Apparatus for synchronization of a source of computer controlled

Details Apparatus for synchronization of a source of computer controlled Apparatus for synchronization of a source of computer controlled

1980-06-16

1982-08-24

Masinick, Michael A.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358148, 340814, H04N 504

Patent

active

043464076

ABSTRACT:
Synchronization of a source of computer controlled video to another video source is achieved by providing clock pulses for the source of computer controlled video at some multiple of the horizontal synchronization frequency of the other video source to obtain frequency coherence and by detecting phase incoherence between the signals from the two sources and in response thereto causing the clock pulses to cease for a predetermined period to allow the source of computer controlled video to "slip" sync to obtain phase coherence.

REFERENCES:
patent: 4011401 (1977-03-01), Presti
patent: 4018990 (1977-04-01), Long
patent: 4092672 (1978-05-01), Aschwanden
patent: 4157572 (1979-06-01), Kennedy
patent: 4203135 (1980-05-01), Sasaki
patent: 4222074 (1980-09-01), Breithaupt
patent: 4270125 (1981-05-01), Weisbecker
"The Tifax XMII Teletext Decoder", Norris & Garrard Texas Instrument.
"Video Effects Generator", Television, Apr. 1978, Parr, pp. 294-297.

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