Key switch signal multiplexer circuit

Details Key switch signal multiplexer circuit Key switch signal multiplexer circuit

1973-07-26

1976-10-19

Springborn, Harvey E.

Communications: electrical

Audible indication

Percussion-type sound producer

G08C 100

Patent

active

039874370

ABSTRACT:
A key input circuit characterized in that a plurality of keys are divided into a plurality of key blocks, that a plurality of series of timing pulses of a first group are supplied to the respective key blocks, each series of timing pulses differing in phase from each other series of timing pulses, thereby to multiplex information on the respective keys of each key block, and that the multiplexed key information from the respective blocks is further multiplexed by a plurality of series of timing pulses of a second group, the timing pulses of the second group being longer in duration than the timing pulses of the first group.

REFERENCES:
patent: 3588838 (1971-06-01), Felcheck
patent: 3624376 (1971-11-01), Kitz
patent: 3631403 (1971-12-01), Asbo et al.
patent: 3651463 (1972-03-01), Rawson et al.
patent: 3715746 (1973-02-01), Hatano
patent: 3761918 (1973-09-01), Hatano et al.
patent: 3900845 (1975-08-01), Tsuiki et al.

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