Electronic control circuit

Details Electronic control circuit Electronic control circuit

1975-11-17

1978-01-10

Pitts, Harold I.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340171PF, 343225, 325322, 340311, H04B 106

Patent

active

040681777

ABSTRACT:
A communication receiver for receiving speech and sequential control tones wherein a pulser circuit is provided and rendered operative in a predetermined manner to produce a pulse pattern for intermittently rendering the receiver operative. The receiver comprises a tunable filter for selecting the desired control tones and detector circuits for detecting said control tones to provide a plurality of control signals. Said control signals are employed to control the pulser circuit to render the receiver operative to receive speech and control tones in a predetermined manner. The tunable circuit is responsive to said detected control tones for having its tuning changed to sequentially receive said control tones.

REFERENCES:
patent: RE28222 (1974-11-01), Wycoff
patent: 3488596 (1970-01-01), Webster
patent: 3599100 (1971-08-01), Ward
patent: 3611156 (1971-10-01), Ward
patent: 3670242 (1972-06-01), McGarvey
patent: 3694755 (1972-09-01), Ward
patent: 3774114 (1973-11-01), Dahlgren

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