JPH06113389

Patent Translate
Powered by EPO and Google
Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPH06113389
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
sound quality adjustment apparatus capable of adjusting sound quality by changing transient
response characteristics in sound reproduction.
[0002]
2. Description of the Related Art In recent years, with the progress of high-quality sound
reproduction of sound reproducing devices, subtle differences in sound quality have become a
problem. Accordingly, in addition to the conventional steady-state physical characteristic
analysis, a transient analysis method has been emphasized, and at the same time, a sound quality
adjustment device capable of varying various sound quality has been desired.
[0003]
Hereinafter, a conventional tone control device will be described with reference to the drawings.
FIG. 2 shows the configuration of a conventional sound quality adjustment apparatus. In FIG. 2, 1
is an audio signal input means, 13 is a sound quality adjustment filter, 6 is an amplifier, and 7 is
a speaker. The signal inputted to the audio signal input means 1 changes the sound pressure
frequency characteristic in the steady state by the sound quality adjustment filter 13, is voltage
amplified by the amplifier 6, and is reproduced by the speaker 7. As the sound quality
08-05-2019
1
adjustment filter 13, a band amplification, band attenuation, high band emphasis, high band
attenuation, low band emphasis, low band attenuation, low band pass, high band type filter is
used. As described above, conventionally, it has been realized that the reproduction sound quality
is adjusted by freely changing the sound pressure frequency characteristics in the steady state.
[0004]
However, in the above configuration, although the sound quality can be adjusted to a certain
degree, it is not possible to adjust the sound quality caused only by the transient characteristic.
[0005]
SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a
sound quality adjustment apparatus capable of adjusting the sound quality caused only by
transient attenuation characteristics by adding an input signal and a minute signal obtained by
performing signal processing on an input signal and performing band pass. is there.
[0006]
SUMMARY OF THE INVENTION In order to solve this object, the sound quality adjusting
apparatus of the present invention comprises an input means for inputting an audio signal and a
characteristic input for inputting each data for realizing a desired characteristic desired. Means,
coefficient calculation means for calculating filter coefficients for realizing the characteristics
input by the characteristic input means by signal processing, and the coefficient calculation
means for the audio signal input to the input means A signal processing means for performing
signal processing using the coefficients, and an adder for adding the audio signal inputted by the
input means and the output signal of the signal processing means are constituted.
[0007]
At this time, the signal processing can be realized using a band pass filter or an IIR filter.
[0008]
According to the present invention, the sound quality due to the transient attenuation
characteristics can be freely adjusted by subjecting the input signal to signal processing and
adding the band-passed signal and the input signal.
[0009]
08-05-2019
2
Embodiments of the present invention will be described hereinbelow with reference to the
drawings.
FIG. 1 is a block diagram showing a sound quality adjustment apparatus according to an
embodiment of the present invention.
[0010]
In FIG. 1, 1 is input means, 2 is characteristic input means, 3 is coefficient operation means, 4 is
signal processing means, 5 is an adder, 6 is an amplifier, and 7 is a speaker system.
[0011]
First, in the characteristic input means 2, values such as the number of band pass filters, the
center frequency of the pass band, the level, and the Q (sharpness) are input so as to obtain
predetermined filter characteristics.
Based on the values input by the characteristic input unit 2, coefficients for signal processing for
realizing a predetermined filter characteristic are calculated by the coefficient operation unit 3.
Then, the audio signal input by the input means 1 is subjected to signal processing by the signal
processing means 4 using the coefficients calculated by the coefficient calculation means 3 based
on the respective input values.
In this signal processing means 4, signal processing is performed by a band pass filter that
passes only a predetermined band signal.
The filtered signal output from the signal processing means 4 is added to the input audio signal
in the adder 5, and the added signal is reproduced from the speaker system 7 through the
amplifier 6.
[0012]
08-05-2019
3
FIG. 2 shows an example of a configuration in which the signal processing means 4 is realized by
an IIR type filter, and this filter is connected in a multi-stage series.
In FIG. 2, 8 is a multiplier, 9 is an adder, and 10 is a delay. The coefficient calculating means 3
calculates the coefficient of the multiplier 8 shown in FIG. 2 in accordance with each of the
characteristic data inputted by the characteristic input means 2, and the desired characteristic is
obtained by the multiplier 8, the delay 10 and the adder 9. Generate a signal of This signal is
added to the audio signal input from the input means 1 by the adder 5 and reproduced by the
speaker 7 through the amplifier 6.
[0013]
FIG. 3 is an example of the sound pressure frequency characteristic realized by the signal
processing means 4. 11 is a characteristic for outputting an input audio signal one to one without
changing the characteristic. 12 is a characteristic for adjusting the sound quality caused by the
transient response characteristic. As described above, since the characteristic 12 has a level that
is 10 dB or more smaller at the peak than the input audio signal, the sound quality in the steady
state is hardly affected. However, since the Q of the band pass filter constituting the signal
processing means is large, the attenuation time of the band component becomes long, and the
sound quality due to the transient attenuation characteristic is changed by the influence. As
described above, the sound quality due to the transient attenuation characteristic can be
variously changed by changing the center frequency, the level, the Q, the number of filters, etc. of
the band pass filter according to the desired signal characteristics.
[0014]
As described above, according to the present invention, a band pass type filter having a small
gain and a large Q is realized by signal processing means, and a signal subjected to the signal
processing is added to an input signal. The sound quality due to only the transient attenuation
characteristics can be freely adjusted.
08-05-2019
4