Communications: electrical – Audible indication – Ultrasonic pest control
Patent
1980-12-29
1983-02-22
Pitts, Harold I.
Communications: electrical
Audible indication
Ultrasonic pest control
3403111, G08B 2700
Patent
active
043750613
ABSTRACT:
A digitally driven audio effects generator includes a source of binary information and keyboard which provide digital information to a plurality of source or sink type binary drivers. A ladder matrix is coupled to the binary drivers and provides an output signal. An audio frequency signal generator responds to the keyboard and controls an interrupting switch which serrates the output signal at an audio frequency rate.
REFERENCES:
patent: 4237448 (1980-12-01), Weinberg
Elektor, May 1979, vol. 5, No. 5 "Musical Doorbell".
Electronics, Sep. 28, 1978, JSA, vol. 51, No. 20, "Designers Casebook".
E.T.I., Dec. 1980, vol. 9, No. 12, G.B., "Musical Doorbell".
Ekstrand Roy A.
Goldman Ronald M.
Mattel Inc.
Pitts Harold I.
Shirk Max E.
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