Method of and apparatus for channel scanning

Details Method of and apparatus for channel scanning Method of and apparatus for channel scanning

1989-12-27

1994-03-29

Chin, Tommy P.

Television

Receiver circuitry

Tuning

348731, 4551841, 4551861, H04N 550

Patent

active

052990117

ABSTRACT:
A channel scanning method for reducing scanning time of a channel in automatic channel memory of TV, VCR, or other video appliance is disclosed. To reduce the scanning time, a microcomputer detects synchronization signals for 300 ms after transmitting frequency data for broadcasting channel to tuner and the micom detects synchronization signals for 30 ms per step in dropping frequency data. The synchronization signal detecting time is 360 ms and is shorter than the prior time of 780 ms.

REFERENCES:
patent: 4271434 (1981-06-01), Sakamoto
patent: 4357632 (1982-11-01), French
patent: 4364094 (1982-12-01), French
patent: 4397038 (1983-08-01), Rzeszewski
patent: 4429415 (1984-01-01), Chin
patent: 4451850 (1984-05-01), Camemoto
patent: 4594611 (1986-06-01), Sugibayashi
patent: 4763195 (1988-08-01), Tults

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