Key switch system

Details Key switch system Key switch system

1975-08-11

1977-07-05

Scott, James R.

Music

Instruments

G10F 100

Patent

active

040332217

ABSTRACT:
This key switch system (1) scans closed (or open) key switches in a matrix to produce corresponding key data, (2) encodes these key data into corresponding key codes, and (3) effectively registers the encoded key codes into time-shared channels of a key code memory.
The key switch system may be incorporated in an electronic musical instrument. The system includes a key data generator which produces block data consisting of one pulse per scanning cycle in a time slot representing a block to which a key switch which is ON belongs, and note data consisting of a pulse in a time slot representing the particular key switch which is ON in the block indicated by the block data. A key coder encodes the block data and note data supplied from the data generator into key codes each representing the key name of the depressed key. A channel processor allots the key codes to storage channels of a key code memory having a number of such channels equal to the maximum number of tones to be reproduced simultaneously.

REFERENCES:
patent: 3610799 (1971-10-01), Watson
patent: 3696201 (1972-10-01), Arsem et al.
patent: 3746773 (1973-07-01), Uetrecht
patent: 3871247 (1975-03-01), Bonham
patent: 3882751 (1975-05-01), Tomisawa et al.
patent: 3890871 (1975-06-01), Oberheim
patent: 3899951 (1975-08-01), Griffith

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