JPH0442297A - Sound processor - Google Patents

Abstract

PURPOSE:To sound a harmony sound to be used as accompanying chords not by simple sound height conversion by converting a sound to be inputted to the harmony sound as the constitutive tone of the accompanying chord. CONSTITUTION:A sound height converting means 5 converts the height of the sound inputted from a sound input means 1 to the height of one or plural tones constituting the chord to be decided by chord information inputted from a chord information input means 15. The sound (harmony sound) converting the height is added to the sound (direct sound) inputted from the microphone 1 and digitally converted by the mixer 6, converted to be analog by a D/A conversion circuit 7, amplified by an amplifier 8 and outputted from a loudspeaker 9. Thus, the height of the input sound can be always converted corresponding to the accompaniment, and the converted chords can be used as the accompaniment.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to an audio processing device that converts the pitch of audio to produce acoustic effects.

Cb11 Prior Art 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. Furthermore, in order to increase the sense of spaciousness and interest of the musical sounds to be produced, devices have been put into practical use that convert the pitch of the sounds to be produced and output them.

fc) Problems 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 (a), 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 separate 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.)
Since the melody simply moves up and down, monotony becomes noticeable when used in long melodies, and when chords are sounded in addition to the melody notes, harmonization with the chords is not considered, making it undesirable. It had the disadvantage of becoming consonant.

SUMMARY OF THE INVENTION An object of the present invention is to provide an audio processing device that solves the problem described above by converting the pitch of input audio based on the chord being played.

(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 is determined by the chord information input from the chord information input means. pitch converting means for converting the chord into one or more chord constituent pitches, and output means for synthesizing and outputting the voice input from the voice input means and the voice converted by the pitch converting means. It is characterized by having the following.

(e1 Function of the Invention In the voice processing device of the present invention, voice is inputted 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. etc.

The pitch of the voice input from the voice input means is converted into one or more chord constituent pitches of a chord determined by the chord information input from the chord information input means (pitch conversion means). In this way, by converting the pitch to chord constituent notes, the pitch of the input voice can always be converted to match the accompaniment, and the converted chord can also be used as the accompaniment.

(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
I.

RAM] 2. External storage device 13. Panel switch +4
and MID1:7 connector 15 are connected. R
OMI 1 stores a program for processing input digital data.

The external storage device 13 is composed of a Fronbi disk device or a karaoke center, and the floppy disk to be sent stores chord sequence data (chord progression data).
is stored in advance. Further, a performance device (electronic musical instrument) such as a keyboard is connected to the MIDI connector 15, and after the chord detection device 17 detects the chord type and root note from the input key data, the chord information is output to the CPU10. The pitch of the voice is detected by the pitch detection circuit 4, and the pitch information is output to the CPU10. CPU
l0 is stored in the external storage device 13, or M
Based on the chord information input via the IDI connector 15, it is determined how much (how many cents) the pitch of the voice input from the microphone 1 should be converted, the pitch is converted from the parameter, and the output is output to the SJ5. do. Pitch conversion LSI5 is CP
The pitch of the voice is converted based on the parameters input from Ul0. Here, the pitch conversion is performed by a well-known method of interpolating data in accordance with the conversion ratio, and the pitch conversion LSJ5 has two buffer clocks 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 IO. The operation in Figure 2 is the operation when chord information is input from the chord sequencer (external storage device 13), and the operation in Figure 3 is the operation when chord information (key data) is input.
This is an operation when inputting from a performance device connected to the MIDI connector 15. This operation takes several ms for CPU10.
This is an operation that is executed every time.

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 (
FFo) 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. In order to cause an externally connected sound source device to produce this chord, this chord information is output to the MIDI connector]5 (n4). Pitch conversion parameters are calculated in order to convert the direct voice into constituent notes of this chord in the accompaniment range and produce the sound (n5). The pitch is converted to a pitch corresponding to the name of the constituent notes of the chord within the accompaniment range (lower pitch than the melody range). For example, the chord component note is G+
, Cz, and Ez, this direct voice will be converted to one of these pitches, and in this case, it is appropriate to select E2, which is a third, as the pitch conversion parameter. . Output this parameter to the pitch conversion LSI 5 (
n6). The pitch conversion LSI 5 which receives this parameter directly converts the voice into harmony voice.

In FIG. 3, first, the buffer of the pitch detection circuit 4 is read (nll). If the pitch is detected, n12
Proceed to n1.3, and if no pitch has been detected, directly return 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 17, the chord is determined (n14). Various methods of chord determination can be applied, such as a conventional method of applying chord constituent tones to a stored table. If the chord can be determined, the pitch conversion parameters for converting the direct voice into the constituent notes of the chord are calculated (n1
5→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 pitch conversion LSI 5 (n1
7). The pitch conversion LSI 5 that receives the parameters directly converts the voice into converted voice. It should be noted that the other constituent tones of the determined chord are not output from the MIDI connector 15 since they have already been sounded by the performance device (electronic musical instrument). Note that if a chord cannot be determined at n14, pitch conversion cannot be performed, and the process returns directly from n15.

In addition, in this embodiment, one pitch conversion LSI 5 is provided to convert to one note among the chord constituent notes.
A plurality of pitch conversion L SI 5 may be provided in parallel so that all chord constituent tones (root, 3rd, 5th, and 7th in the case of a 7th chord) can be converted at the same time. In this way, chords can be produced using only this device. Furthermore, even when outputting only one of the notes in a chord as in this example, an arpeggio-like effect can be created by switching between the root, third, and fifth in a short time. You can also do that. Furthermore, this effect can be similarly (and more complicatedly) realized in a device that can simultaneously output multiple chord constituent tones.

+g+ 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 that is the constituent notes of the accompaniment chord, the accompaniment You can generate harmony sounds that can be used as chords.

[Brief explanation of the drawing]

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. 1-Microphone, 4-Pitch detection circuit, 5-Pitch conversion LSilO-CPU, ]3-External storage device (coat sequencer), 15-MI
DI connector.

Claims (1)

[Claims] (1) a voice input means; a chord information input means; and one or more chord configurations of chords in which the pitch of the voice input from the voice input means is determined by the chord information input from the chord information input means. It is characterized by comprising: pitch conversion means for converting into a pitch; and output means for synthesizing and outputting the voice input from the voice input means and the voice converted by the pitch conversion means. Audio processing device.