JPS6350198A - Vocal signal removing device - Google Patents

Abstract

PURPOSE:To automatically select (L+R) signals and (L-R) signals by connecting a switching circuit to the output of a subtracter when there is a microphone input signal, and connecting the switching circuit to the output of an adder in other cases. CONSTITUTION:The input terminal 1 of left channel signals (L signals) and the input terminal 2 of right channel signals (R signals) are connected to an adder 3 and a subtracter 4. When there is no input signal in a microphone 8, a control circuit 5 connects a switch 6 to a contact (a), and accordingly, the output (L+R) signals of the adder 3 are outputted to an output terminal 7. When there are input signals in the microphone 8, the control circuit 5 connects the switch 6 to a contact (b), and accordingly, the output (L-R) signals of the subtracter 4, that is, signals from which vocal component is removed, are outputted to the output terminal 7. Thereby, (L+R) signals and (L-R) signals can be selected automatically.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a vocal signal that is configured to remove a vocal signal by calculating the difference between a left channel signal and a right channel signal of a stereo signal containing a vocal signal. This invention relates to a removal device.

BACKGROUND OF THE INVENTION In recent years, demand for vocal signal removal devices has gradually increased for the purpose of removing only the vocal component from a stereo signal containing vocal signals and singing along to music without vocals, commonly known as karaoke. It's coming.

An example of a conventional vocal signal removal device will be described below with reference to the drawings.

FIG. 2 is a block diagram of a conventional vocal signal removal device. In FIG. 2, 1 is an input terminal for a left channel signal (hereinafter referred to as "lower signal") in a stereo signal, 2 is an input terminal for a right channel signal (hereinafter referred to as "R signal"), and an adder 3 and a subtracter are respectively connected to the input terminal. Connected to 4.

The adder 3 receives the L signal and the R signal (hereinafter abbreviated as (L + R)), and the subtracter 4 receives the L signal - R signal [hereinafter (L-R)].
(abbreviated as )] are respectively subjected to analog calculations.

The output of the adder 3 is sent to the a terminal of the switch 6, and the output of the subtracter 4 is sent to the a terminal of the switch 6.
are connected to the b terminal of the switch 6, respectively. A common terminal C of the switch 6 is connected to an output terminal 7.

The operation of the vocal signal removing device configured as described above will be explained below with reference to FIG. 2.

First, when the switch 6 in Fig. 2 is connected to the a contact, the (L + R) signal calculated by the adder 3 is output to the output terminal, so the output signal is (L + R).
The signal is a monaural signal containing a vocal signal. Next, when the switch 6 in FIG. 2 is connected to the b contact, the (L-R) signal calculated by the subtracter 4 is output to the output terminal 7, so the output signal is (L-R) It becomes a signal. Normally, the vocal signal in a stereo signal is included in the L signal and R signal at the same level and phase, so by calculating (LR), the vocal signal components are canceled out and the vocal signal is removed. It is possible to obtain a music signal.

Problems to be Solved by the Invention However, in the above-described configuration, it is necessary to manually switch between the (L+R) signal and the (LR) signal when necessary. Therefore, this device can be used as a karaoke device, and in a duet song that includes both male and female vocals, for example, you can switch only the male vocal part to the (L-R) signal and mix your own song. If you want to switch to the (L+R) signal for the (L+R) signal and output the female vocal signal as is, for the male vocal part, set switch 6 to b and sing the song, and for the female vocal part, set switch 6 to a. There was a problem in that an extremely complicated operation had to be performed to switch to the song and stop the song.

In view of the above problems, the present invention automatically outputs the (L-R) signal when an input signal is input from the microphone, and automatically outputs the (L -1) signal when no input signal is input from the microphone. -R) signal, (L+R
) signal and (LR) signal can be automatically selected.

Means for Solving the Problems In order to solve the above problems, the vocal signal removal device of the present invention includes an adder and a subtracter for calculating the sum and difference of a left channel signal and a right channel signal. and a switch circuit for selecting one of the outputs of the subtracter, and connecting the switch circuit to the output of the subtracter when there is a microphone input signal, otherwise connecting the switch circuit to the output of the adder. It is equipped with a control circuit that controls the

Effect: With the above-described configuration, the present invention automatically outputs the (L-R) signal only when an input signal is input from the microphone, and when no input signal is input from the microphone.
By automatically outputting the (L+R) signal with C, (L
+R) signal and (LR) signal can be automatically selected.

Embodiment Hereinafter, a vocal signal removal device according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a vocal signal removal device in one embodiment of the present invention. In FIG. 1, the same reference numerals as in the description of the conventional example above indicate the same parts, and the description thereof will be omitted. A microphone 8 is connected to the control circuit 5.

This control circuit 5 determines the presence or absence of an input signal from the microphone 8, and controls the switch 6 so that if there is an input signal, the switch 6 is switched to contact a, and if there is no input signal, the switch 6 is switched to contact a. perform an action.

The operation of the vocal signal removing device configured as described above will be explained below with reference to FIG.

First, in FIG. 1, when there is no input signal to the microphone 8, the control circuit 5 connects switch 7 to contact a, so that the output (L + R) signal of the adder 3 is sent to the output terminal 7. Output. Next, when there is an input signal to the microphone 8, the control circuit 5 connects the switch e to the contact point, so that the output (L-R) signal of the subtracter 4, the signal from which the vocal component has been removed, is output to the output terminal. 7.

Effects of the Invention As described above, the present invention includes an adder and a subtracter that calculate the sum and difference between a left channel signal and a right channel signal, a switch circuit that selects the output of either the adder or the subtracter, and a discrimination circuit that controls the switch circuit to connect the switch circuit to the subtracter output when there is a microphone input signal, and otherwise connect the switch circuit to the adder output, and the microphone If there is an input signal from the microphone, it will automatically output the (L-R) signal, that is, a signal from which the vocal component has been removed, and if there is no input signal from the microphone, it will automatically output the (L-R) signal.
)-R) signal can be output.

As a result, when using this device as a karaoke device, in a duet song that includes both male and female vocals, for example, only the male vocal part, the (L-R) signal,
In other words, I switched to a signal with the vocal removed and mixed my own song, and the female vocal part was changed to (L-1-R).
) signal, if you want to output the female vocal signal as is, if you input your voice into the microphone in the male vocal part, the male vocal will be automatically removed, and if you do not input the singing in the female vocal part, it will be automatically removed. Typically, female vocals are output as is. In other words, it is possible to automatically create an effect that makes it seem as if the professional female vocalist and the user are performing a duet together, resulting in extremely great effects.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a vocal signal removing device according to an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional vocal signal removing device. 3...Adder, 4...Subtractor, 5...
...Control circuit, 6...Switch, 8...
...Microphone.

Claims (1)

[Claims] an adder and a subtracter that calculate the sum and difference between the left channel signal and the right channel signal; a switch circuit that selects the output of either the adder or the subtracter; and a switch circuit that selects the output of the adder or subtracter when there is a microphone input signal. A vocal signal removal device comprising: a control circuit connected to the subtracter output, and otherwise controlling the switch circuit to be connected to the adder output.