Key assigner

Details Key assigner Key assigner

1975-09-02

1976-09-21

Hix, L. T.

Music

Instruments

84 101, G10F 100

Patent

active

039812170

ABSTRACT:
A key assigner for use in an electronic musical instrument is capable of detecting changes in key switches by comparing present ON-OFF states of the key switches with previous ON-OFF states thereof. Only one of detection signals is delivered out by a priority circuit in a predetermined order of priority and a key code corresponding to this delivered out signal is produced. This key code is compared with key codes of respective channels previously stored in a key code memory having channels equal in number to an available tone number (i.e. a maximum number of tones to be reproduced simultaneously) to detect whether there is coincidence or not. A detection signal produced in a case where there is coincidence represents release of the key, whereas a detection signal produced in a case where there is no coincidence represents new depression of the key, and in this latter case the key code is stored in the key code memory. The outputs of the key code memory are decoded to provide tone generation control signals. An example is shown in which the priority circuit is applied to a monophonic music synthesizer.

REFERENCES:
patent: 3610799 (1971-10-01), Watson
patent: 3697661 (1972-10-01), Deutsch
patent: 3746773 (1973-07-01), Uetrecht
patent: 3760358 (1973-09-01), Isii
patent: 3828643 (1974-08-01), Morez
patent: 3842184 (1974-10-01), Knierkamp
patent: 3899951 (1975-08-01), Griffith et al.

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