Warning chord sound producing apparatus including an integrated

Details Warning chord sound producing apparatus including an integrated Warning chord sound producing apparatus including an integrated

1986-01-02

1988-02-09

Rowland, James L.

Communications: electrical

Audible indication

Ultrasonic pest control

340384R, 340388, G10K 912

Patent

active

047244240

ABSTRACT:
A 1-bit microcomputer driven by a clock signal has first and second output ports. The signals from these output ports control first and second transistors whose output signals are supplied to step-up transformers. The output signals from these transformers drive the sounding devices constructed of piezoelectric elements to produce a chord sound. The memory of the microcomputer stores a program by which first and second square-wave pulse-train signals formed of a combination of a plurality of square wave pulses and in which each unit pulse train has a mutually different basic frequency are output from the first and second output ports.

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U.S. Ser. No. 682,755, filed 12-17-84, by Nakashima et al.

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