Television – Basic receiver with additional function – Multimode
Patent
1996-08-22
1998-07-21
Burgess, Glenton B.
Television
Basic receiver with additional function
Multimode
348555, 348557, H04N 546
Patent
active
057841179
ABSTRACT:
The automatic-discriminating apparatus is constituted by functional blocks such as a killer circuit, an APC circuit, a switch, and an automatic discrimination control circuit. The switch connects one of crystal oscillators to a VCO of the APC circuit by a control signal from the automatic discrimination control circuit. The automatic discrimination control circuit divides one vertical scanning period into predetermined sections. When receiving a killer signal indicating the OFF state from the killer circuit at the predetermined sections even one time, it outputs a control signal holding the connection state thereof to the switch, and holds the APC circuit in the locking state. When receiving a killer signal indicating the ON state at the divided predetermined sections a predetermined number of times, it outputs a control signal connecting the other crystal oscillator through the VCO to the switch. As a result, the time for discriminating the TV broadcast systems can be shortened, a malfunction can be avoided, and a stable discrimination can be achieved.
REFERENCES:
patent: 5119177 (1992-06-01), Lin
patent: 5239367 (1993-08-01), Sato
patent: 5311301 (1994-05-01), Jae-Gyun
patent: 5579056 (1996-11-01), Chang
Arimizu Akira
Mitarai Shozu
Burgess Glenton B.
Kananen Ronald P.
Sony Corporation
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