JP2000187490A - Sound processing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent sound from becoming monotone and dissonance when creating harmonized sound by converting a pitch of an inputted sound signal. SOLUTION: A sound signal (direct sound signal) inputted from a microphone 1 is converted in pitch by a pitch converter LSI 5, and the pitch-converted sound signal (converted sound signal) and the direct sound signal are mixed by a mixer 6 and outputted. The pitch converter LSI 5 converts the pitch of said sound signal to a pitch decided based on the performance information to be inputted from the performance information read from a storage device and an external device. Thus, it becomes possible to automatically pitch-convert sound into consonance based on an automatic performance, and pitch-convert to various instruments.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a voice processing apparatus for converting the pitch of a voice to produce a sound effect.

[0002]

2. Description of the Related Art In order to make it easier to play an electronic musical instrument, an electronic musical instrument has been put to practical use that automatically produces an additional sound in accordance with the melody of a single note played. Further, in order to increase the sense of spread and fun of musical tones to be pronounced, devices for converting and outputting pitches of sounds to be produced have been put to practical use.

[0003]

As described above, in an electronic musical instrument that produces an additional sound for a single-tone melody as described above, a separate sound source for the additional sound is provided in addition to the melody sound source (musical sound wave forming circuit). Is required, and there is a disadvantage that the circuit configuration becomes complicated.

A conventional apparatus for automatically converting pitches and outputting the pitches uses an input voice at a designated pitch (lower 5 pitches).
Degree, upper third degree, etc.)
When used in a long melody, it becomes monotonous,
In the case where a chord is pronounced in addition to the melody tone, there is a drawback that the harmony with the chord is not considered, and thus the discord becomes dissonant.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a voice processing apparatus which solves the above-mentioned problem by converting the pitch of a voice input based on performance information to be played.

[0006]

According to a first aspect of the present invention, there is provided a voice input means for inputting a voice signal, a storage means for storing performance information, a reading means for reading performance information from the storage means, and a voice input means. Pitch conversion means for performing pitch conversion of an input voice signal based on performance information read by the read means, and a mixer for mixing the input voice signal with a voice signal subjected to pitch conversion by the pitch conversion means When,
Output means for outputting an audio signal mixed by the mixer.

According to a second aspect of the present invention, in the first aspect, the performance information stored in the storage means is chord sequence information indicating chord progression.

According to a third aspect of the present invention, there is provided a sound input means for inputting a sound signal, a performance information input means for inputting performance information from an externally connected device, and a sound information input by the input means. Pitch conversion means for converting the pitch based on the performance information input by the means, a mixer for mixing the input audio signal with the audio signal subjected to the pitch conversion by the pitch conversion means, and a sound mixed by the mixer Output means for outputting information.

According to a fourth aspect of the present invention, there is provided a voice input means for inputting a voice signal, a performance information input means for inputting performance information, and a chord detection means for detecting a chord from the performance information input by the performance information input means. Converting means for converting the voice signal input by the voice input means into a pitch in an accompaniment tone range based on the chord detected by the chord detecting means; and converting the input voice information into pitch information by the pitch converting means. It is characterized by having a mixer for mixing audio signals of pitches and output means for outputting audio information mixed by the mixer.

[0010] In the voice processing apparatus of the present invention, a voice signal is input from the voice input means, and the voice signal is pitch-converted by the pitch conversion means. The pitch-converted audio signal (converted audio signal) and the audio signal (direct audio signal) input from the audio input unit are mixed by a mixer and output. The voice input means can be constituted by a microphone, a line input device, or the like.

The pitch conversion means changes the pitch of the voice signal to a pitch different from the input pitch. According to the invention of claim 1, the pitch conversion means converts the pitch based on the performance information read from the storage means. I do. This allows the user to obtain a new audio signal in which the input voice is pitch-converted based on the read performance information only by instructing the reproduction, so that the harmony by the pitch voice of the user can be obtained with a simple operation. Can be obtained. Also, if a chord sequence of a music piece is stored and a new pitch sound is given based on this, the melody can be singed and the chord part sound can be given, so that the musical A variety of harmony can be obtained.

According to the third aspect of the present invention, the pitch of an input voice is converted based on performance information input from an external device. The device for inputting performance information can be changed in various ways, for example, by connecting to a performance device with a different playing style.There are a wide variety of ranges and methods that can be selected when converting the input voice to generate a converted voice signal. There is an advantage that it becomes.

According to the fourth aspect of the present invention, for the input voice,
Since the sound of the accompaniment range is added, when the singer sings the melody part, the harmony of the accompaniment part is automatically added, and harmony suitable for music can be generated.

[0014]

FIG. 1 is a block diagram of an audio processing apparatus according to an embodiment of the present invention. This device is a microphone 1
This is a device that converts the voice input from the LM into a pitch by the pitch conversion LSI 5 and then outputs the voice together with the original voice by the mixer 6.

The main part of this device is composed of a digital circuit. The audio input from the microphone 1 is amplified by the amplifier 2 and then converted into a digital signal by the A / D conversion circuit 3. The digital signal converted by the A / D conversion circuit 3 is input to a pitch detection circuit 4, a pitch conversion LSI 5, and a mixer 6. The pitch detection circuit 4 and the pitch conversion LSI 5 are C
It is connected to PU10. In addition to this, the CPU 10
The ROM 11, RAM 12, external storage device 13, panel switch 14, and MIDI connector 15 are connected. The ROM 11 stores a program for processing input digital data. The external storage device 13 is composed of a floppy disk device or a karaoke set. Chord sequence data (chord progression data) is stored in the floppy disk to be set in advance. A performance device (electronic musical instrument) such as a keyboard is connected to the MIDI connector 15.
After detecting the root, chord information is output to the CPU 10.
The pitch of the voice is detected by a pitch detection circuit 4 and the CPU
The pitch information is output to 10. The CPU 10 controls the microphone 1 based on chord information stored in the external storage device 13 or input through the MIDI connector 15.
It is determined how much (how many cents) the pitch of the voice input from should be converted, and the parameter is converted to the pitch conversion LS
Output to I5. The pitch conversion LSI 5 converts a pitch of a direct voice, which is an input voice signal, based on a parameter input from the CPU 10 to generate a converted voice. Here, the pitch conversion is performed by a well-known method of interpolating data in accordance with the conversion ratio, and the pitch conversion LSI 5 has a buffer, a clock, and an arithmetic circuit for this purpose.

Pitch-converted speech (harmony speech)
Is input to the mixer 6. The sound (direct sound) input from the microphone 1 and converted into digital is also input to the mixer. The mixer 6 adds the harmony sound and the direct sound and inputs the result to the D / A conversion circuit 7. The D / A conversion circuit 7 converts the added signal into an analog signal. The analog converted sound is amplified by the amplifier 8 and output from the speaker 9.

FIGS. 2 and 3 are flowcharts showing the operation of the CPU 10. The operation in FIG. 2 is an operation when chord information is input from a chord sequencer (external storage device 13), and the operation in FIG. 3 is chord information (key data).
Is input from a performance device connected to the MIDI connector 15. This operation is performed by the CPU 10
This operation is executed every ms.

In FIG. 2, first, the buffer of the pitch detection circuit 4 is read (n1). When the pitch detection circuit 4 can detect the pitch of the input voice, the pitch is stored in the buffer. If no pitch is detected or no voice is input, data without pitch detection (FF _H ) is stored in the buffer. When the pitch is detected, the process proceeds from n2 to n3, and when the pitch is not detected, the process directly returns from n2. In n3, the chord information currently specified (at the timing) is read from the external storage device 13. In order for an externally connected tone generator to emit the chord, a MIDI connector 15 is provided.
This chord information is output to the device (n4). A pitch conversion parameter is calculated to convert the direct sound into a constituent sound of this chord in the accompaniment tone range and generate the sound (n5). The pitch is converted to a pitch corresponding to a constituent note name of a chord within an accompaniment tone range (a pitch lower than the melody range). For example, if the chord constituent notes is G _1, C _2, E _2, the direct sound will be converted to this one of pitch, pitch and E ₂ is a three-degrees sound in this case It is appropriate to select it as a conversion parameter. This parameter is output to the pitch conversion LSI 5 (n6). Pitch conversion LS receiving this parameter
I5 directly converts the voice into harmony voice.

In FIG. 3, first, the buffer of the pitch detection circuit 4 is read (n11). When the pitch is detected, the process proceeds from n12 to n13, and when the pitch is not detected, the process directly returns from n12. MI in n13
The chord currently played by the playing device (electronic musical instrument) connected by the DI connector 15 is read. In this case, if the playing device is a device that outputs chord information, the chord information may be used directly.If the playing device does not output chord information, a chord detecting device based on the input key press pattern or the like is used. At 17, a chord is determined (n14). A variety of chord determination methods can be applied, such as a method of applying a chord component to a table that stores chord component sounds that are well known in the art. If the chord can be determined, a pitch conversion parameter for directly converting the voice into a constituent sound of the chord is calculated (n15 → n16). Since this conversion method is the same as the method described with reference to FIG. 2, the description is omitted here. This parameter is output to the pitch conversion LSI 5 (n
17). The pitch conversion LSI 5 receiving this parameter directly converts the voice into the converted voice. The other constituent sounds of the determined chord are not output again from the MIDI connector 15 assuming that they have already been generated by the performance device (electronic musical instrument). If the chord cannot be determined in n14, pitch conversion cannot be performed, and the process directly returns from n15.

In this embodiment, one pitch conversion LSI 5 is provided so as to convert it into one of the chord constituent sounds. However, a plurality of pitch conversion LSIs 5 are provided in parallel, and all the chord constituent sounds ( A root tone, a third note, a fifth note, and a seventh note in the case of a 7th chord) may be simultaneously converted. In this way, a chord can be produced only with this device.
Even when only one of the chords is output as in this embodiment, an effect like an arpeggio can be obtained by switching between the root, the third and the fifth in a short time. You can also. Further, this effect can be similarly (more complicated) realized in a device that can simultaneously output a plurality of chord constituent sounds.

[0021]

According to the first aspect of the present invention, pitch conversion is performed based on performance information read from the storage means. This allows the user to obtain a new audio signal in which the input voice is pitch-converted based on the read performance information only by instructing the reproduction, so that the harmony by the pitch voice of the user can be obtained with a simple operation. Can be obtained. Also,
If the chord sequence of the music is stored and the voice of the new pitch is given based on this, the voice of the chord part can be given by singing the melody, so that it is musically diverse. Harmony can be obtained.

According to the third aspect of the present invention, the pitch of an input voice is converted based on performance information input from an external device. The device for inputting performance information can be changed in various ways, for example, by connecting to a performance device with a different playing style.There are a wide variety of ranges and methods that can be selected when converting the input voice to generate a converted voice signal. There is an advantage that it becomes.

According to the fourth aspect of the present invention, for the input voice,
Since the sound of the accompaniment range is added, when the singer sings the melody part, the harmony of the accompaniment part is automatically added, and harmony suitable for music can be generated.

[Brief description of the drawings]

FIG. 1 is a block diagram of an audio processing apparatus according to an embodiment of the present invention;

FIG. 2 is a flowchart showing the operation of the voice processing device.

FIG. 3 is a flowchart showing the operation of the voice processing apparatus.

[Explanation of symbols]

1. Microphone, 4. Pitch detection circuit, 5. Pitch conversion LSI,
10 CPU, 13 external storage device (code sequencer), 15 MIDI connector.

Claims (4)

[Claims] 1. A voice input means for inputting a voice signal, a storage means for storing performance information, a reading means for reading performance information from the storage means, and a voice signal input by the voice input means being read by the reading means. Pitch conversion means for performing pitch conversion based on output performance information; a mixer for mixing an input audio signal with an audio signal whose pitch has been converted by the pitch conversion means; an audio signal mixed by the mixer And an output unit that outputs the audio signal. 2. The audio processing apparatus according to claim 1, wherein the performance information stored in the storage means is chord sequence information indicating chord progression. 3. A sound input means for inputting a sound signal, a performance information input means for inputting performance information from an externally connected device, and a sound signal input by the input means being input by the performance information input means. Pitch conversion means for converting the pitch based on the performance information, a mixer for mixing the input audio signal with the audio signal converted by the pitch conversion means, and outputting the audio information mixed by the mixer And a sound processing device comprising: 4. A voice input means for inputting a voice signal, a performance information input means for inputting performance information, a chord detection means for detecting a chord from the performance information input by the performance information input means, and a voice input means. Conversion means for converting the input voice signal to a pitch in an accompaniment tone range based on the chord detected by the chord detection means; and input voice information into which the pitch converted by the pitch conversion means is converted. An audio processing device comprising: a mixer that mixes audio signals; and an output unit that outputs audio information mixed by the mixer.