Audio chime-signal generating circuit

Details Audio chime-signal generating circuit Audio chime-signal generating circuit

1979-04-20

1981-02-10

Pitts, Harold I.

Communications: electrical

Audible indication

Ultrasonic pest control

340384R, 84 101, G08B 300

Patent

active

042504961

ABSTRACT:
A circuit for generating an audio chime signal, for use on a passenger aircraft, for example to attract the attention of the passengers prior to a public announcement. High and low frequency oscillators are switched on for respective time periods, the low frequency oscillator being switched on after the high frequency oscillator. Decay circuitry causes a progressive decay in the output of each oscillator and a sine shaper removes harmonics of the high and low frequencies.

REFERENCES:
patent: 4001816 (1977-01-01), Yamada
patent: 4012702 (1977-03-01), Weber
patent: 4110750 (1978-08-01), Heyning

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