JP3241038B2 - Audio processing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

[Prior 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 generates 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]

[Problems to be solved by the invention]

By the way, in an electronic musical instrument that produces an additional sound with respect to a single melody as described above, a separate sound source for an additional sound is required in addition to a melody sound source (musical sound wave forming circuit).
There is a disadvantage that the circuit configuration becomes complicated.

[0004] Furthermore, the conventional apparatus for automatically converting the pitch and outputting the pitch simply moves the input voice up and down by a specified pitch (lower fifth, upper third, etc.). When used in a long melody, there is a drawback that monotony is conspicuous, and when a chord is pronounced in addition to the melody sound, harmony with the chord is not considered, resulting in dissonance.

An object of the present invention is to provide a voice processing device which solves the above-mentioned problem by converting the pitch of a voice input based on a chord to be played.

[0008]

[Means for Solving the Problems]

An input means for inputting an audio signal,
Performance information supply means for supplying performance information, chord detection means for detecting a chord from the performance information, and a pitch of the input voice signal being reduced to a pitch of each component sound of the detected chord in a short time. A pitch conversion means for switching the pitch at a time and outputting a voice signal converted to the same pitch, and a mixer for mixing the input voice signal with the voice signal subjected to the pitch conversion by the pitch conversion means. And output means for outputting an audio signal mixed by the mixer.

[0009]

Effect of the Invention

In the voice processing device of the present invention, voice is input from the input means. The input means can be constituted by a microphone, a line input device, or the like. Performance information is input from the performance information supply means. The chord detecting means detects a chord from the performance information, and the pitch converting means switches the pitch of the input voice signal to each pitch of the constituent tones of the detected chord for a short time to perform pitch conversion. Then, the audio signal having the same pitch converted is output. Chord information is information such as chord type (major, minor, 7th, etc.) and root note. This makes it possible to perform pitch conversion while switching the pitch of the input voice signal to each pitch of the constituent chords of the same chord as the performance information such as accompaniment, for a short time. It can maintain a harmonious relationship with the pitch.

[0010]

【Example】

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

The main part of this device is constituted by 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. A
The digital signal converted by the / 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 connected to the CPU 10.

The CPU 10 is also connected to a ROM 11, a RAM 12, an external storage device 13, a panel switch 14, and a MIDI connector 15. The ROM 11 stores a program for processing input digital data. 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 playing device (electronic musical instrument) such as a keyboard is connected to the MIDI connector 15. The chord detecting device 17 detects the type and root of the chord from the key data input, and then outputs chord information to the CPU 10.

The pitch of the voice is detected by a pitch detection circuit 4,
The pitch information is output to 0. CPU 10 is an external storage device
Based on the chord information stored in the memory 13 or input through the MIDI connector 15, it is determined how much (how many cents) the pitch of the voice input from the microphone 1 should be converted. Is output to the pitch conversion LSI 5. The pitch conversion LSI 5 converts the pitch of the voice based on the parameters input from the CPU 10. 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.

The sound whose pitch has been converted (harmony sound) is supplied to a mixer 6.
Is input to 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.

FIG. 2 and FIG. 3 are flowcharts showing the operation of the CPU 10. The operation of FIG. 2 is an operation when chord information is input from a chord sequencer (external storage device 13), and the operation of FIG.
This is an operation when inputting from a performance device connected to the.
This operation is executed by the CPU 10 every several 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 sound is input, the data without pitch detection (FF
_H ) is stored. When a pitch is detected, the process proceeds from n2 to n3, and when a pitch is not detected, the process directly returns from n2.

At n 3, the chord information designated at the present (the timing) is read from the external storage device 13. The chord information is output to the MIDI connector 15 in order to cause the tone generator connected to the outside to emit the chord (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 any of the pitch, the pitch of the E ₂ is a three-degrees sound in this case It is appropriate to select it as a conversion parameter. Output this parameter to pitch conversion LSI5 (n
6). The pitch conversion LSI 5 receiving this parameter directly converts the voice into a harmony voice.

In FIG. 3, first, the buffer of the pitch detection circuit 4 is read (n11). If pitch is detected, n12 to n1
Proceeding to 3, if no pitch is detected, return directly from n12.

At n13, the chord being played at that time by the playing device (electronic musical instrument) connected by the MIDI 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. Determine the chord at 17 (n1
Four). 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 (n17). The pitch conversion LSI 5 receiving this parameter directly converts the voice into the converted voice. It should be noted that other constituent tones 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 to one of the chord constituent sounds.
A plurality of LSIs 5 may be provided in parallel so that they can be simultaneously converted to all chord constituent tones (root, third, fifth and seventh in case of 7th chord). In this way, a chord can be produced only with this device.

In addition, even when only one of the chords is output as in the present embodiment, the root, the third and the fifth are switched in a short period of time, so that an arpeggio-like sound is output. It can also be effective. Further, this effect can be similarly (more complicated) realized in a device that can simultaneously output a plurality of chord constituent sounds.

[0023]

【The invention's effect】

As described above, according to the chord processing device of the present invention, pitch conversion according to performance can be performed by performing pitch conversion of an input audio signal based on performance information such as accompaniment. Also, by performing pitch conversion based on chords detected from this performance information, it is not a simple voice conversion,
The pitch of the input audio signal can be converted to a pitch that is in harmony with the chord of the performance. In particular, it is possible to perform pitch conversion while switching the pitch of an input audio signal to each of the constituent tones of a chord in a short time, thereby producing an effect like an arpeggio.

[Brief description of the drawings]

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

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

FIG. 3 is a flowchart showing an operation of the audio processing device.

[Explanation of symbols]

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

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-174096 (JP, A) JP-A-58-2893 (JP, A) JP-A-59-116696 (JP, A) 126294 (JP, U) Jiko 63-36400 (JP, Y2) (58) Fields investigated (Int. Cl. ⁷ , DB name) G10H 1/00 G10H 1/38

Claims (1)

(57) [Claims] An input unit for inputting an audio signal; a performance information supply unit for supplying performance information; a chord detection unit for detecting a chord from the performance information; The pitch is converted by switching to each pitch of the detected chord component for a short time,
Pitch conversion means for outputting the same pitch-converted audio signal; a mixer for mixing the input audio signal with an audio signal whose pitch has been converted by the pitch conversion means; and a sound mixed by the mixer An audio processing apparatus comprising: an output unit that outputs a signal.