Keyboard switch circuit for use in a matrix which has a series c

Details Keyboard switch circuit for use in a matrix which has a series c Keyboard switch circuit for use in a matrix which has a series c

1975-09-30

1979-03-20

Yusko, Donald J.

Communications: electrical

Audible indication

Percussion-type sound producer

307243, 307290, 340365L, G06F 302

Patent

active

041456874

ABSTRACT:
A keyboard switch circuit comprises a first plurality of terminals associated with m rows and a second plurality of terminals associated n columns. A plurality of series circuits each including a reluctance element and a diode are connected between the terminals associated with the rows and the columns, respectively, in a manner to correspond with key switches. By applying input pulse signals to the terminals of the rows, a keyboard signal corresponding to a key depressed is derived in the form of pulses on the terminals associated with the columns.

REFERENCES:
patent: 3129418 (1964-04-01), De La Tour
patent: 3307148 (1967-02-01), Fukamachi
patent: 3522450 (1970-08-01), Meunter
patent: 3764818 (1973-10-01), Masuda
patent: 3845473 (1974-10-01), Kawashima
patent: 3949365 (1976-04-01), Kashio

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