Key input circuit

Details Key input circuit Key input circuit

1976-01-27

1978-02-14

Yusko, Donald J.

Communications: electrical

Audible indication

Percussion-type sound producer

178 17C, G06F 302

Patent

active

040742628

ABSTRACT:
A key input circuit includes a binary-coded N-ary counter consisting of a plurality of binary counters, a decoder decoding coded pulse outputs of the counter for converting the counter outputs into a plurality of timing pulse signals, which are applied respectively to a plurality of keys. These timing pulse signals form a key information input by manipulation of the corresponding key, and a plurality of gates are provided for coding the key information by gating the input provided by the specific coded pulse output of the counter in response to receipt of the control input provided by the specific key signal applied through the manipulated key.

REFERENCES:
patent: 3662378 (1972-05-01), Mac Arthur
patent: 3675239 (1972-07-01), Ackerman et al.
patent: 3683371 (1972-08-01), Holz
patent: 3717871 (1973-02-01), Hatano et al.
patent: 3721976 (1973-03-01), Kuijsten
patent: 3750113 (1973-07-01), Cencel
patent: 3764791 (1973-10-01), Kashio
patent: 3950743 (1976-04-01), Hatano et al.

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