Tuner bandswitching system for a television tuning system

Details Tuner bandswitching system for a television tuning system Tuner bandswitching system for a television tuning system

1974-06-03

1976-09-14

Griffin, Robert L.

325459, H04B 132

Patent

active

039809595

ABSTRACT:
A tuner bandswitching system for a television receiver tuning system wherein a reset pulse generated at the completion of the selection of a channel to be received is utilized to determine the initial stable state of a series of bistable circuits and to provide a bandswitch reset pulse for use in establishing an initial voltage output from a voltage sweep generator utilized to scan a varactor tuned VHF tuner or a varactor tuner through one or more bands of frequencies. The bistable circuits control switching voltages supplied to the VHF tuner and the UHF tuner to provide for sequencing of the tuning system serially through, for example, the low VHF band, the high VHF band, and the UHF band until the appropriate band has been selected wherein the selected channel can be tuned. When the selected channel is tuned, a hold signal is developed. Data identifying the channel being received during a sweep through a given band is accumulated in a counter. At a predetermined output of the counter (e.g., "06" or "13") in the absence of the hold signal, the state of the bistable circuits is changed. As the state of a bistable circuit is changed, a bandswitch reset pulse is provided to again reset the voltage sweep generator in preparation for the scanning of the next band in the aforementioned sequence of bands.

REFERENCES:
patent: 3259851 (1966-07-01), Brauer
patent: 3818353 (1974-06-01), Sakamoto
patent: 3846707 (1974-11-01), Sakamoto
patent: 3857107 (1974-12-01), Lieberman et al.

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