JPH0442296A - Sound processor - Google Patents

Abstract

PURPOSE:To sound a harmony sound to be harmonized with accompanying chords not by simple sound height conversion by converting a sound to be inputted to the harmony sound based on the accompanying chords. CONSTITUTION:A sound height converting means 4 converts the height of the sound inputted from a sound input means 1 to the height of the sound to be harmonized based on chord information inputted from a chord information input means 15. The sound (harmony sound) converting the height is added with the sound (direct sound) inputted from a microphone 1 and digitally converted by a mixer 6, converter to be analog by a D/A conversion circuit 7, amplified by an amplifier 8 and outputted from a loudspeaker 9. Thus, the sound height can be always converted corresponding to the advancement of music.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an audio processing device that performs pinch conversion on audio to produce sound effects.

(bl Conventional Techniques 41) In order to make it easier to play electronic musical instruments, electronic musical instruments have been put into practical use that, when a single note melody is played, automatically generates additional notes that match the melody. In order to increase the sense of spaciousness and interest of musical sounds, devices have been put into practical use that convert the pitch of the voice to be produced and output it.

(C1 Problem to be Solved by the Invention) By the way, in an electronic musical instrument that produces additional tones for a single-note melody, as described in -E, in addition to the sound source for the melody (musical sound wave shaping circuit), there is also a sound source for the additional tones. A side sound source is required,
The disadvantage is that the circuit configuration becomes complicated.

In addition, conventional devices that automatically convert and output pitches,
Convert input audio to specified pitch (lower 5th, upper 3rd, etc.)
However, when used with long melodies, the monotony becomes noticeable, and when chords are sounded in addition to the melody notes, harmony with the chords is not considered. Therefore, it had the disadvantage of causing dissonance.

SUMMARY OF THE INVENTION An object of the present invention is to provide a voice processing device that solves the problems listed in F by converting the pitch of a manually generated voice based on a played chord.

(Means for Solving Problem d1) This invention includes a voice input means, a chord information input means, and a pitch of the voice input from the voice input means based on the chord information input from the chord information input means. Pitch conversion means converts the pitch into a pitch that harmonizes with the chord information, and output means synthesizes and outputs the voice input from the voice input means and the voice converted by the pitch conversion means. It is characterized by:

(e1 Function of the Invention In the voice processing device of the present invention, voice is inputted manually from the voice input means.The voice input means can be composed of a microphone, a line input device, etc.) Chord information is inputted from the chord information input means. The chord information is information including the chord type (major, minor 7th, etc.) and the root note.This chord information input means can be a real-time performance device (such as a keyboard) or a chord sequencer that stores chord progressions in advance. It can be composed of the following.

The pitch of the voice input from the voice input means is converted into a harmonious pitch based on the chord information input from the chord information input means (pitch conversion means). A harmonious pitch refers to a note that is a component of a chord or a note that has a frequency that is a simple multiple of the notes that make up the chord. By converting the pitch in this way, it is possible to always convert the pitch in accordance with the progress of the song.

(f) Embodiment FIG. 1 is a block diagram of an audio processing device which is an embodiment of the present invention. This device is a device that converts the pitch of the sound inputted from a microphone 1 using a pitch conversion LSI 5, and then outputs the converted sound together with the original sound using a mixer 6.

The main part of this device is composed of digital circuits.

Audio input from a microphone 1 is amplified by an amplifier 2 and then converted into a digital signal by an A/D conversion circuit 3. A
The digital signal converted by the /D conversion circuit 3 is sent to the pitch detection circuit 4. Pitch conversion LSI5. It is input to mixer 6. The pitch detection circuit 4 and pitch conversion LSI 5 are CPU10.
It is connected to the. In addition to this, CPU10 also has ROMI
IRAMI 2. External memory word W13. Panel switch 1
4 and MIDI connector 15 are connected. R.O.
The MII stores a programmer for processing input digital data.

The external storage device 13 is composed of a floppy disk device or a karaoke set, and the set floppy disk stores court sequence data (chord progression data).
After detecting the chord type and root note from the key data input in step 17, which is stored in advance, CPU10
Outputs chord information to. The pitch of the voice is detected by the pitch detection circuit 4, and the pitch information is output to the CPU 10. The CPUI O determines how much (how many cents) the pitch of the voice input from the microphone 1 should be converted based on the chord information stored in the external storage device 13 or input via the MIDI connector 15. and outputs the parameters to pitch conversion LS5. Pitch conversion L
SI5 is CP 1. Converts the pitch of the audio based on the parameters input from J 1.0. 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 built-in pitch converter, a clock, and an arithmetic circuit for this purpose.

The pitch-converted voice (harmony voice) is input to the mixer 6. The mixer also receives audio input from the microphone 1 and digitally converted (direct audio). The mixer 6 adds these harmonic voices and direct voices and inputs the sum to the D/A conversion circuit 7. The D/A conversion circuit 7 converts the added signal into analog. The analog-converted audio is amplified by an amplifier 8 and output from a speaker 9.

FIGS. 2 and 3 are flowcharts showing the operation of the CPU 10. The operation shown in FIG. 2 is the operation when chord information is input from the court sequencer (external storage device) 3), and the operation shown in FIG. This is the operation when inputting from a device. This operation is CP t, J 1
0 is an operation executed every several nanoseconds.

In FIG. 2, first, the buffer of the pitch detection circuit 4 is read (nl). When the pitch detection circuit 4 is able to detect the pitch of the input voice, the pitch is stored in the buffer. If the pitch cannot be detected or if no audio is input, the buffer contains data without pitch detection (
FFH) is stored. If the pitch has been detected, the process proceeds from n2 to n3; if the pitch has not been detected, the process returns directly from n2. At n3, the currently specified chord information (at that timing) is read from the external storage device 13. This chord information is output to the MIDI lid 15 in order to cause the externally connected sound source device to produce this chord (n4). Pitch conversion parameters are calculated in order to produce an additional note that is consonant with this chord within the melody range (n5). The pitch is converted to a pitch within the melody range (a pitch higher than the accompaniment range) that corresponds to the note name of the chord that is closest to the direct voice (however, it is not the same pitch). For example, if the pitch of the direct voice is 04 and the chord constituent notes are G1C2 and E2, the pitch corresponding to the chord constituent note name within the melody range is G3. Ca, B a, and E4 is selected as the pitch of the pitch conversion parameter. This parameter is output to the pitch conversion LSI 5 (n
6). The pitch conversion LSI 5 which receives this parameter directly converts the voice into a mnemonic voice.

In FIG. 3, first, the pitch detection circuit 4 reads Ha Nofa (n11.). n if pitch is detected
The process advances from step 12 to n13, and if no pitch has been detected, returns directly from n12. At step n13, the chord being played at the time on the performance device (electronic musical instrument) connected via the MIDI connector 15 is read. In this case, if the performance device is a device that outputs chord information, the chord information can be used directly, but if the performance device does not output chord information, the chord detection device 1?17 to judge the chord (n14). Various methods of chord determination can be applied, such as a conventional method of applying chord constituent tones to a stored table.

If a chord has been determined, pitch conversion parameters are calculated in order to generate an additional note that is consonant with the chord within the melody range (n15→n16). This conversion method is the same as the method described above with reference to FIG. 2, so its explanation will be omitted here. This parameter is output to the pitch conversion LSI 5 (n17). The pitch conversion LSI 5 that receives this parameter converts the direct voice into converted voice. Note that since the determined chord has already been sounded by the performance device (electronic musical instrument), there is no need to output it as MIDI again.

Note that if a chord cannot be determined in n14, pitch conversion cannot be performed, so the test method that returns directly from n15 uses a pitch related to the range of the directly input voice. In addition, the root tone of the chord that is pronounced as an accompaniment note (about two octaves lower than the melody note)
Various conversion methods can be considered, such as converting the pitch of a harmony tone from a pitch of an integer multiple of the pitch to a pitch of an integer multiple, regardless of the range of the direct tone.

fg) Effects of the Invention As described above, according to the audio processing device of the present invention, by converting the input audio into harmony audio based on the accompaniment chord, it is possible to convert the input audio into harmony audio based on the accompaniment chord, rather than simply converting the pitch. It is possible to pronounce a harmonic voice that harmonizes with the

[Brief explanation of drawings]

FIG. 1 is a block diagram of an audio processing device according to an embodiment of the present invention, and FIGS. 2 and 3 are flowcharts showing the operation of the audio processing device. Note that the variables for determining the harmony pitch of this embodiment are: 1-microphone, 4-pitch detection circuit, 5-pitch conversion LS I, ], 0-CPU. 13-External storage device (code sequencer) 1.5-MI
DI connector.

Claims (1)

[Claims] (1) a voice input means; a chord information input means; and a method for adjusting the pitch of the voice input from the voice input means to a pitch that harmonizes with the chord information based on the chord information input from the chord information input means. A sound processing device comprising: pitch converting means for converting the pitch; and output means for synthesizing and outputting the sound input from the sound input means and the sound converted by the pitch converting means. .