Key switch information assignor

Details Key switch information assignor Key switch information assignor

1979-12-17

1982-11-09

Witkowski, S. J.

Music

Instruments

84 126, 3403655, G10H 1057, G10H 118

Patent

active

043578497

ABSTRACT:
A key switch information assignor having a data processor unit which produces keyboard and octave codes which serve to poll and interrogate a keyboard circuit. In response to the polling, the keyboard circuit produces key information representing the depression and release of keyboard switches in the keyboard circuit. This key information is compared by the data processor unit with previous key information to determine an event of key depression or release. In response thereto, a note code is determined combining the key information with the keyboard and octave codes. The key code is then sent to an assignment memory for further use. An envelope generator is provided which sends signals to the data processor unit to indicate the end of note sounding and thereby release of the key code from the assignment memory. Special arrangements are made for high speed release when a demand signal is generated in the case of all channels of the assignment memory being utilized.

REFERENCES:
patent: 4022098 (1977-05-01), Deutsch et al.
patent: 4046047 (1977-09-01), Roberts
patent: 4141268 (1979-02-01), Kugisawa
patent: 4179968 (1979-12-01), Suzuki
patent: 4179972 (1979-12-01), Hiyoshi et al.

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