Automatic turn-off apparatus for a radio or television receiver

Details Automatic turn-off apparatus for a radio or television receiver Automatic turn-off apparatus for a radio or television receiver

1979-08-27

1980-12-23

Richardson, Robert L.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

358188, 3581911, 3581931, 3581951, 358190, 455179, 455192, 455260, 455229, 455230, H04B 116

Patent

active

042414504

ABSTRACT:
A television receiver includes a tuning system comprising a phase locked loop (PLL) configuration and an automatic fine tuning (AFT) configuration which are selectively enabled to operate in response to respective levels of a MODE signal to tune standard and nonstandard frequency RF carriers. In the absence of the RF carrier for a selected channel, the operations of PLL and AFT configurations are alternately enabled and the level of the MODE signal changes accordingly. The MODE signal is applied to a capacitor which develops a control voltage for turning the receiver "off" after the MODE signal has changed levels for a predetermined time because of the absence of a RF carrier.

REFERENCES:
patent: 3218388 (1965-11-01), Jobe et al.
patent: 3906150 (1975-09-01), Ivas
patent: 4031549 (1977-06-01), Rast et al.
Zenith "System 3" Receiver Product Description Model L1320 W May 1979.

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