Electronic chime

Details Electronic chime Electronic chime

1979-04-23

1980-07-29

Pitts, Harold I.

Communications: electrical

Audible indication

Ultrasonic pest control

340384R, G08B 100

Patent

active

042153395

ABSTRACT:
An electronic chime for generating an aural tone comprising an oscillator, an input signal generator for the oscillator, the input signal generated thereby decaying from an initial value to a lower value. The oscillator includes a signal processor (i.e., an amplifier) with a feedback frequency generator connected to the input of the amplifier and being responsive to the output of the amplifier for impressing a desired frequency on the input signal to the amplifier. A speaker and a driver for the speaker are provided, the latter being responsive to the output of the oscillator so as to sound a chime-like aural signal whose amplitude (volume) decays at a predetermined rate while the frequency of the signal remains substantially constant.

REFERENCES:
patent: 4001816 (1977-01-01), Yamada

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