Tone signal generating apparatus of electronic musical instrumen

Details Tone signal generating apparatus of electronic musical instrumen Tone signal generating apparatus of electronic musical instrumen

1982-12-15

1984-10-30

Witkowski, S. J.

Music

Instruments

84 124, G10H 102, G10H 700

Patent

active

044794118

ABSTRACT:
Code data representing a plurality of note frequencies are stored in a first ROM and are selectively read out according to key operation of a keyboard. With the operation of a key, predetermined control data is also obtained, and this control data is cumulatively added to or subtracted from the code data as an initial value, whereby a note frequency signal corresponding to the operated key is obtained. Portions of the waveform of the resultant note frequency signal where there is a sharp change in amplitude are interpolated with a sine wave stored in a second ROM.

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patent: 4406204 (1983-09-01), Katoh
patent: 4422362 (1983-12-01), Chibana
patent: 4445414 (1984-05-01), Smith

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