Television channel lock-out apparatus

Details Television channel lock-out apparatus Television channel lock-out apparatus

1978-07-14

1980-11-04

Martin, John C.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

358114, H04N 544

Patent

active

042323967

ABSTRACT:
A television channel lock-out apparatus utilizes a plurality of individual circuits, each comprising at least one impedance element in series with a switch. The individual series of circuits are all disposed in parallel and are connected to a single switch in series therewith, and, if desired, another impedance element. The overall apparatus is disposed in parallel with any portion of a television receiver which carries the individual radio frequency signals for all of the channels handled by the television receiver, or if desired, in parallel with the local oscillator of the receiver. In operation, any one or more individual series circuit switch is closed, and when the master series switch is closed, the impedance elements disposed in electrical relationship with one another either presents a series impedance with the radio frequency signal, or shift the frequency of the local oscillator so as to preclude the receiver operating on one or more selected television channels. The remaining television channels continue to be able to be handled by the receiver by permitting the radio frequency amplifier portions of the receiver and the local oscillator portion of the receiver to function in the usual manner.

REFERENCES:
patent: 2215775 (1940-09-01), Banfield
patent: 2507576 (1950-05-01), Reid
patent: 2907876 (1959-10-01), Smith-Vaniz
patent: 3509500 (1970-04-01), McNair

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