Electronic calculator with acoustic confirmation of key actuatio

Details Electronic calculator with acoustic confirmation of key actuatio Electronic calculator with acoustic confirmation of key actuatio

1981-07-16

1983-10-25

Groody, James J.

Communications: electrical

Audible indication

Percussion-type sound producer

340365R, 340365E, 340384R, 364709, 364737, G06F 302

Patent

active

044122101

ABSTRACT:
An electronic calculator is provided which generates confirmation sounds identifying actual depression of any keys of a keyboard. The calculator includes a piezoelectric acoustic element which is responsive to key signals derived from a processor unit when any keys of the keyboard are manually operated. The calculator generates these sounds only for a fixed period of time starting with actual depression of any keys. The processor unit generates key-strobe signals which are input to the keys on the keyboard. Each key has its own key-strobe signal, and, when depressed, the signal is passed to the processor uniquely identifying each key. The processor generates sound instruction signals indicative of normal and erroneous operational states in the calculator in accordance with the received key-strobe signals. An audible confirmation or alarm sound is then generated in accordance with the sound instruction signal.

REFERENCES:
patent: 3588875 (1971-06-01), Gabor
patent: 3715746 (1973-02-01), Hatano
patent: 3932866 (1976-01-01), Sasaki
patent: 3973255 (1976-08-01), Freeman
patent: 3978474 (1976-08-01), Engstrom
patent: 4014016 (1977-03-01), Sherritt et al.
patent: 4020467 (1977-04-01), Hashimoto et al.
patent: 4037200 (1977-07-01), Cranmer
"A Step-by-Step Introduction to 8080 Microprocessor Systems", 1977; pp. 1-4 and 129-135.
"Programming Microprocessors", Mar. 1977; pp. 10-13.
"Motorola Series In Solid-State Electronics", Dec. 1, 1975; pp. Preface, 4-88, 7-72.
"Designing With Microprocessors", Nov. 16, 1976; pp. 1-15 to 1-18.
"Applying Microprocessors-New Hardware, Software and Applications"; Jun. 6; 1977; pp. 3-18.

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