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JP2000253486

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DESCRIPTION JP2000253486
[0001]
The present invention relates to a speaker system for reproducing an audio signal, wherein
characteristics of a secondary component in a desired speaker are measured in advance, and the
characteristics of the measured secondary component are added to the speaker system. The
present invention relates to a second-order distortion adding device capable of reproducing the
desired speaker individuality. 2. Description of the Related Art Although it is ideal that audio
amplifiers do not generate distortion, many people prefer amplifiers with many distortions such
as vacuum tube amplifiers because the sound quality becomes inorganic if no distortion occurs. .
Further, as a circuit for obtaining warm sound quality like a vacuum tube amplifier, for example,
as described in JP-A-5-127672, a circuit which applies distortion equivalent to that of a vacuum
tube amplifier by digital signal processing has been proposed.
【0003】
Further, as a method of intentionally distorting a waveform to obtain an acoustic effect as in a
karaoke apparatus etc., for example, a proposal such as Japanese Patent Laid-Open No. 5-6177
has been made, and digital signal processing is performed even with an audio signal of small
amplitude Makes it possible to add ideal distortion. However, these methods are intended to
improve the sound quality by adding desired harmonics (overtones) to the fundamental wave,
and thus added distortion in this way Even in the case of electrical processing such as an audio
amplifier, components other than harmonics such as intermodulation distortion are less likely to
occur. In addition, even in the case of simulating the timbre of an instrument, adding harmonics
is the main processing, and the occurrence of intermodulation distortion is small.
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1
【0005】
On the other hand, a speaker system that reproduces an audio signal is a system that performs
complex conversions such as electrical signals to mechanical vibration and acoustic radiation,
and is a system in which all frequency components are output simultaneously. Therefore, not
only harmonic distortion but also intermodulation distortion occurs in the speaker system.
【0006】
Now, in such a speaker system, when it is desired to reproduce a desired individuality of the
speaker, the conventional method of adding harmonics is insufficient because no intermodulation
distortion is added at all. That is, in order to reproduce the desired individuality of the speaker,
the process of adding the intermodulation distortion at the same time as the overtone becomes
an issue. SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the
second-order distortion adding apparatus according to the present invention is characterized in
that h2 (k1, k2) which is a coefficient of second-order response in a desired speaker measured in
advance. The input digital audio signal is subjected to the operation of Equation 1 using the first
storage means to be held and h2 (k1, k2) which is the coefficient of secondary response in the
desired speaker, and the secondary in the desired speaker It is characterized by comprising a
first Volterra filter for generating a component, and addition means for adding the input digital
audio signal and the secondary component outputted from the first Volterra filter.
【0008】
The second-order distortion adding device according to the present invention further comprises
means for generating a second-order component of a drive speaker driven by the output signal of
the adding means, and the output from the input digital audio signal and the first Volterra filter.
The second component of the drive speaker is subtracted from the signal obtained by adding the
second component with the second component. BEST MODE FOR CARRYING OUT THE
INVENTION A second-order distortion adding apparatus according to the present invention is an
apparatus for adding harmonic distortion and intermodulation distortion in order to reproduce a
desired individuality of a speaker. explain.
【0010】
A non-linear system is considered to be the sum of first-order to N-order systems, and can be
expanded into polynomials by Volterra series expansion. The components after the third order
are negligible and can be ignored. Here, the Volterra series when the expansion is interrupted up
to the second order is shown in Equation 2.
【0012】
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2
Moreover, FIG. 1 models this. Here, H [•] indicates the total system, H1 [•] indicates the primary
system, and H2 [•] indicates the process of the secondary system, and H [•], H1 [•], H2 [•]. ]
Correspond to 25, 26 and 27 in FIG. 1, respectively.
【0013】
Further, h1 (k1) is a first-order Volterra impulse response (hereinafter also referred to as VIR),
and represents a linear characteristic of the speaker. This is equivalent to a commonly used
impulse response. On the other hand, h2 (k1, k2) is a second-order Volterra impulse response,
which indicates a second-order characteristic of the speaker. Then, if h2 (k1, k2) can be
identified, it is possible to freely generate the secondary component of the speaker by
performing the process shown in Equation 1.
【0014】
That is, by preparing a Volterra filter having h2 (k1, k2), which is a second-order Volterra
impulse response in a desired speaker, as a filter coefficient, it becomes possible to add desired
intermodulation distortion of the speaker, and this speaker It is possible to reproduce the
individuality of
【0015】
Next, a second-order distortion adding apparatus according to a first embodiment of the present
invention will be described with reference to FIG. The audio signal input to the input terminal 1 is
first converted to a digital signal by the A / D converter 2. Then, the audio signal converted into
the digital signal is branched into two, one of which is inputted as it is to the adder 4 and the
other of which is branched is extracted by the first Volterra filter 3 with a second-order
component. The next component is added by the adder 4. The audio signal to which the
secondary component has been added is converted to an analog signal by the D / A converter 5
and amplified by the audio amplifier 6 and then reproduced by the speaker 7.
【0016】
Here, the filter coefficients of the first Volterra filter 3 store the secondary response of the
desired speaker, which has been measured in advance, in the first storage means 3a configured
of, for example, the ROM, and the first storage A desired speaker individuality can be reproduced
by using the filter coefficients held by the means 3a.
【0017】
In addition, secondary response coefficients of a plurality of different speakers are held in the
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first storage means 3a, and the viewer can switch these coefficients according to music genres
such as classical music, jazz music and rock music, for example. And, it may be possible to
reproduce the individuality of different speakers suitable for each music genre.
【0018】
Thus, in the first embodiment, the desired speaker individuality is reproduced by adding the
secondary component of the desired speaker to the A / D converted audio signal, and the speaker
7 is generated. No treatment has been performed on the secondary component. However, when
the secondary component generated by the speaker 7 can not be ignored, it is necessary to
remove the secondary component generated by the speaker 7 in advance.
【0019】
The second-order distortion adding apparatus according to the second embodiment of the
present invention removes in advance the secondary component generated by the speaker when
the secondary component generated by the speaker can not be ignored. By adding the secondary
component of the speaker, the desired individuality of the speaker can be more clearly
reproduced.
【0020】
FIG. 3 shows a second-order distortion adding apparatus according to a second embodiment of
the present invention. An audio signal input to an input terminal 11 is first converted to a digital
signal by an A / D converter 12. Then, the audio signal converted into the digital signal is
branched into two at a branch point N1, one of the branched is inputted to the delay means 21,
and the other branched is inputted to the second volterra filter 14.
【0021】
Further, the audio signal outputted from the delay means 21 is further branched into two at the
branch point N2, one of the branched is inputted as it is to the adder 16, and the other is
branched by the first volterra filter 13. The components are extracted, and the secondary
components are added by the adder 16. Here, in the delay amount of the audio signal in the
delay means 21, the arrival timing to the adder 16 of the audio signal passing through the path
P3 branched at the branch point N1 and the audio signal passing through the paths P1 and P2
matches. The amount of delay is set to
【0022】
Here, the second Volterra filter 14, the second storage unit 14a, the convolver 15, and the third
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storage unit 15a are provided for removing the secondary component of the speaker 19, and are
provided at the branch point N1. The branched audio signal first passes through the second
Volterra filter 14, and further passes through the convolver 15 and is output to the addition 16.
【0023】
The filter coefficients in the second Volterra filter 14 can store the secondary response of the
speaker 19 measured in advance in the second storage means 14a, and the filter held in the
second storage means 14a By using the coefficient, the second Volterra filter 14 outputs a signal
obtained by extracting only the secondary component of the speaker 19 from the audio signal
branched at the branch point N1.
【0024】
The filter coefficient of the convolver 15 can store the inverse characteristic of the primary
response of the speaker 19 measured in advance in the third storage unit 15a, and the filter held
in the third storage unit 15a By using the coefficient, the convolver 15 outputs a signal obtained
by giving the inverse characteristic of the primary component of the speaker 19 to the output of
the second Volterra filter 14.
【0025】
Then, the adder 16 adds the signal on the path P1 output from the delay means 21 and the
signal on the path P2 output from the first Volterra filter, and the signal on the path P3 output
from the convolver 15 from the added signal To remove the secondary component in the speaker
19 and obtain an audio signal to which the desired secondary component of the speaker is
added.
【0026】
Then, the output signal of the adder 16 is converted into an analog signal by the D / A converter
17, then amplified by the audio amplifier 18, and reproduced by the speaker 19. As described
above, in the second-order distortion adding apparatus according to the second embodiment of
the present invention, since the desired second-order component of the speaker is added after
removing the second-order component of the speaker, the desired speaker individuality is
obtained. Can be reproduced more clearly. According to the second aspect of the present
invention, intermodulation distortion is added by adding the secondary component of the desired
speaker measured in advance, and the desired speaker can be obtained even if it is an
inexpensive speaker. It becomes possible to reproduce individuality.
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【0028】
In the second-order distortion application device according to claim 2, since the secondary
component of the desired speaker is added after removing the secondary component of the drive
speaker, the personality of the desired speaker can be reproduced more clearly. It becomes
possible.
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