Signal generator

Details Signal generator Signal generator

1975-05-12

1978-04-25

Caldwell, Sr., John W.

Communications: electrical

Audible indication

Percussion-type sound producer

340337, 340365E, G06F 302, G08C 2500

Patent

active

040865886

ABSTRACT:
A signal generator generates different input signals when the keys are depressed. The signal generator comprises an input signal generating circuit and a double-key-depression detecting circuit. The input signal generating circuit includes a shift register having a plurality of shift stages and the associated output lines, signal lines for transmitting signals which may be sequentially derived from the output lines of the shift stages, and a discriminator for discriminating through which signalline is transmitted the signal.
Each output of the shift stages of the shift register provides one information representative of a depressed key. Output of the discriminator provides another information representative of a depressed key. The input signal is identified by the combination of two kinds of the information.

REFERENCES:
patent: 3179883 (1965-04-01), Farrow
patent: 3448254 (1969-06-01), Verhoeff
patent: 3495232 (1970-02-01), Wagner
patent: 3623082 (1971-11-01), Stein
patent: 3715746 (1973-02-01), Hatano
patent: 3735395 (1973-05-01), Iwabuchi
patent: 3755806 (1973-08-01), Bunting
patent: 3851328 (1974-11-01), Sottile
patent: 3868681 (1975-02-01), Ohyama

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