JPH0326468B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pitch control device that automatically corrects the pitch deviation even if a user of a karaoke or the like sings out of pitch.

When enjoying karaoke, etc., people who are not good at singing may not be able to keep up with the accompaniment of the song, resulting in an out-of-tune voice, so they may give up singing in the middle of the song or start from the beginning. Many people lose their energy. Therefore, products such as key controllers are being marketed for these people, but these products transpose the tone of the accompaniment of the song (for example, from C major to F major) to create an accompaniment in a range that is easier for the singer to sing. It is possible to choose.

However, even if these products are used, tone-deaf people will still lose their pitch in the middle of a song, so they will not be helped.

The present invention has been made from the above-mentioned viewpoint, and it is possible to automatically match the singer's pitch with the accompaniment pitch by detecting the pitch deviation even when the singer is out of tune. The object of the present invention is to provide a pitch control device having the following configuration.

In order to achieve the above object, the pitch control device of the present invention includes an A/D conversion means for A/D converting an audio signal, a write clock pulse generation means for generating a clock pulse of a constant frequency, and a pitch reference signal that converts the frequency of the audio signal into a pitch reference signal. a read clock pulse generating means for generating a variable frequency clock pulse based on the output of the frequency comparing means, and a read clock pulse generating means for generating a variable frequency clock pulse based on the output of the A/D converting means; The present invention is characterized in that it comprises a memory means for reading data based on the output of the read clock pulse generating means, and means for D/A converting the output of the memory means.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing a pitch control device according to an embodiment of the present invention, in which 1 is a pitch reference signal source, 2 is an audio signal source, 3 is a frequency comparator, 4 is a voltage controlled oscillator, and 5 is a readout clock pulse oscillator. , 6 is a write clock pulse oscillator, 7 is a read/write controller, 8 is an A/D converter, 9 is a memory element, 10 is a D/A converter, 11 is an amplifier, and 12 is an output terminal.

In the above configuration, the signal from the pitch signal source 2 consisting of the singer's voice is converted into, for example, PCM by the A/D converter 8 and is applied to the memory element 9.
Read from write clock pulse oscillator 6/
It is written by constant frequency clock pulses applied via write controller 7. on the other hand,
The audio signal is also applied to a frequency comparator 3 together with the signal from the pitch reference signal source 1 to compare the frequencies of both signals. Depending on the comparison result, the frequency comparator 3 outputs a variable voltage and applies it to the voltage controlled oscillator 4, and the voltage controlled oscillator 4 outputs a variable frequency signal corresponding to the variable voltage and applies it to the readout clock pulse oscillator 6. Therefore, the oscillator 5 outputs a variable frequency clock pulse.

At this time, the frequency of the audio signal is f _A , the frequency of the reference signal is f _S , and the frequency of the readout clock pulse is
If f _RC is the frequency of the write clock pulse, and f _{WC is} the frequency of the write clock pulse, the read clock pulse oscillator 6 is controlled so that f _RC satisfies the following relationship with respect to f _WC according to the comparison result of f _S and f A. .

(1) f _A = f _S → f _RC = f _WC (2) f _A > f _S → f _RC < f _WC (3) f _A < f _S → f _RC > f _WC Next, from the above read clock pulse oscillator 5 A variable frequency clock pulse is applied to the memory element 9 via the read/write controller 7, and the PCM audio signal written by the constant frequency clock pulse is read out by this clock pulse. Next, this audio signal is sent to D/A converter 1.
0, the signal is returned to the original audio signal (analog), and is amplified by the amplifier 11 and output from the terminal 12.

According to the above device, even if the pitch of the audio signal deviates from the pitch reference signal, this pitch deviation is detected as a frequency deviation, and the deviation is detected as a change in the frequency of the read clock pulse with respect to the write clock pulse of a constant frequency. detected,
Since the frequency of this read clock pulse is controlled to always match the frequency of the write clock pulse, an audio signal always matched to the frequency of the reference signal is obtained from the output terminal.

When the frequencies of the reference signal and the audio signal match in this way, it means that the pitches of each other's sounds match, and even if the pitch of the audio signal deviates from the pitch of the reference signal, this deviation is automatically corrected. That will happen. Therefore, even if the pitch of the singer deviates from the pitch of the accompaniment, it is possible to always obtain an audio output that matches the pitch of the accompaniment. As a result, those listening around do not notice that the singer is tone-deaf.

Furthermore, since the pitch of the singer's voice is pulled in by the audio signal output from the speaker, there is an advantage that even if the pitch of the singer is off, the pitch can be easily corrected.

FIG. 2 shows another embodiment of the present invention, in which a tape deck 13 is used as the pitch reference signal source 1,
By setting audio multiplex tapes and tapes compatible with scoring machines (Wonder Score tape, etc.) in this tape deck 13, the electronic tone signals output from these tapes, the audio signals of professional singers, etc. can be used as reference signals. It is. By adding these reference signals and the audio signal from the microphone 14 used as the audio signal source 2 to the main part of the device shown at 15, an audio signal that always matches the pitch of the reference signal is output. When added to the amplifier 11 together with the accompaniment signal from the tape deck 13, the speaker 16 reproduces the song with the pitch corrected.

FIG. 3 shows another embodiment of the present invention, in which the pitch reference signal 1 is a musical instrument 1 such as an electric tone.
7, the accompaniment signal from the musical instrument 17 is used as a reference signal, and is applied to the main section 15 of the apparatus along with the audio signal from the microphone 14. In this case as well, the speaker 16 reproduces a song whose pitch has been corrected, as in the above embodiment.

As is clear from the above description, according to the present invention, an audio signal is A/D converted and then written into a memory element using a clock pulse of a constant frequency, while the frequency of the audio signal is compared with that of a pitch reference signal. A variable frequency clock pulse is generated in accordance with this result, the A/D converted audio signal in the memory element is read out using the variable frequency clock pulse, and the audio signal is then D/A converted. Since the frequency of the signal is controlled so as to always match that of the pitch reference signal, even if the singer's voice deviates from the accompaniment, this deviation is automatically corrected.

[Brief explanation of the drawing]

1 to 3 are block diagrams showing embodiments of the present invention. 1...Pitch reference signal source, 2...Audio signal source, 3
...Frequency comparator, 4...Voltage controlled oscillator, 5
. . . Read clock pulse oscillator, 6 . . . Write clock pulse oscillator, 9 . . . Memory element.

Claims (1)

[Scope of Claims] 1. A/D conversion means for A/D converting an audio signal, write clock pulse generation means for generating a clock pulse of a constant frequency, and a frequency for comparing the frequency of the audio signal with the frequency of a pitch reference signal. Comparing means; Read clock pulse generating means for generating variable frequency clock pulses based on the output of the frequency comparing means; and Read clock pulse generating means for writing the output of the A/D converting means based on the output of the writing clock generating means; a memory means for reading based on the output of the memory means; a means for D/A converting the output of the memory means;
A pitch control device comprising: