JPH10111694A - Device and method for multiplexing voice signal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To add a high degree and colorful effect to a voice signal by converting an input voice signal to a signal of a prescribed pitch, mixing the converted voice signal with the input voice signal, converting its output into the signal of the prescribed pitch and mixing the converted voice signal with the beforehand converted, mixed voice signal. SOLUTION: A circuit 20 is cascade connected to the circuit 30, and in the circuit 20, a level adjustment device 22-1 level adjusts the input voice signal, and further, after a pitch conversion device 21 pitch converts the input voice signal, the level adjustment device 22-2 level adjusts it, and a mixing device 23 adds the voice signals inputted from the level adjustment devices 22-1, 22-2 to output it. Further, in the circuit 30 also, the output of the circuit 20 of a first stage is processed similarly by the level adjustment device 32-1, the pitch conversion device 31, the level adjustment device 32-2 and the mixing device 33. That is, the first stage circuit 20 doubles the input voice signal to output it, and the second stage circuit 30 doubles further that voice signal to output the quadruple voice signal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an audio signal multiplexing apparatus and method, and more particularly, to a cascade connection of a plurality of pitch processing apparatuses for audio signals, and arbitrarily setting a value of a pitch conversion amount in each pitch processing apparatus. The present invention relates to an audio signal multiplexing apparatus and method capable of setting and adding advanced and various effects.

[0002]

2. Description of the Related Art Generally, a karaoke apparatus transmits a music performance signal to a CD (compact disc), a Video-CD (video compact disc), an LD (laser disc).
Or music synthesized by a sound source unit as represented by a communication karaoke, output as an accompaniment sound from a speaker, and sing the voice of the lyrics sung by the user in accordance with the output accompaniment sound. This is a device that collects sound with a microphone, superimposes it on an accompaniment sound signal, and outputs it from a speaker.

This karaoke apparatus incorporates a reverberation processing apparatus for adding an effect generally called an echo, and a pitch processing apparatus for adding an effect called a doubling, harmony, voice change, or the like. After performing reverberation processing and pitch processing on the output audio signal, it is superimposed on the music accompaniment signal and output.
It is designed to give a more realistic effect.

FIG. 4 is a block diagram showing a configuration example of a conventional karaoke apparatus. An audio signal output from the microphone 1 is input to a pitch processing device 2 and is converted into a signal having a predetermined pitch. The signal output from the pitch processing device 2 is supplied to the mixing device 7 directly or after reverberation (echo) is added by the reverberation processing device 3.

[0005] The stereo signal of the music accompaniment is output from the music reproducing device 4, and only the voice signal of the singer localized at the center is deleted by the voice canceller 5, then converted to a predetermined pitch by the pitch processing device 6 and mixed. It is supplied to the device 7.

[0006] The audio signal and the accompaniment signal are mixed in the mixing device 7, and then output to the left and right speakers 8-1 and 8-2.

Next, the operation will be described. The pitch processing device 2 converts the audio signal from the microphone 1 into a predetermined pitch, adjusts the pitch-converted signal and the input audio signal to an appropriate level, adds them, and supplies them to the reverberation processing device 3 and the mixing device 7. . The reverberation processing device 3 further adds a reverberation effect to the audio signal from the pitch processing device 2 and supplies it to the mixing device 7.

On the other hand, the voice canceller 5 removes only the singer's voice signal as an in-phase component contained in the left and right signals of the music accompaniment supplied from the music reproducing device 4 and supplies it to the pitch processing device 6. The pitch processing device 6 converts the pitch of the accompaniment signal supplied from the voice canceller 5 into a predetermined pitch supporting the user's operation, and adjusts the pitch-converted signal and the accompaniment signal from the voice canceller 5 to an appropriate level. , And are added to the mixture.

The mixing device 7 mixes the audio signal supplied from the pitch processing device 2 and the reverberation processing device 3 with the accompaniment signal supplied from the pitch processing device 6, and
-1 and 8-2.

FIG. 5 shows a basic configuration example of the pitch processing device 2. Although not shown, the pitch processing device 6 has the same configuration as the pitch processing device 2.

An input voice signal from the microphone 1 is input to a pitch conversion device 41, the pitch of which is shifted by a predetermined amount and converted into a signal of a predetermined pitch. The input audio signal and the pitch-converted audio signal are adjusted to appropriate levels by the level adjustment device 42-1 or 42-2, respectively, and then input to the mixing device 43 and mixed.

According to the basic configuration of FIG. 5, various effects can be obtained by setting the pitch conversion amount when converting the pitch of an input audio signal to a predetermined value.

For example, if the pitch shift amount is set to several tens to one hundred and several tens of cents in the pitch processing device 2, the audio signals are doubled. As a result, even if one voice has a certain thickness, or even if the pitch becomes slightly unstable, it can be absorbed into a double pitch width to reduce the pitch instability. Further, by performing a pitch shift of 3 or 5 degrees on the input audio signal, a harmony can be added, and an effect equivalent to a duet performed by two persons can be realized. .

[0014] When an extreme pitch shift of about one octave is performed, one's voice is changed like another's voice, or a male voice or a female voice is changed to a female voice or a female voice, respectively. A voice change effect that changes to a male voice can be obtained.

FIG. 6 shows still another example of the configuration of the pitch processing device 2. In this configuration example, a pitch conversion device 41-2 and a level adjustment device 42-3 are further added to the two-stage configuration example in FIG. 5 to make a total of three stages.

Thus, in the configuration example shown in FIG. 5, a sound that has been heard twice can be converted into a sound that is thicker and triple.

FIG. 7 schematically shows a sound waveform of the effect realized in the pitch processing device 2 of FIG. Here, the thick solid line indicates the original sound of the input audio signal, and the thin solid line indicates the audio signal whose pitch (pitch) has been converted.

That is, FIG. 7A shows a doubling effect in which two voices whose pitches are shifted by ± 30 cents with respect to the original voice of the input voice signal are mixed to increase the thickness in the vertical direction. FIG. 7B shows a harmony effect realized by adding two sounds whose pitch is shifted by +3 degrees or +5 degrees with respect to the original sound. FIG. 7 (C) shows ± 1 octave (± 1 octave).
A voice change effect realized by mixing two voices whose pitch is shifted by 200 cents) is shown.

[0019]

As described above, in the conventional karaoke apparatus, the effect of doubling, harmony, or voice change can be obtained by changing the value of the pitch conversion amount in one pitch processing apparatus. Therefore, there has been a problem that it is not possible to realize advanced and various effects such as combining a plurality of effects.

The present invention has been made in view of such a situation, and is intended to add advanced and various effects.

[0021]

According to a first aspect of the present invention, there is provided an audio signal multiplexing apparatus comprising: a first pitch conversion means for converting an input audio signal into a signal having a predetermined pitch; and a first pitch conversion means. A first mixing unit that mixes the converted audio signal with the input audio signal; a second pitch conversion unit that converts the audio signal output from the first mixing unit into a signal of a predetermined pitch; A second mixing unit that mixes the audio signal whose pitch has been converted by the second pitch conversion unit with the audio signal output from the first mixing unit.

According to a second aspect of the present invention, there is provided a voice signal multiplexing method.
Converting an input audio signal into a first signal having a predetermined pitch;
Is mixed with the input audio signal to generate a second signal, and the second signal is converted to a third signal having a predetermined pitch.
The method is characterized in that the third signal is mixed with the second signal to generate a fourth signal.

In the audio signal multiplexing apparatus according to the first aspect and the audio signal multiplexing method according to the second aspect,
After the pitch of the input voice signal is converted to a predetermined pitch, the pitch is added to the input voice signal. Similar processing is further performed on the added signal. Then, an audio signal to which advanced and various effects are added is created.

[0024]

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

FIG. 1 shows an embodiment in which the audio signal multiplexing device of the present invention is applied to the pitch processing device 2 of FIG.

In this embodiment, the pitch processing device 2 is configured by connecting the first circuit 20 and the second circuit 30 in cascade. Each of the circuits 20 and 30 has the same configuration as the pitch processing device 2 shown in FIG. That is,
In the first circuit 20, after the level of the input audio signal is adjusted by the level adjustment device 22-1, the mixing device 23
Has been entered. Further, after the pitch of the input audio signal is converted by the pitch conversion device 21, the level is adjusted by the level adjustment device 22-2 and is input to the mixing device 23. The mixing device 23 is configured to add and output the audio signals input from the level adjusting device 22-1 and the level adjusting device 22-2.

In the second circuit 30, the level adjustment 3
2-1, pitch conversion device 31, level adjustment device 32-
2 and the mixing device 33, the first stage first circuit 20
A similar process is performed on the output of.

The first-stage first circuit 20 doubles the input audio signal and outputs the same, and the second-stage second circuit 30 further doubles the audio signal. Is output.

FIG. 2 also shows a case in which the audio signal multiplexing device of the present invention is applied to the pitch processing device 2 of FIG. 4. In the embodiment of FIG. 2, the configuration of the embodiment of FIG. While each of the circuits 20 and 30 has a two-stage configuration, one more stage is added, and the configuration is a total of three stages. That is, as compared with the embodiment of FIG.
0, the stages of the pitch converter 21-1 and the level adjuster 22-3 are added, and in the second circuit 30, the pitch converter 31-2 and the level adjuster 32 are added.
-3 is added.

In this case, the input audio signal is converted into a triple audio signal by the first stage first circuit 20 and output. Then, the triple sound signal output from the first circuit 20 is input to the second circuit 30 in the next stage, and is further tripled. As a result, the input audio signal is 9 (=
(3 × 3) heavy audio signals are output.

FIG. 3 schematically shows the sound waveform of the effect realized by the pitch processing device 2 of FIG. Here, the thick solid line indicates the original sound of the input audio signal, and the thin solid line indicates the sound whose pitch has been converted by the first circuit 20. And
The dashed line indicates a sound whose pitch has been further converted by the second circuit 30.

FIG. 3A shows a pitch converter 21-1, a pitch converter 21-1 of the first circuit 20 in the first stage for the original sound of the input audio signal.
21-2, the pitch is converted by +60 cents or -60 cents, respectively, and the pitch conversion amounts in the pitch conversion devices 31-1 and 31-2 of the second circuit 30 at the next stage are respectively +20 cents or -20 cents. Shows a sound waveform when the doubling effect is realized. In this case, a nine-layer audio signal is obtained. Therefore, compared to the doubling effect according to the conventional method shown in FIG. 6, the sound becomes much thicker.

FIG. 3B shows that the pitch shift amounts in the pitch converters 21-1 and 21-2 of the first circuit 20 in the first stage are +3 degrees or +5 degrees, respectively, and the second stage in the next stage is the second circuit.
The pitch shift amounts in the pitch converters 31-1 and 31-2 of the circuit 30 of FIG.
The waveform when harmony is realized as 0 cents is shown. When such audio processing is performed, richer harmony can be realized.

FIG. 3C shows an audio waveform showing an example in which a more effective voice change is realized. In this case, the pitch converters 21-1 and 21-2 of the first circuit 20 in the first stage are used.
Is +5 degrees or +
1 octave (+1200 cents)
The pitch shift amounts of the pitch converters 31-1 and 31-2 of the circuit 30 of FIG.
It is 0 cents.

At this time, if the original sound of the input sound signal is adjusted so as not to be output by the level adjusting device 32-1, the output sound will sound like the sound of another person with a thick harmony. Further, if signal processing is performed by an equalizer or the like before and after the second circuit 30, it is possible to create an artificial voice of another person.

In the above description of the embodiment, the number of circuits connected in cascade is assumed to be two. However, by connecting three or more circuits in cascade, more complex, sophisticated and diverse sound effects are realized. You can also.

When the number of circuits connected in cascade is M and the number of stages of the pitch converter in each circuit is N, the output audio signal is (N + 1) ^M times as large as one input audio signal. It becomes a multiplex audio signal.

If the respective pitch conversion amounts in the respective stages are set to the same value, it can be used as a simple multiplexing device for audio signals, and the respective stages have different pitch conversion amounts for different effects. Can be set to a value.

That is, by setting the value of the pitch conversion amount arbitrarily in each stage, various effects can be added as compared with the case where the pitch controller has a single-stage configuration.

When a plurality of pitch processing devices are realized by a one-chip DSP (digital signal processor), the entire device can be implemented as compared with a case where a plurality of LSIs for key control or a plurality of devices are used. The configuration can be simplified, the size can be reduced, and the price can be reduced.

[0041]

According to the audio signal multiplexing apparatus according to the first aspect and the audio signal multiplexing method according to the second aspect, the pitch processing apparatus is connected in a plurality of stages in a cascade configuration. Depending on the number of connection stages, multiplexing of audio signals can be realized in a power-like manner, and advanced and various effects can be added.

Further, if the configuration is such that the value of the pitch conversion amount for each stage can be set arbitrarily, various effects can be handled in a complex manner, and it is possible to obtain a more realistic effect.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration example of a pitch processing device to which an audio signal multiplexing device of the present invention is applied.

FIG. 2 is a block diagram showing another configuration example of a pitch processing device to which the audio signal multiplexing device of the present invention is applied.

FIG. 3 is a schematic diagram of an audio waveform illustrating an effect obtained by the configuration of FIG. 2;

FIG. 4 is a block diagram illustrating a configuration example of a karaoke apparatus.

FIG. 5 is a block diagram showing a configuration example of a pitch processing device of FIG. 4;

FIG. 6 is a block diagram showing another example of the configuration of the pitch processing device of FIG. 4;

FIG. 7 is a schematic diagram of an audio waveform illustrating an effect obtained by the configuration of FIG. 6;

[Explanation of symbols]

1 microphone, 2 pitch processing device, 3 reverberation processing device, 4 music playback device, 5 voice canceller, 6 pitch processing device, 7 mixing device, 8-1,
8-2 Speaker, 20 First Circuit, 21, 21
-1, 21-2 pitch converter, 22-1 to 22-
3 level adjustment device, 23 mixing device, 30 second
Circuit of 31, 31-1, 31-2 pitch converter, 32-1 to 32-3 level adjuster, 33
Mixing device, 41, 41-1, 41-2 pitch conversion device, 42-1 to 42-3 level adjustment device, 4
3 mixing equipment

Claims (2)

[Claims] A first pitch conversion means for converting an input voice signal into a signal of a predetermined pitch; and a first pitch conversion means for mixing a voice signal whose pitch has been converted by the first pitch conversion means with the input voice signal. (1) mixing means; (2) second pitch conversion means for converting an audio signal output from the first mixing means into a signal of a predetermined pitch; and (ii) a sound whose pitch has been converted by the second pitch conversion means. An audio signal multiplexing apparatus comprising: a second mixing unit that mixes a signal with an audio signal output from the first mixing unit. 2. An input audio signal is converted into a first signal having a predetermined pitch, the first signal is mixed with the input audio signal to generate a second signal, and the second signal is generated. Converting a third signal having a predetermined pitch into a third signal, and mixing the third signal with the second signal to generate a fourth signal.