JPS63174096A - Electronic musical instrument - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an electronic musical instrument, and particularly to one using a device for changing the pitch of an input audio frequency signal.

<Prior art> Conventionally, as the above-mentioned pitch conversion device, for example,
There is one such as that disclosed in No. 0-184298. As shown in FIG. 4, an audio frequency signal, such as a voice signal, is supplied as an input signal to an analog-to-digital converter 4 via a low-pass filter 2, where it is converted into a digital signal, and this digital signal is written. clock signal r. The digital signals are sequentially read out from the digital memory 6 in synchronization with a read clock signal [V with a frequency different from the write clock signal f0, and the digital-to-analog converter 8 and the low-pass filter 10 are By passing through the audio signal, it is reconverted into an output audio signal and output.

The pitch f1 of this output audio signal is fr=Pf2, where f2 is the pitch of the input signal. Therefore, according to this pitch changing device, the pitch of the audio frequency signal can be changed.

<Summary of the Invention> The present invention aims to provide a novel electronic musical instrument using the above-mentioned pitch conversion device, and includes pitch detection means for detecting the pitch of an audible frequency signal, and a scale signal source for generating a scale signal. a control means for determining the amount of pitch conversion from the output of the pitch detection means and the scale signal from the scale signal source; and a pitch for changing the pitch of the input audio frequency signal according to the amount of pitch conversion from the control means. Converting means.

Effects> If the pitch of the input audio frequency signal is f2, and the pitch of the scale signal is fl, the control means converts the pitch and changes the output signal f3 to f3=P f2 =f.

That is, the pitch of the input audio frequency signal is the pitch f specified by the scale signal.

It has been changed to .

<Effects> As described above, according to the present invention, the pitch of the input audio frequency signal can be changed to the pitch specified by the scale signal. Therefore, for example, if a person's singing voice is input as an input audio frequency signal, a scale signal is generated by the keyboard, and the keyboard is played, the pitch specified by the W keyboard will be obtained, and the original person's singing voice and chorus will be generated. can be done.

<Embodiment> A first embodiment is shown in FIG. 1. In the figure, 12 is a microphone that picks up audio and outputs an audible frequency signal. This audio frequency signal is transmitted to the pitch conversion device 14.
supplied to This pitch conversion device 144↓ has the same configuration as the pitch conversion device described above with reference to FIG.
The read clock signal fv is determined to change the pitch of the input audio frequency signal. In this example, an audible frequency signal based on voice is input, so
Its upper limit frequency is about 1 OKHz. Therefore, the write clock signal f. is 20K according to the sampling theorem.
It is desirable to set it to Hz or more. read clock signal f
As described above, between v and write clock signal f0, fv=P f.

Therefore, the read clock signal f9 is obtained by frequency-dividing the master clock signal using a programmable frequency divider whose frequency division ratio can be changed according to the pitch conversion amount P.

The audio frequency signal from the microphone 12 is also supplied to a pitch detection circuit 16 to detect pitch f2. As this pitch detection circuit 16, for example, Japanese Patent Laid-Open No. 60-17
5099 can be used.

The pitch data detected by the pitch pitch measurement detection circuit 16 is supplied to the control circuit 18. A scale signal is also supplied to the control circuit 18 from a scale signal source 20 . As the scale signal source 20, a mm or a sequencer can be used. In addition, as a scale signal, when a certain key is pressed, the number corresponding to that key and the speed at which the key was pressed are transmitted as a digital signal, which corresponds to the pressed key of the MIDI signal. A digital signal representing the number can be used. The control circuit 18 determines the pitch conversion amount P based on the scale signal and the pitch detected by the pitch detection circuit 16. For example, the pitch f2 detected by the pitch detection circuit l6 is 38Hz, and the scale signal f1 is 440Hz.
Hz, the pitch conversion amount P is 440/380. When a scale signal is supplied as a MIDI signal as described above, it is necessary to convert the key number of the MIDI signal to a frequency corresponding to the key number. A lookup table (not shown) is used for this conversion.

This pitch conversion amount P is supplied to the pitch conversion device 14. The pitch conversion device 14 converts the frequency by -14 by dividing the master clock. As a result, the pitch of the audio frequency signal output from the pitch conversion device 14 is as follows, which is changed to the pitch specified by the scale signal. This pitch-changed audio frequency signal is amplified by an amplifier 22 and supplied to a speaker (not shown).

A second embodiment is shown in FIG. In this embodiment, n pitch converters are provided. And the control circuit 18
When receiving a plurality of scale signals from the scale signal source 20,
Based on the pitch detected by the pitch detection circuit 16 and each scale signal, each pitch conversion amount P to P is calculated. is determined and supplied to each pitch conversion device M14-1 to M14-n, respectively. Therefore, it is possible to simultaneously convert one audio frequency signal into audio frequency signals with different pitches and output them, and by generating a plurality of appropriate scale signals from the scale signal source 20, an acoustic effect similar to a chorus can be achieved. can get.

A third embodiment is shown in FIG. 3. Similar to the second embodiment, this embodiment also simultaneously converts one audio frequency signal into audio frequency signals of different pitches and outputs them. The circuit configuration is simplified compared to the second embodiment. That is, in the second embodiment, a plurality of pitch conversion devices are used! ! Since t14-1 to t14-n are required, the circuit configuration becomes complicated.

Therefore, in the third embodiment, only one pitch conversion device 14 is provided, a plurality of read clock signals are generated like fVI to fvn, and digital signals are read out from the memory 6 in a time-division manner. . The negative part, read clock signals fVI to fvn, are supplied from the control circuit 18 to each pitch conversion amount P1 to P3. ．． It was generated based on. Note that the read digital signal is latched by a corresponding one of the n latch circuits, and then converted into an audio frequency signal via a digital-to-analog converter and a low-pass filter connected to each latch circuit. and output.

In each of the above embodiments, the microphone 12 converts the sound into an audible frequency signal and supplies it to the pitch converter and the pitch detection circuit. It may be generated and supplied to the pitch conversion device and the pitch detection circuit. Furthermore, in each of the above embodiments, the memory of the pitch conversion device may be a digital memory or an analog memory. Furthermore, in each of the above embodiments, the pitch conversion was performed by changing the frequency ratio of the writing clock and the reading clock (variable sampling method), or the clock frequency was constant and the one-step address was changed. It is also possible to use a method (fixed sampling method).

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a first embodiment of the electronic musical instrument according to the present invention, FIG. 2 is a block diagram of the second embodiment, and FIG. 3 is a block diagram of the main parts of the third embodiment. FIG. 4 is a block diagram of a pitch conversion device used in each embodiment. 14.14-1 to 14-n---pitch conversion device,
16... Pitch detection circuit, 18... Control circuit,
2o... scale signal source. Patent Applicant Roland Co., Ltd. Representative Satoshi Shimizu and 2 other talented persons 1
Diagram)

Claims (4)

[Claims] (1) A pitch detection means for detecting the pitch of an audio frequency signal, a scale signal source for generating a scale signal, and inputting the pitch detected by the pitch detection means and the scale signal, and inputting the pitch detected by the pitch detection means and the scale signal, a control means for determining a pitch conversion amount necessary for converting the pitch into a pitch of a musical scale signal; and a pitch for converting the pitch of the audible frequency signal into the pitch represented by the musical scale signal in accordance with the pitch conversion amount from the control means. An electronic musical instrument comprising a conversion means. (2) The scale signal source is configured to simultaneously generate a plurality of scale signals having different pitches, and the pitch conversion means simultaneously converts the audible frequency signal to different pitches represented by the scale signals. An electronic musical instrument according to claim 1, characterized in that the electronic musical instrument is configured to perform the following functions. (3) The electronic musical instrument according to claim 1 or 2, wherein the scale signal source is a keyboard. (4) The electronic musical instrument according to claim 1 or 2, wherein the scale signal is a sequencer.