Circuit for generating two distinctive tone bursts with exponent

Details Circuit for generating two distinctive tone bursts with exponent Circuit for generating two distinctive tone bursts with exponent

1976-09-14

1977-11-08

Grimm, Siegfried H.

Oscillators

Plural oscillators

Selectively connected to common output or oscillator...

331106, 331108D, 331111, 331173, 331179, 340329, 340384E, H03B 302, H03B 304

Patent

active

040577694

ABSTRACT:
An electrical signal generator comprises an electric wave oscillator for producing oscillations at one or other of two predetermined frequencies, an attenuator device for attenuating oscillations produced by the oscillator in a manner which varies over a period of time, and control means for controlling the oscillator to produce a burst of oscillations at one said predetermined frequency and a subsequent burst of oscillations at the other said predetermined frequency. The control means controls the attenuator device increasingly to attenuate the oscillations over the period of each burst.

REFERENCES:
patent: 3693110 (1972-09-01), Briggs, Jr. et al.
patent: 3875526 (1975-04-01), Beeman et al.
patent: 4001816 (1977-01-01), Yamada et al.

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