the
frequency. It comprises a second switch 114 and a third switch 116 for setting the size of the
listening space.
[0019]
The database 120 comprises a program for performing frequency characteristic correction
according to the conditions of the listening space selected by the switch unit 110 and a ROM 122
in which a frequency characteristic correction signal (coefficient) is recorded. The display unit
140 outputs an LCD driving signal based on data on the shape and size of the listening space
input from the control unit 130, and the driving signal output from the LCD driving unit 142
generates audio data of the listening space. An LCD 144 visually displays the form and the size of
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the space.
[0020]
The frequency characteristic correction unit 150 converts the audio signal of the analog signal
reproduced from the source 10 into a digital signal, receives the program from the control unit
130 and coefficient data for frequency characteristic correction, and outputs the signal. And a D
/ A converter 156 for converting the digital signal processed by the digital signal processor 154
back into an analog signal.
[0021]
Therefore, when the user presses the first switch 112, the controller 130 senses this and
recognizes the mode for correcting the frequency characteristic of the listening space.
Thereafter, the form of the listening space inputted by the operation of the second switch 114 is
recognized, and the size of the listening space inputted by the operation of the third switch is
recognized.
[0022]
When the input to the size of the listening space by the operation of the third switch 116 is
ended, the first switch 112 is operated again so that the control unit 130 recognizes that the
input to the characteristic of the listening space is ended. . As described above, when information
on the listening space is input by the switch unit 110, the control unit 130 outputs data on the
form and size of the listening space to the LCD driver 142 of the display unit 140. The LCD
driver 142 outputs an LCD drive signal according to input data from the control unit 130.
[0023]
The LCD 144 illustrates the shape of the listening space by the output drive signal from the LCD
driver 142, and expresses the size of the listening space by the ratio of horizontal to vertical x: y.
At this time, the ratio is fixed at 1: 2, 2: 1, 1: 1 depending on the form of the listening space, and
then only horizontal data is input by the third switch 116, and the vertical size is automatically
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set. It is convenient if you
[0024]
That is, when the second switch 114 selects the listening space having the aspect ratio of 1: 2,
and the third switch 116 is set to 5 m in width, the longitudinal direction of the listening space is
equal to the width of the listening space. It can be conveniently used if it is automatically set to
10 m by the ratio to the length. On the other hand, when the shape and size of the listening
space are input by the user's operation of the switch unit 110 as described above, the control
unit 130 uses the database 120 to correct the corresponding frequency characteristic distortion
program and coefficients. Read and output to the frequency characteristic correction unit 150.
[0025]
At this time, in the database 120, a program for correcting the distorted frequency characteristic
according to the form and size of the listening space as described above and a coefficient for the
frequency correction are recorded in advance. Therefore, when the reproduction signal is input
from the source 10, the frequency characteristic correction unit 150 previously corrects and
outputs the frequency characteristic distorted in the listening space by the correction frequency
signal. Here, the A / D converter 152 converts the reproduction signal input from the source 10
into a digital signal. This is for the use of a digital filter as a DSP for frequency characteristic
correction.
[0026]
As described above, the reproduced signal converted into a digital signal is corrected in
frequency characteristic by the correction frequency signal (coefficient) input from the control
unit 130 by the DSP 154 configured by frequency characteristic correction means such as a
digital filter. The reproduction signal whose frequency characteristic has been corrected by the
DSP 154 is converted again into an analog signal by the D / A converter 156 and output.
[0027]
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The power amplifier 50 amplifies and outputs the reproduction signal whose frequency
characteristic has been corrected by the frequency characteristic correction unit 150. The
speaker 60 converts the amplified reproduction signal from the power amplifier 50 into an
audible sound that can be heard by the listener and outputs it. On the other hand, according to
FIG. 4, the ratio of width to height of the listening space 200 is x: y. At this time, it is preferable
to set the listening space to the horizontal to vertical ratio of the most ideal form at the time of
music appreciation, but it is also effective to set it at the horizontal to vertical ratio common to
current residences.
[0028]
However, in the present invention, for the sake of convenience, a listening space 200 in which
the horizontal-to-vertical ratio (x: y) is 1: 2 in (a), 2: 1 in (b), and 1: 1 in (c) is exemplified. As
mentioned. Therefore, in order to correct the frequency characteristic according to the shape and
size of the listening space as described above, a compensation frequency signal for correcting
distortion of the frequency characteristic should be stored in the database 120 in advance.
[0029]
For this purpose, the positions of the speakers 202 and 204 in the listening space of the abovementioned form are provided in advance on the left and right sides of the front, and the position
of the listener 206 is set. When the position of the listener is set, a microphone is installed at that
position to check in advance the frequency characteristics of the listening space. That is, the
distorted frequency characteristics that appear differently according to the shape and size of the
differently configured listening space are checked. The frequency characteristics checked by the
above method are stored in advance in the database 120 shown in FIG. 2 or 3 together with the
material for the listening space. Here, the material includes data for representing the form of the
listening space on the display unit 140 and a program for the operation of the control unit 130.
[0030]
According to FIG. 5, in the present invention, a digital filter is used for frequency correction. In
general, discrete systems are divided into recursive and non-recursive systems. A non-recursive
system is called an FIR system because the impulse response of the non-recursive system is a
finite-length sequence. Accordingly, there are also two types of digital filters: recursive and non-
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recursive. The former is called an IIR filter, and the latter is called an FIR filter.
[0031]
The IIR filter shown in FIG. 5 is excellent in that the load on the hardware such as memory and
coefficient multiplier can be reduced because the difference number N of the filters required to
satisfy the same filter error is very small, and many signal frequency ranges The bands are sorted
to adjust the amplification and reduction of the signal generated from each band respectively.
The FIR filter shown in FIG. 5 has the advantage of ensuring safety because it does not require a
feedback loop, and it is possible to satisfy the specifications of linear phase characteristics, so it is
widely used in applications such as waveform transmission. It has the effect of simultaneously
adjusting the typical frequency range.
[0032]
In (A) and (B) of FIG. 5 above, Z-1 is a delay element,
[0033]
【0034】はマルチフライアであり、
[0034]
Is an adder.
In the present invention, for signal processing in digital processing circuits, an IIR filter and an
FIR filter have been described by way of example, but any other filtering can be done.
The waveform shown to (A) in FIG. 6 is an example figure of the distortion frequency
characteristic beforehand measured in the specific listening space which the user set.
[0035]
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Therefore, in order to correct the distorted frequency characteristics as described above, the user
prestores in the database 120 a program for controlling the DSP 154 of the frequency
characteristic correction unit 150, coefficients, and data for representing the form of the
listening space on the display unit 140. Save it. In FIG. 6, the waveform of FIG. 6B is an example
showing the characteristic of the frequency for correcting the distorted frequency characteristic
in a specific listening space as shown in FIG. Therefore, when the user operates the switch 110
and selects a listening space having a distorted frequency characteristic as shown in (A), the
control unit 130 reads the program and coefficients stored in advance in the database to correct
the frequency characteristic. Output to the part 150.
[0036]
As a result, the frequency characteristic correction unit 150 generates a signal having a
frequency characteristic as shown in (B), and outputs a reproduced sound having a frequency
characteristic distorted due to the characteristics of the listening space as shown in (A). .
[0037]
As described above, the correction device according to the present invention creates a database
of signal distortion characteristics of the listening space with respect to the shape and size of the
listening space so that the distortion of the signal can be corrected by the user's selection. There
is also an economic effect that the troublesomeness and lines due to the installation can be
eliminated, and furthermore the installation and configuration of the audio equipment etc. can be
simplified by removing unnecessary equipment such as a microphone.
[0038]
In particular, although only the form and size of the listening space have been described above,
the object of the present invention can be achieved by creating a database also for the
reflectance of the material constituting the wall of the space, and Of course, various forms can
usually be provided.
Although more specific embodiments have been described above, it is clear that various
modifications can be made without departing from the scope of the invention.
[0039]
Brief description of the drawings
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[0040]
1 is a block diagram of a conventional listening space characteristic correction device.
[0041]
2 is a block diagram of a device applied to the embodiment of the listening space characteristic
correction device of the present invention.
[0042]
3 is a block diagram of one embodiment.
[0043]
4 is an exemplary view showing the space configuration and the position of the speaker.
[0044]
5 (A) and 5 (B) are circuit diagrams of the correction means in FIG. 2 or FIG.
[0045]
6 is a frequency characteristic diagram.
[0046]
Explanation of sign
[0047]
DESCRIPTION OF REFERENCE NUMERALS 10 source 50 power amplifier 60 speaker 110 switch
unit 112 first switch 114 second switch 116 third switch 120 database 122 ROM 130 control
unit 140 display unit 150 frequency characteristic correction unit
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