Channel selection apparatus for television receiver

Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry

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3581931, 455166, H04N 544

Patent

active

043285171

ABSTRACT:
A channel selection apparatus of a television receiver having a sequential shift signal input terminal for receiving a sequential shift signal to sequentially shift a selected channel position and an electronic tuning type channel selection IC having a defeat signal output terminal for producing a pulse output when the selected channel position changes and a plurality of channel selection output terminals for producing outputs indicative of the channels to be selected. The channel selection apparatus comprises a synchronizing signal discrimination circuit having a NAND gate and a charge/discharge circuit for detecting a synchronizing signal component appearing in a synchronizing signal separation circuit, a wave shaping circuit for producing a pulse output of a predetermined pulse width when triggered by the output at the defeat signal output terminal, and a NAND gate coupled to the synchronizing signal discriminating circuit, the wave shaping circuit and the sequential shift signal input terminal of the channel selection IC for producing a signal to sequentially shift the selected channel position by applying a signal to the sequential shift signal input terminal when the synchronizing signal discrimination circuit does not detect the synchronizing signal and the wave shaping circuit produces no output, and producing a signal to stop the sequential shift operation when the synchronizing signal discrimination circuit detects the synchronizing signal. This arrangement is particularly useful in selecting a channel which is receiving a broadcasting television station signal when the television receiver is turned on.

REFERENCES:
patent: 4041535 (1977-08-01), Rzeszewski
patent: 4236182 (1980-11-01), Minoura
Low-cost Digital Tuning System with Full Function Automatic Search Preset, Matsu-ura et al, Nov. 1978, pp. 545-551, IEEE Trans on Cons. Elec., vol. CE-24 No. 4.

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