JPH0792985A - Audio device - Google Patents

Abstract

PURPOSE:To automatically adjust the level of voice signal from a microphone so as to coincide it with levels of voice signals from which vocal signal components are eliminated and which are composed of almost back music signal components. CONSTITUTION:Voice signals La', Ra' obtd. by removing vocal signal components from voice signals La, Ra from a player and composed of almost back music signal components are generated in a voice cancel circuit 3 and voice added signals Lc, Rc which are obtd. by adding microphone voice signal Ama amplified by an amplifier 11 to signals La', Ra' respectively are outputted. The detection level Vm of the microphone voice signal Ama and an in-phase signal component Aep of voice signals La, Ra, that is, the detection level Va of almost voice signal components are compared in a comparison circuit 14 and the gain of the amplifier 11 is controlled by the compared output signal. Thus, the level of the voice signal Ama is automatically adjusted so as to be almost equal to levels of vocal signal components of voice signals La, Ra and are matched with levels of voice signals La', Ra'.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an audio device suitable for application to a karaoke device with voice cancellation.

[0002]

2. Description of the Related Art FIG. 3 shows an example of a karaoke apparatus with voice cancel. In the figure, 1L, 1R
Are input terminals to which a left audio signal La and a right audio signal Ra are respectively output from a video disk player, a compact disk player, etc. (not shown).

The audio signals La and Ra supplied to the input terminals 1L and 1R are supplied to the voice cancel circuit 3 via the buffer amplifiers 2L and 2R, respectively. The voice cancel circuit 3 removes vocal signal components from the audio signals La and Ra.

FIG. 4 shows a specific configuration example of the voice cancel circuit 3. In the figure, audio signals La and Ra
Is supplied to the adders 31L and 31R and is also supplied to the in-phase signal detection circuit 32. The in-phase signal detection circuit 32 detects in-phase signal components of the audio signals La and Ra, that is, substantially vocal signal components. This in-phase signal detection circuit 32
The output in-phase signal component is phase-inverted by the phase inversion circuit 33 and then supplied to the adders 31L and 31R. The adder 31L removes the in-phase signal component from the left audio signal La and obtains the left audio signal La 'which is substantially a back music signal component. Similarly, in the adder 31R, the in-phase signal component is removed from the right audio signal Ra, and the right audio signal Ra 'substantially composed of the back music signal component is obtained.

Returning to FIG. 3, the voice signals La 'and Ra' output from the voice cancel circuit 3 are input to the input sides of the buffer amplifiers 5L and 5R via the resistors 4L and 4R constituting the resistance adding circuit, respectively. Supplied.

Reference numeral 6 is an input terminal to which an audio signal Amc output from a microphone (not shown) is supplied.
The audio signal Amc supplied to the input terminal 6 is amplified by the microphone amplifier 7 and then supplied to the volume adjusting volume 8. Then, the volume-adjusted audio signal Amc ′ obtained at the mover of the volume 8 is supplied to the input side of the buffer amplifiers 5L and 5R via the resistors 9L and 9R forming the resistance adding circuit.

As a result, a left audio signal Lb obtained by adding the output audio signal Amc 'of the volume 8 to the left audio signal La' which is substantially a back music signal component is obtained at the output terminal 10L derived from the buffer amplifier 5L. . In addition, the output terminal 10R derived from the buffer amplifier 5R
A right audio signal Rb is obtained by adding the output audio signal Amc 'of the volume 8 to the right audio signal Ra' which is substantially a back music signal component.

[0008]

As described above, in the example of FIG. 3, the voice signal whose volume is adjusted by the volume 8 into the voice signals La 'and Ra' which are substantially back music signal components with the vocal signal component removed. The audio signals Lb and Rb to which Amc 'is added are output, and the user moves the mover position of the volume 8 in accordance with the levels of the audio signals La' and Ra 'while considering his own voice volume. The level of the audio signal Amc 'needs to be adjusted individually, which is very troublesome.

Therefore, according to the present invention, the vocal signal component is removed, and the level of the audio signal from the microphone is automatically adjusted so as to match the level of the audio signal substantially composed of the back music signal component. is there.

[0010]

SUMMARY OF THE INVENTION An audio device according to the present invention comprises voice canceling means for removing a vocal signal component from an audio signal output from an audio signal generating source and outputting an audio signal substantially composed of a back music signal component. ,
A microphone amplifier that amplifies the audio signal output from the microphone, and an addition unit that adds the amplified audio signal output from the microphone amplifier to the audio signal that is output from the voice canceling unit and that is substantially composed of back music signal components, and outputs the added signal. A vocal signal extracting means for extracting a vocal signal component from the audio signal output from the audio signal generating source, and a first level detecting means for detecting the level of the vocal signal component extracted by the vocal signal extracting means, Second level detection means for detecting the level of the audio signal output from the microphone amplifier and level comparison means for comparing the detection levels of the first and second level detection means are provided. Then, the gain of the microphone amplifier is controlled by the output signal of the level comparing means so that the level of the audio signal output from the microphone amplifier becomes substantially equal to the level of the vocal signal component of the audio signal output from the audio signal generation source. To control.

[0011]

In the present invention, the level of the audio signal Ama output from the microphone amplifier 11 is controlled to be substantially equal to the level of the vocal signal components of the audio signals La and Ra output from the audio signal generating source. The vocal signal component is removed and the level of the audio signal Ama is automatically adjusted so as to match the levels of the audio signals La 'and Ra' which are substantially back music signal components.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. In FIG. 1, parts corresponding to those in FIG. 3 are designated by the same reference numerals, and detailed description thereof will be omitted.

In this example, the audio signal Amc supplied to the input terminal 6 is supplied to and amplified by the microphone amplifier 11 whose gain can be varied. The amplified audio signal Ama output from the microphone amplifier 11 is supplied to the input side of the buffer amplifiers 5L and 5R via the resistors 9L and 9R.

As a result, a left audio signal Lc obtained by adding the output audio signal Ama of the microphone amplifier 11 to the left audio signal La 'which is substantially a back music signal component is obtained at the output terminal 10L derived from the buffer amplifier 5L. .
In addition, the output terminal 10 derived from the buffer amplifier 5R
In R, a right audio signal Rc obtained by adding the output audio signal Ama of the microphone amplifier 11 to the right audio signal Ra 'which is substantially a back music signal component is obtained.

The audio signal Ama output from the microphone amplifier 11 is supplied to the level detection circuit 12. A detection signal Vm corresponding to the level of the audio signal Ama is obtained from the level detection circuit 12, and the detection signal Vm is supplied to the negative input terminal of the level comparison circuit 14 via the buffer amplifier 13.

Further, the audio signals La and Ra supplied to the input terminals 1L and 1R are supplied to an in-phase signal detection circuit 15 as a vocal signal extracting means. The in-phase signal detection circuit 15 extracts the in-phase signal component of the audio signals La and Ra, that is, the substantially vocal signal component. The in-phase signal component Aep output from the in-phase signal detection circuit 15 is supplied to the level detection circuit 17 after the band pass filter 16 removes frequency components other than the vocal signal component.

The pass band of the band pass filter 16 is, for example, 200 Hz to 4 kHz. Level detection circuit 1
7, the in-phase signal component Aep, and hence the audio signals La and Ra
Detection signal Va corresponding to the level of the vocal signal component of
And the detection signal Va is supplied to the positive input terminal of the level comparison circuit 14. The output signal of the level comparison circuit 14 is supplied to the microphone amplifier 11 as a gain control signal.

Here, when the detection signal Vm is larger than the detection signal Va, the output signal level of the level comparison circuit 14 is lowered and the gain of the microphone amplifier 11 is lowered. Conversely, when the detection signal Vm is smaller than the detection signal Va, the output signal level of the level comparison circuit 14 rises and the gain of the microphone amplifier 11 is raised.

Therefore, in this example, the level of the audio signal Ama output from the microphone amplifier 11 is automatically adjusted to be substantially equal to the levels of the vocal signal components of the audio signals La and Ra. That is, since the level of the audio signal Ama is automatically adjusted so as to match the levels of the audio signals La 'and Ra' which are substantially back music signal components, the user has to bother individually to adjust the volume. Can be avoided.

FIG. 2 shows a specific configuration example of this example.
In FIG. 2, parts corresponding to those in FIG. 1 are designated by the same reference numerals.

In the figure, the output signal of the level comparison circuit 14 is np for controlling the gain of the microphone amplifier 11.
It is supplied to the base of the n-type transistor 111 via a resistor. In this case, when the detection signal Vm is larger than the detection signal Va, the output signal level of the level comparison circuit 14 decreases, so that the impedance of the transistor 111 increases and the gain of the microphone amplifier 11 decreases. vice versa,
When the detection signal Vm is smaller than the detection signal Va, the output signal level of the level comparison circuit 14 increases, so that the impedance of the transistor 111 decreases and the gain of the microphone amplifier 11 increases.

In the embodiment described above, the common-mode signal detection circuit 15 as the vocal signal extraction means is separately provided, but when the voice cancel circuit 3 is configured as shown in FIG. It is needless to say that the common-mode signal detection circuit 32 forming the voice cancel circuit 3 can also be used as the common-mode signal.

[0023]

According to the present invention, the level of the audio signal output from the microphone amplifier is controlled so as to be substantially equal to the level of the vocal signal component of the audio signal output from the audio signal generating source. , The vocal signal component is removed and the level of the audio signal output from the microphone is automatically adjusted to match the level of the audio signal consisting of the back music signal component. There is an effect that the troublesomeness of the adjustment can be avoided.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of an audio device according to the present invention.

FIG. 2 is a diagram showing a specific configuration example of an embodiment.

FIG. 3 is a configuration diagram showing an example of a conventional karaoke device with voice cancellation.

FIG. 4 is a diagram illustrating a configuration example of a voice cancel circuit.

[Explanation of reference symbols] 1L, 1R, 6 input terminals 2L, 2R, 5L, 5R, 13 buffer amplifier 3 voice cancel circuit 4L, 4R, 9L, 9R resistors constituting an adder circuit 10L, 10R output terminal 11 microphone amplifier 12 , 17 level detection circuit 14 level comparison circuit 15 in-phase signal detection circuit 16 band pass filter

Claims (1)

[Claims] 1. A voice canceling means for removing a vocal signal component from an audio signal output from an audio signal generating source to output an audio signal substantially composed of a back music signal component, and a microphone for amplifying an audio signal output from a microphone. An amplifier, an adding means for adding the amplified audio signal output from the microphone amplifier to an audio signal composed of a substantially back music signal component output from the voice canceling means, and outputting the result, and an output from the audio signal generating source. Vocal signal extracting means for extracting a vocal signal component from the voice signal, first level detecting means for detecting the level of the vocal signal component extracted by the vocal signal extracting means, and voice output from the microphone amplifier. Second level detecting means for detecting the level of the signal, and the first and the above Level comparison means for comparing the detection levels of the second level detection means, the gain of the microphone amplifier is controlled by the output signal of the level comparison means, and the level of the audio signal output from the microphone amplifier is the audio level. An acoustic device characterized in that it is controlled to be substantially equal to the level of a vocal signal component of an audio signal output from a signal generation source.