Back to results
US 4,382,251 AGranted
Envelope control device for piezoelectric buzzer
AssigneeCasio Computer Co., Ltd.
InventorHidetaka Fujisawa
Life of this patent
Estimating the term…
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.
Claims6
An envelope control device for a piezoelectric buzzer comprising:
- a sound generator having two surfaces, and comprising an oscillating plate with a piezoelectric element attached thereto;
- a power source for supplying voltages to be applied to both surfaces of said sound generator;
- tone signal generating means for generating a tone signal for generating an electric tone;
- and
- envelope control means for changing with time voltages to be applied to said both surfaces of said sound generator for supplying said changing voltages to said sound generator for push-pull operation, thereby providing an envelope to a generated electric tone.
2 more elements
Dependencies are inferred from the claim text.