KR910005222A - Pitch Correction Device for Electronic Instruments - Google Patents

Abstract

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Description

Pitch Correction Device for Electronic Instruments

As this is a public information case, the full text was not included.

2 is a block diagram of a pitch correction apparatus for an electronic musical instrument according to the present invention.

3 is a pitch memory structure diagram according to the present invention;

4 is a structural diagram of a delay distribution memory according to the present invention.

5 is a waveform diagram illustrating a delay point setting according to the present invention.

Claims (1)

Key code signal KC corresponding to the pressed key and a key (A) for generating a keyon pulse signal KONP indicating that one of the keys is pressed, and a code address PA corresponding to the pitch pressed by receiving the key code signal KC from the key (A) Pitch memory that receives the decoder B that generates the upper bits of the delay distribution memory J corresponding to the pressed note and the code address PA of the decoder B, and stores only comparison values corresponding to each pitch. (C) and the AND gate (G) which receives as inputs the key-on pulse signal KONP indicating that one of the keys is pressed from the keyboard (A), the reference clock Φ of the clock generator (H), and the output of the sub-terminal Q of the single-stable oscillator. And an oar gate (Q) which receives a key-on pulse signal KONP and an output signal KSP of the comparator (D), indicating that one of the keys is pressed from the key (A), and a reset signal for outputting the ocade (Q). Getting and gay Binary counter (F) which receives counter (G) output as a clock signal and outputs a counter value, and generates reference clock signals (Φ) of "1" (high) and "0" (low) when power is "on" When the clock generator H applied to the input of the AND gate G and the comparison value from the pitch memory C and the counter value of the binary counter F coincide with each other, a coincidence signal KSP is generated and generated. The comparator D to be applied to the input terminal of Q and the clock terminal C1 of the binary counter E, and the waveform memory M to be read out by increasing by 1 by the coincidence signal KSP of the comparator D. 2 which outputs the value of SK = Φ by receiving the binary counter E and the key-on pulse signal KONP from the keyboard A as a reset signal, receiving the clock signal from the comparator K, and resetting at key-on when the address of? Receive the upper address from the gin counter (I) and the decoder (B), and receive the value of SK = Φ from the binary counter (I) to obtain the first pitch of each pitch. A delay distribution memory J for outputting a delay point address value stored at the first address, a delay point address value of the delay distribution memory J, and a waveform memory M to be read out of the binary counter E at present; A comparator (K) for applying a signal to the clock terminal C1 of the binary counter (I) and the (A) terminal of the monostable oscillator when the delay point address value and the address value of the waveform memory (M) coincide with each other. The negative terminal is applied only for a time corresponding to the time constant Ln 2 · R · C after receiving the signal of the terminal A from the comparator K. The output of is dropped from the value of "1" (high) to "0" (low) and applied to the AND gate G so that the reference clock? Waveform memory that reads the waveform by receiving the waveform address of the monostable oscillator (L) and the binary counter (E) so as to generate an accurate frequency by stopping the binary counter (F) by preventing input to (F). (M), a D / A converter (N) for converting digital information, which is an output of the waveform memory (M), into an analog signal, and an output of the D / A converter (N) through a sound system (0). Pitch correction device for electronic musical instruments, characterized in that configured to include a speaker (P). ※ Note: The disclosure is based on the initial application.