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JPH10262298

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complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPH10262298
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
sound quality processing circuit for creating a powerful sound with a sense of presence. The
present invention also relates to a karaoke apparatus using this sound quality processing circuit.
[0002]
2. Description of the Related Art The left and right signals of a stereo signal contain signal
components from the central part in phase and also contain signal components such as
reverberation in antiphase. Therefore, by obtaining the difference signal between the left signal
and the right signal, it is possible to obtain a signal in which the signal component from the
central part is canceled and the signal component such as reverberation is relatively large. Then,
when this difference signal is mixed with the left signal and the right signal, a signal in which
reverberation is more emphasized can be obtained. Further, by obtaining a sum signal of the left
signal and the right signal, a signal component from the central portion becomes relatively large,
and a signal in which a signal component such as reverberation is canceled can be obtained.
Then, when this sum signal is mixed with the left signal and the right signal, a signal in which the
signal component from the central portion, that is, singing voice etc. is emphasized is obtained.
[0003]
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Also, an equalizer circuit that amplifies or attenuates sound for each frequency band is
conventionally known as a sound quality processing circuit. In particular, by emphasizing the
bass, it is possible to obtain a powerful sound that resonates with the belly.
[0004]
SUMMARY OF THE INVENTION In the conventional sound quality processing circuit having the
above-mentioned configuration for processing a signal by the difference signal or the sum signal
of the left signal and the right signal of a stereo signal, a sufficient sense of reality is necessarily
obtained. It is not done. In addition, the feeling of size of the music hall to be played is poor.
Here, the sense of presence means that the listener feels as though he or she is present at the
performance hall.
[0005]
Further, in the conventional circuit in which sounds are amplified or attenuated according to
frequency bands, the presence of a powerful sound is lacking.
[0006]
The present invention has been made in view of the circumstances of the prior art as described
above, and it is an object of the present invention to provide a sound quality processing circuit
capable of creating a sound excellent in presence and force.
Another object of the present invention is to provide this karaoke apparatus with this sound
quality processing circuit, and to provide a karaoke apparatus having an excellent sense of
reality.
[0007]
SUMMARY OF THE INVENTION In order to achieve the above object, the sound quality
processing circuit of the present invention comprises difference signal means for obtaining a
difference signal between left and right stereo signals, and a delay for delaying the difference
signal. Means, attenuating means for attenuating the delayed signal, mixing means for mixing the
attenuated signal into the left and right signals, and emphasizing means for reinforcing the high
and low portions of the mixed signal And are configured.
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[0008]
The sum signal means for obtaining a sum signal of the left signal and the right signal of the
stereo signal, a delay means for delaying the sum signal, an attenuation means for attenuating
the delayed signal, and the left signal The signal processing apparatus may be configured to
include mixing means for mixing into the signal and the right signal, and emphasizing means for
reinforcing the treble portion and the bass portion of the mixed signal.
[0009]
Then, the delay amount of the delay means of the sound quality processing circuit can be
adjusted.
[0010]
The karaoke apparatus of the present invention is configured to process the music reproduction
signal by the sound quality processing circuit according to claim 1 or 2, and to mix the processed
signal and the microphone input signal by the mixing means.
[0011]
Then, the sound quality processing circuit is provided with amplification means for amplifying
and outputting the sound quality processed signal, and the amplification means is provided with
gain switching means or attenuation amount switching means, and when the sound quality
processing circuit operates, the gain switching means or attenuation The magnitude of the signal
subjected to the sound quality processing may be controlled by the amount switching means so
as to be smaller relative to the microphone input.
[0012]
Furthermore, the music reproduction signal and the microphone input signal may be mixed by
the mixing means, and this mixed signal may be configured to be subjected to the sound quality
processing by the sound quality processing circuit according to claim 1 or 2.
[0013]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present
invention will be described below with reference to FIGS.
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FIG. 1 is a block circuit of one embodiment of the sound quality processing circuit of the present
invention.
FIG. 2 is a block circuit diagram of an example of a karaoke apparatus using the sound quality
processing circuit shown in FIG.
FIG. 3 is a circuit diagram showing an example of gain switching means in the buffer amplifier of
FIG.
FIG. 4 is a circuit diagram showing an example of attenuation amount switching means in the
buffer amplifier of FIG.
FIG. 5 shows that when the sound quality processing circuit is operated, the magnitude of the
sound quality processed signal is controlled to be relatively small so that a microphone input
signal such as singing voice is not masked by the music reproduction signal. It is a figure
explaining.
[0014]
First, the configuration of the karaoke apparatus of the present invention will be described with
reference to FIG.
The stereo signal output from the music reproduction apparatus 10 is amplified by the music
amplifier 12 and further supplied to the sound quality processing circuit 14 and appropriately
processed as described later. Then, the signal subjected to the sound quality processing is
supplied to the key control unit 16 to adjust the pitch appropriately, and the magnitude is
adjusted by the music volume 18 and supplied to the mixing circuit 20 as the mixing means.
Also, a microphone input signal output from the microphone 22 to which a singing voice is given
is amplified by the microphone amplifier 24 and is further given to the microphone echo unit 26
and echo processing is appropriately performed, and the size is appropriately adjusted by the
microphone volume 28. And supplied to the mixing circuit 20. Further, the mixed signal mixed by
the mixing circuit 20 is amplified by the amplifier 30 and is amplified from the speaker 32. A so-
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called karaoke unit 34 is configured by the key control unit 16, the music volume 18, the mixing
circuit 20, the microphone echo unit 26, and the microphone volume 28.
[0015]
Next, the configuration of the sound quality processing circuit 14 of the present invention will be
described with reference to FIG. The left signal of the stereo signal is applied to the buffer
amplifier 40a, and the output thereof is applied to the buffer amplifier 40b, the adder 42 as sum
signal means and the subtractor 44 as difference signal means. The right signal of the stereo
signal is applied to buffer amplifier 40f, and the output is applied to buffer amplifier 40g, adder
42 and subtractor 44. Then, the outputs of the adder 42 and the subtractor 44 are selected by
the switch 46a, the selected signal is applied to the delay means 60 and delayed, and the delayed
signal is applied to the buffer amplifier 40e. The outputs of buffer amplifier 40e are applied to
attenuators 48a, 48b, 48c and 48d, respectively. Then, the outputs of the attenuators 48a and
48b are selected by the switch 46b or neither selected, and the signal is added to the output of
the buffer amplifier 40b and supplied to the buffer amplifier 40c as mixing means. Also, the
outputs of the attenuators 48c, 48d are selected by the switch 46c or neither selected, and the
signal is added to the output of the buffer amplifier 40g and supplied to the buffer amplifier 40h
as mixing means. The clock signal is supplied from the clock oscillator 50 to the delay means 60,
and this clock signal is appropriately selected by the switch 46d to select the delay amount.
[0016]
The output of the buffer amplifier 40c is applied to the positive input terminal of the differential
amplifier 52a as an emphasizing means, and also applied to one end of a series connection of the
resistor R1 and the variable resistor VR1 and the resistor R2 and the variable resistor VR2. . The
other end of the series connection of the resistor R1 and the variable resistor VR1 and the
resistor R2 and the variable resistor VR2 is connected to the negative input terminal of the
differential amplifier 52a. The output of buffer amplifier 40h is applied to the positive input
terminal of differential amplifier 52b as an emphasizing means, and also applied to one end of a
series connection of resistance R3 and variable resistance VR3 and resistance R4 and variable
resistance VR4. Be The other end of the series connection of the resistor R3 and the variable
resistor VR3 and the resistor R3 and the variable resistor VR3 is connected to the negative input
terminal of the differential amplifier 52b. Furthermore, two high frequency range resonant
circuits 54a and 54b having different resonance frequencies in high frequency range are selected
by the switch 46e via the resistors R5 and R6 respectively, and neither is selected for the sliding
terminal of the variable resistor VR1. Connected Then, two bass resonance circuits 54c and 54d
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having different resonance frequencies in the bass range are selected by the switch 46f via the
resistors R7 and R8, respectively, or neither is selected and the sliding terminal of the variable
resistor VR2 is selected. Connected In addition, two high frequency range resonance circuits 54e
and 54f having different resonance frequencies in high frequency range are selected by the
switch 46g via the resistors R9 and R10, respectively, or neither is selected and the sliding
terminal of the variable resistance VR3 is Connected Then, two bass resonance circuits 54g and
54h having different resonance frequencies in the bass range are selected by the switch 46h via
the resistors R11 and R12 respectively, or neither is selected and the sliding terminal of the
variable resistor VR4 is selected. Connected The output of the differential amplifier 52a is
amplified by a buffer amplifier 40d as amplification means and output as a left signal subjected
to sound quality processing. The buffer amplifier 40d is provided with a switch 46i for switching
gain or attenuation. Further, the output of the differential amplifier 52b is amplified by a buffer
amplifier 40i as an amplifying means and output as a right signal subjected to sound quality
processing. The buffer amplifier 40i is provided with a switch 46j for switching gain or
attenuation.
[0017]
An example of the gain switching means in the buffer amplifiers 40d and 40i will be described
with reference to FIG. A signal is given to the negative input terminal of the operational amplifier
OP via the resistor R13. The output terminal of the operational amplifier OP is connected to the
resistors R14, R15 and R16, which are appropriately selected by the switch 46i (46j) and
connected to the negative input terminal, and the positive terminal of the operational amplifier
OP is grounded. Therefore, by setting the values of R14, R15, and R16 to be different and
appropriately set, amplified signals with different gains are output from the output terminal
according to the selection of the switch 46i (46j). The resistors R15 and R16 selected by the
switch 46i (46j) are set to reduce the gain when the sound quality processing circuit 14 is in
operation. In FIG. 3, the gain is switched at the position of the switch 46i (46j) in the operating
state of the sound quality processing circuit 14. The gain of the operational amplifier OP is
determined by the value of the resistor selected by the resistor R13 and the switch 46i (46j).
[0018]
An example of the attenuation amount switching means in the buffer amplifiers 40d and 40i will
be described with reference to FIG. One end of a resistor R17 is connected to the output terminal
of the operational amplifier OP, and a signal is output from the other end of the resistor R17. The
other end of the resistor R17 is grounded via the switch 46i (46j) and the resistor R18.
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Therefore, when the tone processing circuit 14 is in operation, the other end of the resistor R17
is connected to the resistor R18 by the switch 46i (46j), and the output signal is divided by the
resistors R17 and R18 and attenuated. In FIG. 4, the switching of the attenuation amount can not
be performed at the position of the switch 46i (46j) as shown in FIG. 3 in the operating state of
the sound quality processing circuit 14.
[0019]
Subsequently, the operation of the configuration will be described. First, the operation of the
sound quality processing circuit 14 will be described. It is assumed that the subtractor 44 is
selected by the switch 46a. Then, the difference signal of the left signal and the right signal is
delayed by the delay means 60 and appropriately attenuated by the attenuators 48a, 48b, 48c,
48d, and these attenuated signals are selected by the switches 46b, 46c, The left and right
signals are mixed and applied to buffer amplifiers 40c and 40h. Here, the delay amount and the
attenuation amount are appropriately switched by the switches 46d, 46b and 46c. The signals
output from the buffer amplifiers 40c and 40h are such that signal components such as
reverberation are delayed and mixed, so that the size and the like of a hole to be played can be
felt widely.
[0020]
Further, the left signal and the right signal obtained by delaying and mixing the signal
components such as the reverberation in this manner are applied to the differential amplifiers
52a and 52b. The differential amplifiers 52a and 52b can adjust the strength of the signal for
each frequency band. In the present invention, the purpose is to reinforce, so moving the sliding
terminals of the variable resistors VR1, VR2, VR3 and VR4 to the side opposite to R1, R2, R3 and
R4 in FIG. , R3 and R4 side, the signal is not reinforced and remains as the original signal. The
frequency band to be reinforced is determined by the resonant frequencies of the resonant
circuits 54a, 54b, 54c, 54d, 54e, 54f, 54g, 54h selected by the switches 46e, 46f, 46g, 46h.
Therefore, two frequency bands can be selected in the high range, and two frequency bands can
be selected in the low range. The maximum amount of signal reinforcement is limited by the
resistors R5, R6, R7, R8, R9, R10, R11 and R12. The reinforcement of the high range and low
range creates a powerful sound.
[0021]
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Next, the operation of the karaoke apparatus of the present invention will be described. The
signal in which the high range and the low range are reinforced as described above is amplified
by the buffer amplifiers 40d and 40i and output. By the way, the music reproduction signal
subjected to the sound quality processing has a large treble band and a bass band as shown by
an alternate long and short dash line in FIG. 5, while the microphone input signal has a large
midrange as shown by a broken line in FIG. . Therefore, if the magnitude of the middle range of
the music reproduction signal is comparable to the microphone input signal, the microphone
input signal tends to be masked by the music reproduction signal, making it difficult for the
singing voice to be heard. Therefore, when the sound quality processing circuit 14 is in
operation, the magnitude of the amplified output of the music reproduction signal is made
slightly smaller as shown by the solid line in FIG. 5, and the midrange is relatively smaller than
the microphone input signal. By doing this, even in the case of signals of substantially the same
size in all frequency bands, it is possible to clearly hear the microphone signal in the midrange
without being masked. Therefore, the singing voice is clear, and it is played in a wide hall and the
like, but a sense of reality is created.
[0022]
If the adder 42 is selected by the switch 46a, the signal component at the central portion is
delayed and mixed to obtain a thick sound quality. Therefore, it may be selected according to the
preference of the singer or the listener.
[0023]
FIG. 6 is a block circuit diagram showing the configuration of another embodiment of a karaoke
apparatus using the sound quality processing circuit of the present invention. In the karaoke
apparatus shown in FIG. 6, the sound quality processing circuit 14 is provided for the signal in
which the music reproduction signal and the microphone input signal are mixed in the karaoke
unit 34, and the sound quality processing is also performed for the microphone input signal. Is
done.
[0024]
In the present invention, the circuit configuration for delaying and attenuating the sum signal of
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the adder 42 and the difference signal of the subtractor 44 and mixing them with the left signal
and the right signal is not limited to the above embodiment. Also, the circuit configuration for
reinforcing the high range and the low range is not limited to the above embodiment.
Furthermore, the circuit configuration for reducing the size of the music reproduction signal in
the operating state of the sound quality processing circuit 14 is of course not limited to the
above embodiment. The switches 46b and 46c for selecting the attenuation of the delay signal
and the switches 46e, 46f, 46g and 46h for selecting the frequency for reinforcing the high
range and the low range are interlocked with the left signal and the right signal. Also, it may be
adjusted independently. Also, the variable resistors VR1, VR2, VR3 and VR4 may be interlocked
or independent. Furthermore, the sound quality processing circuit 14 is not limited to the one
provided at the front stage or the rear stage of the karaoke unit 34, but may be provided at the
rear stage of the key control unit 16 inside the karaoke unit 34, for example.
[0025]
As described above, since the sound quality processing circuit of the present invention and the
karaoke apparatus using the circuit are configured, the following special effects can be obtained.
[0026]
In the sound quality processing circuit according to claim 1, since the signal components such as
reverberation included in the stereo signal are delayed and mixed, and the treble part and the
bass part are reinforced, it is played as if it were a large hall. However, you can create sounds
that are full of realism and power.
[0027]
In the sound quality processing circuit according to claim 2, the signal components such as the
singing voice in the central portion included in the stereo signal are delayed and mixed, and the
treble portion and the bass portion are reinforced. You can create a sound that is full and
powerful.
[0028]
In the sound quality processing circuit according to claim 3, by adjusting the delay amount, it is
possible to adjust the sense of the size of the hole being played.
[0029]
In the karaoke apparatus according to claim 4, only the music reproduction signal is subjected to
the sound quality processing, and the microphone input signal is mixed with this signal and
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amplified, so that it is singing a big band accompaniment in the back in a wide hall Feeling is
created.
[0030]
In the karaoke apparatus according to claim 5, since the magnitude of the music reproduction
signal subjected to the sound quality processing is relatively reduced, the microphone input
signal is not masked and the singing voice is clear. Become.
Moreover, the treble and bass parts are reinforced, so that the power of the sound is not lost.
[0031]
In the karaoke apparatus according to claim 6, not only the music reproduction signal but also
the microphone input signal is subjected to sound quality processing and amplified, so that a
thick singing voice can be obtained, which is different from the karaoke apparatus according to
claim 4. Realism and power can be obtained.
[0032]
Brief description of the drawings
[0033]
1 is a block circuit of an embodiment of the sound quality processing circuit of the present
invention.
[0034]
2 is a block circuit diagram of an example of a karaoke apparatus using the sound quality
processing circuit shown in FIG.
[0035]
3 is a circuit diagram showing an example of the gain switching means in the buffer amplifier of
FIG.
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[0036]
4 is a circuit diagram showing an example of the attenuation amount switching means in the
buffer amplifier of FIG.
[0037]
Fig. 5 illustrates that when the sound quality processing circuit is operated, the magnitude of the
sound quality processed signal is controlled to be relatively small so that a microphone input
signal such as singing voice is not masked by the music reproduction signal. FIG.
[0038]
6 is a block circuit diagram showing the configuration of another embodiment of the karaoke
apparatus using the sound quality processing circuit of the present invention.
[0039]
Explanation of sign
[0040]
DESCRIPTION OF SYMBOLS 10 music reproduction apparatus 12 music amplifier 14 sound
quality processing circuit 22 microphone 24 microphone amplifier 30 amplifier 32 speaker 34
karaoke part 40 buffer amplifier 42 adder 44 subtractor 46 switch 48 attenuator 50 clock
oscillator 52 differential amplifier 54 resonance circuit 60 delay means R resistance RVR variable
resistance
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