Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1982-02-25
1984-03-20
Chin, Tommy P.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 19, 358 25, H04N 950, H04N 942
Patent
active
044384513
ABSTRACT:
Dual-standard (PAL/SECAM) color TV receiver includes circuitry for automatically controlling the receiver's operating mode in accordance with recognition of the SECAM or PAL format of the received signals. A first sample-and-hold circuit monitors the output of an FM detector responsive to the received signals during blanking "backporch" portions of alternate line intervals, while a second sample-and-hold circuit monitors the output of said FM detector during blanking "backporch" portions of the intervening line intervals. Comparison of the outputs of the two sample-and-hold circuits achieves the desired format recognition. To avoid false recognition, sampling interval beginning is delayed relative to beginning of SECAM lead-in oscillations or PAL swinging bursts, while sampling interval termination substantially coincides with end of blanking interval.
REFERENCES:
patent: 4233622 (1980-11-01), Groeneweg
patent: 4240102 (1980-12-01), Groeneweg
patent: 4263608 (1981-04-01), Hinn
patent: 4357623 (1982-11-01), Hinn
Hinn Werner
Knight Mark B.
Chin Tommy P.
Meagher William H.
Rasmussen Paul J.
RCA Corporation
Whitacre Eugene M.
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