Channel selection apparatus

Details Channel selection apparatus Channel selection apparatus

1980-07-14

1982-12-07

Chin, Tommy P.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455167, 455258, 455264, H04B 116

Patent

active

043631347

ABSTRACT:
In a channel selection apparatus for a television receiver or FM radio receiver having an electronic tuner, a local oscillation signal of the electronic tuner having a local oscillator which is swept by a voltage sweeping circuit is passed through a comb-shape filter having a SAW element. Peak outputs from the comb-shape filter are counted by a presettable counter. When the count reaches a preset count, the sweeping operation of the voltage sweeping circuit is stopped to select a desired channel. A portion of the peaks of the comb-shape filter characteristic is attenuated and a gap appearing at the attenuated portion is detected by the frequency sweep of the local oscillation signal with a change in time interval. The detection signal is compared to discriminate the first pulse necessary for the channel selection.

REFERENCES:
patent: 3798553 (1974-03-01), Sakamoto
patent: 3864636 (1975-02-01), Fukuda
patent: 3893032 (1975-07-01), Sakamoto
patent: 4004233 (1977-01-01), Sakamoto
patent: 4232397 (1980-11-01), Murata et al.
patent: 4270219 (1981-05-01), Murata et al.

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