JPH10262298A - Sound quality processing circuit and karaoke equipment using the circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sound quality processing circuit capable of creating a sound having reality. SOLUTION: A difference signal between a left signal and a right signal is obtained from a stereophonic signal of a music reproduction signal by a subtractor 44. The difference signal is properly delayed by a delay means 60, further attenuated properly by attenuators 48a, 48b, 48c, 48d, the attenuated signals are selected by switches 46b, 46c and the selected signal is mixed with the original left signal and the original right signal through buffer amplifiers 40c, 40h. The mixed signal is provided to differential amplifiers 52a, 52b. Resonance circuits 54a, 54b, 54e, 54f having a resonance frequency at a high frequency band and resonance circuits 54c, 54d, 54g, 54h having a resonance frequency at a low frequency band are connected selectively to the differential amplifiers 52a, 52b with switches 46e, 46f, 46g, 46h to reinforce high and low sound ranges.

Description

DETAILED DESCRIPTION OF THE INVENTION

[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 full of presence. The present invention also relates to a karaoke apparatus using the sound quality processing circuit.

[0002]

2. Description of the Related Art A left signal and a right signal of a stereo signal include a signal component from a central portion in the same phase and signal components such as reverberation sound in an opposite phase. Therefore, by obtaining a difference signal between the left signal and the right signal, a signal in which the signal component from the center is canceled out and the signal component such as a reverberant sound becomes relatively large is obtained. Then, when this difference signal is mixed with the left signal and the right signal, a signal in which the reverberation sound is further emphasized is obtained. In addition, by obtaining the sum signal of the left signal and the right signal, a signal in which the signal component from the center is relatively large and the 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 center, that is, the singing voice and the like is emphasized is obtained.

An equalizer circuit for amplifying or attenuating sound for each frequency band is conventionally known as a sound quality processing circuit. In particular, by emphasizing the bass, a powerful sound quality that affects the belly can be obtained.

[0004]

In a conventional sound quality processing circuit having the above-described structure for processing a signal by a difference signal or a sum signal between a left signal and a right signal of a stereo signal,
Not enough realism is necessarily obtained. Also, the size of the music hall to be played is poor. Here, the sense of presence refers to a sense as if the listener were present in the performance hall.

Further, in the conventional circuit in which sound is amplified or attenuated for each frequency band, a powerful sound is obtained but lacks a sense of reality.

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 realism and power. It is another object of the present invention to provide a karaoke apparatus having the sound quality processing circuit provided in the karaoke apparatus and having an excellent sense of realism.

[0007]

To achieve the above object, a sound quality processing circuit according to the present invention comprises a difference signal means for obtaining a difference signal between a left signal and a right signal of a stereo signal, and a delay for delaying the difference signal. Means, attenuating means for attenuating the delayed signal, mixing means for mixing the attenuated signal with the left and right signals, and emphasis means for reinforcing the treble and bass of the mixed signal. And is provided.

Further, sum signal means for obtaining a sum signal of a left signal and a right signal of a stereo signal, delay means for delaying the sum signal, attenuating means for attenuating the delayed signal, and attenuated signal To the left signal and the right signal, and emphasis means for reinforcing the treble and bass of the mixed signal.

The sound quality processing circuit may be configured so that the delay amount of the delay means can be adjusted.

A karaoke apparatus according to the present invention is configured so that a music reproduction signal is processed by a sound quality processing circuit according to claim 1 or 2, and the processed signal and a microphone input signal are mixed by mixing means.

The sound quality processing circuit is provided with amplifying means for amplifying and outputting the signal subjected to the sound quality processing, and the amplifying means is provided with gain switching means or attenuation amount switching means. When the sound quality processing circuit operates, the gain switching is performed. The magnitude of the signal subjected to the sound quality processing may be controlled by means or an attenuation amount switching means so as to be relatively small with respect to the microphone input.

Further, the music reproduction signal and the microphone input signal may be mixed by mixing means, and the mixed signal may be processed by the sound processing circuit according to the first or second aspect.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a block diagram showing a sound quality processing circuit according to an embodiment of the present invention. FIG. 2 shows FIG.
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 the gain switching means in the buffer amplifier of FIG. FIG.
FIG. 4 is a circuit diagram showing an example of an attenuation amount switching unit in the buffer amplifier of FIG. FIG. 5 shows that when the sound quality processing circuit is operated, the magnitude of the signal subjected to the sound quality processing is controlled to be relatively small so that the microphone input signal such as singing voice is not masked by the music reproduction signal. FIG.

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 reproducing device 10 is amplified by the music amplifier 12 and further supplied to the sound quality processing circuit 14 to be appropriately processed as described later. The signal subjected to the sound quality processing is supplied to the key control unit 16, the pitch of the signal is adjusted as appropriate, the size of the signal is adjusted by the music volume 18, and the signal is supplied to the mixing circuit 20 as mixing means. Also,
The microphone input signal output from the microphone 22 to which the singing voice is given is amplified by the microphone amplifier 24 and further given to the microphone echo unit 26, where the echo processing is appropriately performed, and the size thereof is appropriately adjusted by the microphone volume 28. It is provided to the mixing circuit 20. Further, the mixed signal mixed by the mixing circuit 20 is amplified by the amplifier 30 and is amplified by the speaker 32. The key control section 16, the music volume 18, the mixing circuit 20, the microphone echo section 26 and the microphone volume 28 constitute a so-called karaoke section 34.

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 supplied to a buffer amplifier 40a, and its output is supplied to a buffer amplifier 40b and an adder 42 as sum signal means and a subtractor 44 as difference signal means. The right signal of the stereo signal is applied to buffer amplifier 40f, and its output is applied to buffer amplifier 40g and adder 42 and subtractor 44. The output of the adder 42 and the output of the subtractor 44 are selected by the switch 46a, and the selected signal is given to the delay means 60 to be delayed.
Given to. The output of the buffer amplifier 40e is
a, 48b, 48c, and 48d, respectively. Then, the outputs of the attenuators 48a and 48b are selected by the switch 46b or neither of them is selected, and the signal is added to the output of the buffer amplifier 40b to be provided to the buffer amplifier 40c as the mixing means. Further, the attenuators 48c and 48d
Is selected by the switch 46c or neither of them is selected, and its signal is added to the output of the buffer amplifier 40g and supplied to the buffer amplifier 40h as the mixing means. The delay means 60 is supplied with a clock signal from the clock oscillator 50.
6d, the delay amount is appropriately selected and the amount of delay is selected.

The output of the buffer amplifier 40c is supplied to a plus input terminal of a differential amplifier 52a as an emphasizing means, and is connected to one end of a series connection of a resistor R1 and a variable resistor VR1, and a resistor R2 and a variable resistor VR2. Each given. 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 minus input terminal of the differential amplifier 52a. Also,
The output of the buffer amplifier 40h is supplied to a plus input terminal of a differential amplifier 52b as an emphasizing means, and is also supplied to one end of a series connection of a resistor R3 and a variable resistor VR3, and a resistor R4 and a variable resistor VR4. 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 a differential amplifier 52b.
Is connected to the negative input terminal of Furthermore, two high-frequency resonance circuits 54 having different resonance frequencies in the high frequency range.
a and 54b are connected to the sliding terminal of the variable resistor VR1 via the resistors R5 and R6, respectively, selected by the switch 46e or neither. Then, the two bass resonance circuits 54 having different resonance frequencies in the bass range.
The switches c and 54d are connected to the sliding terminal of the variable resistor VR2 via the resistors R7 and R8, respectively, selected by the switch 46f or neither. Further, two treble resonance circuits 54e having different resonance frequencies in the treble range,
54f is connected to the sliding terminal of the variable resistor VR3 via the resistors R9 and R10, respectively, selected by the switch 46g or neither. Then, two bass-range resonance circuits 54g having different resonance frequencies in the bass range,
54h is connected to the sliding terminal of the variable resistor VR4 via the resistors R11 and R12, respectively, selected by the switch 46h or neither. Differential amplifier 52a
Is output as a left signal that has been amplified by the buffer amplifier 40d as amplifying means and subjected to sound quality processing. The buffer amplifier 40d is provided with a switch 46i for switching a gain or an amount of attenuation. The output of the differential amplifier 52b is output as a right signal that has been amplified by the buffer amplifier 40i as an amplifying means and subjected to sound quality processing. The buffer amplifier 40i is provided with a switch 46j for switching a gain or an amount of attenuation.

An example of the gain switching means in the buffer amplifiers 40d and 40i will be described with reference to FIG. A signal is applied 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, these are appropriately selected by the switches 46i (46j) and connected to the minus input terminal, and the plus terminal of the operational amplifier OP is grounded. Therefore, by setting the values of R14, R15, and R16 differently and appropriately, the switch 46i (46
Amplified signals having different gains are output from the output terminals according to the selection of j). The resistors R15 and R15 selected by the switches 46i (46j) when the sound quality processing circuit 14 is in the operating state.
16 is set to reduce the gain. In addition,
In FIG. 3, the gain is switched at the position of the switch 46i (46j) in the operation state of the sound quality processing circuit 14. The gain of the operational amplifier OP is determined by the resistor R13 and the switch 46.
It is determined by the value of the resistor selected by i (46j).

An example of the attenuation 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. And
The other end of the resistor R17 is grounded via the switch 46i (46j) and the resistor R18. Therefore, the sound quality processing circuit 14
Is in the operating state, the other end of the resistor R17 is connected to the switch 46.
i (46j) is connected to the resistor R18, and the output signal is divided and attenuated by the resistors R17 and R18. In FIG. 4, the attenuation cannot be switched at the position of the switch 46i (46j) as shown in FIG. 3 in the operating state of the sound quality processing circuit 14.

Next, the operation of the above 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 between the left signal and the right signal is delayed by the delay means 60 and appropriately attenuated by the attenuators 48a, 48b, 48c, and 48d.
6b and 46c are mixed with the original left signal and right signal and supplied to the buffer amplifiers 40c and 40h. Here, the delay amount and the attenuation amount are determined by the switches 46d, 46b, 46c.
Is switched as appropriate. The buffer amplifiers 40c, 40
In the signal output from h, since the signal components such as reverberation are delayed and mixed, the size of the hall to be played is widely felt.

Further, the left signal and the right signal obtained by delaying and mixing the signal components such as reverberation are supplied to the differential amplifiers 52a and 52b. These differential amplifiers 52a and 52b can adjust the signal strength for each frequency band. In the present invention, since the purpose is to reinforce, the variable resistance V
The sliding terminals of R1, VR2, VR3 and VR4 are shown in FIG.
Moving to the side opposite to 1, R2, R3, R4 reinforces the signal, while moving to the R1, R2, R3, R4 side does not reinforce the signal and keeps the original signal. The frequency bands to be reinforced are the resonance circuits 54a, 54b, 54c, 54d, 5d selected by the switches 46e, 46f, 46g, 46h.
It is determined by the resonance frequencies of 4e, 54f, 54g and 54h. Therefore, two frequency bands can be selected in the high frequency range and two frequency bands can be selected in the low frequency range. Note that a resistor R5,
R6, R7, R8, R9, R10, R11, R12 limit the maximum amount of signal enhancement. The reinforcement of the treble and bass creates a powerful sound.

Next, the operation of the karaoke apparatus of the present invention will be described. The signal whose high range and low range are reinforced as described above is amplified by the buffer amplifiers 40d and 40i and output. By the way, the music playback signal after the sound quality processing
While the treble range and the bass range become larger as shown by the dashed line in FIG. 5, the microphone input signal has the middle range as shown by the broken line in FIG. Therefore, if the size of the middle tone range of the music reproduction signal is almost the same as that of the microphone input signal, the microphone input signal is masked by the music reproduction signal, and the singing voice tends to be difficult to hear. Therefore, when the sound quality processing circuit 14 is in the operating state, the magnitude of the amplified output of the music reproduction signal is slightly reduced as shown by the solid line in FIG. 5, and the midrange is relatively smaller than the microphone input signal. by doing,
Even if the signal is almost the same size in all frequency bands, the microphone signal in the midrange is not masked,
You can hear it clearly. Therefore, the singing voice is clear, and the sense of presence is created as if it was performed in a large hall or the like.

If the adder 42 is selected by the switch 46a, the signal component in the central portion is delayed and mixed to provide a thick sound quality. Therefore, the selection may be made according to the singer or listener's preference.

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, a sound quality processing circuit 14 is provided for a signal obtained by mixing a music reproduction signal and a microphone input signal in a karaoke unit 34,
Sound quality processing is also performed on the microphone input signal.

In the present invention, the sum signal of the adder 42 and the difference signal of the subtractor 44 are delayed and attenuated,
The circuit configuration for mixing the left signal and the right signal is not limited to the above embodiment. Further, the circuit configuration for reinforcing the treble range and the bass range is not limited to the above embodiment. Further, it goes without saying that the circuit configuration for reducing the magnitude of the music reproduction signal when the sound quality processing circuit 14 is in operation is not limited to the above embodiment. Then, switches 46b and 46c for selecting the amount of delay signal attenuation, and switches 46e, 46f and 46 for selecting frequencies for reinforcing the high frequency range and the low frequency range.
g and 46h may be linked with the left signal and the right signal, or may be adjusted independently. Also,
The variable resistors VR1, VR2, VR3, VR4 may be linked or independent. Furthermore, the sound quality processing circuit 14 is not limited to the one provided before or after the karaoke unit 34, but may be provided inside the karaoke unit 34, for example, after the key control unit 16.

[0026]

As described above, since the sound quality processing circuit of the present invention and the karaoke apparatus using the circuit are constituted, the following special effects can be obtained.

In the sound quality processing circuit according to the first aspect,
The signal components such as reverberation included in the stereo signal are delayed and mixed, and the treble and bass are reinforced, so that the sound is as if it were played in a large hall but full of presence and power. I can be creative.

In the sound quality processing circuit according to the second aspect,
The signal components such as the central singing voice included in the stereo signal are delayed and mixed, and the treble and bass parts are reinforced, creating a rich and powerful sound for the singing voice. .

In the sound processing circuit according to the third aspect,
By adjusting the amount of delay, it is possible to adjust the sense of the size of the hall being played.

In the karaoke apparatus according to the fourth aspect,
Since only the music reproduction signal is subjected to sound quality processing, and this signal is mixed with the microphone input signal and amplified, the feeling is created as if singing with a big band accompaniment in a large hall with a backing.

In the karaoke apparatus according to the fifth aspect,
Since the size of the music reproduction signal subjected to the sound quality processing is relatively reduced, the singing voice becomes clear without the microphone input signal being masked. Moreover, since the treble section and the bass section are reinforced, the power of sound is not lost.

In the karaoke apparatus according to the sixth aspect,
5. A thick singing voice is obtained because not only a music reproduction signal but also a microphone input signal is subjected to sound quality processing and loudspeaked.
A sense of realism and power different from the described karaoke apparatus can be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram of a sound quality processing circuit according to an embodiment 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 a gain switching means in the buffer amplifier of FIG.

FIG. 4 is a circuit diagram illustrating an example of an attenuation amount switching unit in the buffer amplifier of FIG. 1;

FIG. 5 shows that when a sound quality processing circuit is operated, the magnitude of a signal subjected to sound quality processing is controlled to be relatively small so that a microphone input signal such as a singing voice is not masked by a music reproduction signal. FIG.

FIG. 6 is a block circuit diagram showing a configuration of another embodiment of a karaoke apparatus using the sound quality processing circuit of the present invention.

[Explanation of symbols]

 Reference Signs List 10 music reproducing device 12 music amplifier 14 sound quality processing circuit 22 microphone 24 microphone amplifier 30 amplifier 32 speaker 34 karaoke unit 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 R VR variable resistance

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI H04R 3/00 H04R 3/04 3/04 G10K 15/00 B (72) Inventor Masaharu Kamo 3-chome Kitahorie, Nishi-ku, Osaka-shi, Osaka No. 12 Nikko Donai Co., Ltd. (72) Inventor Yoshihiko Takizawa 3-1-1 Kitahorie, Nishi-ku, Osaka-shi, Osaka Nikko Donai Co., Ltd.

Claims (6)

[Claims] 1. A difference signal means for obtaining a difference signal between a left signal and a right signal of a stereo signal, a delay means for delaying the difference signal, an attenuation means for attenuating the delayed signal, and the attenuated signal. The sound quality processing circuit comprises: mixing means for mixing the sound signal into the left signal and the right signal; and emphasizing means for reinforcing the treble and bass of the mixed signal. 2. Sum signal means for obtaining a sum signal of a left signal and a right signal of a stereo signal, delay means for delaying the sum signal, attenuation means for attenuating the delayed signal, and this attenuated signal The sound quality processing circuit comprises: mixing means for mixing the sound signal into the left signal and the right signal; and emphasizing means for reinforcing the treble and bass of the mixed signal. 3. The sound quality processing circuit according to claim 1, wherein a delay amount of said delay means is adjustable. 4. A karaoke apparatus wherein a music reproduction signal is processed by the sound quality processing circuit according to claim 1 or 2, and the processed signal and a microphone input signal are mixed by mixing means. 5. The karaoke apparatus according to claim 4, wherein
The sound quality processing circuit is provided with amplifying means for amplifying and outputting a signal subjected to sound quality processing, and the amplifying means is provided with gain switching means or attenuation amount switching means. When the sound quality processing circuit operates, the gain switching means or attenuation amount switching means is provided. A karaoke apparatus characterized in that the size of the signal subjected to the sound quality processing is controlled by means so as to be relatively small with respect to the microphone input signal. 6. A karaoke apparatus characterized in that a music reproduction signal and a microphone input signal are mixed by mixing means, and the mixed signal is subjected to sound quality processing by the sound quality processing circuit according to claim 1 or 2.