Television signal-seeking automatic tuning system

Details Television signal-seeking automatic tuning system Television signal-seeking automatic tuning system

1976-08-23

1977-09-06

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358165, H04N 544, H04N 324

Patent

active

040472264

ABSTRACT:
An intercarrier television receiver is provided with a motor-driven signal seeker coupled to the tuner of the receiver and operative to continuously tune the receiver until stopped by a control signal. The control signal is generated by monitoring and comparing the amplitudes of the picture subcarrier and sound subcarrier signals produced by the IF circuits of the receiver, and by using said comparison to generate a control signal only when the amplitude of the picture subcarrier signal is higher than the amplitude of the sound subcarrier signal by a predetermined ratio. Generation of the control signal interrupts the operation of the signal-seeker at points of correct tuning in a predetermined television frequency spectrum. Provision is also made to mute the picture- and sound-producing channels of the receiver until the signal seeker has tuned the receiver to a point of correct signal reception.

REFERENCES:
patent: 3130264 (1964-04-01), Dietz

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