Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1984-10-18
1985-08-13
Shepperd, John W.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358139, H04N 962
Patent
active
045353530
ABSTRACT:
The horizontal sync component of a composite video signal having a rate H is provided to a phase locked loop (PLL) in the front end of a video signal receiver for synthesizing a horizontal rate signal. A composite sync signal and a 2H signal from the PLL are provided to a vertical reference signal identification circuit which samples the composite sync signal with the positive-going edge of the 2H pulse. The composite sync signal will only be high on a positive-going edge of the 2H pulse during the broad pulses of the composite sync signal. The vertical reference signal identification circuit counts six 2H pulses to establish a precise three horizontal line reference. If the width of the vertical sync pulse from the first encountered broad pulse to the last, without the occurrence of any discontinuities as defined by a high sample obtained by the positive transition of the 2H pulse, is equal to the three horizontal lines, then a vertical reference signal is provided.
REFERENCES:
patent: 3989891 (1976-11-01), Freestone
patent: 4170026 (1979-10-01), Nagaoke et al.
patent: 4172262 (1979-10-01), Hosoya
patent: 4198651 (1980-04-01), Barton et al.
Shepperd John W.
Zenith Electronics Corporation
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