Apparatus for the digital generation of vertical synchronizing a

Details Apparatus for the digital generation of vertical synchronizing a Apparatus for the digital generation of vertical synchronizing a

1988-09-26

1989-08-15

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358153, 358154, 358158, 331 20, H04N 504, H04N 510

Patent

active

048580082

ABSTRACT:
A circuit is arranged to derive the internal vertical synchronizing signals and field identification signals for a digital television signal. The circuit operates from the internal horizontal synchronizing signals and the separated external synchronizing signals and employs a sign inverter, an accumulator, an absolute value device, a comparator, a counter and AND gates, as well as an OR gate. These components, as coupled, produce the above-noted signals by digital generation and requires no subcircuits that are independent of the horizontal oscillator which horizontal oscillator is arranged in a phase lock loop.

REFERENCES:
patent: 3485950 (1969-12-01), Reiser
patent: 4110789 (1978-08-01), Maly
patent: 4459612 (1984-07-01), Shinkai et al.
patent: 4683495 (1987-07-01), Brock
patent: 4792852 (1988-12-01), Narusawa
Patent Abstracts of Japan, Oct. 24, 1981, vol. 5, No. 167 (E-79) (839) Field Discrimination Circuit, Tokyo Shibaura Denki K.K.

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