Envelope control device for piezoelectric buzzer

Details Envelope control device for piezoelectric buzzer Envelope control device for piezoelectric buzzer

1980-09-23

1983-05-03

Curtis, Marshall M.

Communications: electrical

Audible indication

Ultrasonic pest control

84 104, 84 114, 84DIG24, 310317, 340384R, G08B 300, H01L 4110

Patent

active

043822517

ABSTRACT:
An envelope control device for the piezoelectric buzzer of the invention applies voltages changing with time to both surfaces of a sound generator for push-pull operation for generating an electric tone. The sound generator comprises an oscillating plate with a piezoelectric element attached thereto, and in response to a tone signal outputted from a tone signal generating circuit, it generates an electric tone. By the push-pull operations, an envelope is applied to the electric tone generated.

REFERENCES:
patent: 3746897 (1973-07-01), Karatjas
patent: 3890612 (1975-06-01), Sweany et al.
patent: 3922672 (1975-11-01), Birt et al.
patent: 4068461 (1978-01-01), Fassett et al.
patent: 4104628 (1978-08-01), Sweany et al.
patent: 4166358 (1979-09-01), Tremblay et al.
patent: 4205517 (1980-06-01), Murakami et al.
patent: 4267586 (1981-05-01), Uchino et al.
patent: 4267589 (1981-05-01), Yamaguchi

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