Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1980-03-05
1981-11-03
Masinick, Michael A.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358149, H04N 504
Patent
active
042988896
ABSTRACT:
A synchronization circuit for video clock generators, wherein in order to obtain a line synchronization simultaneous with a complete image synchronization, there is provided a follow-up control which delivers a clock frequency signal. The follow-up control has its reference input connected with the output of a line pulse-separation circuit, delivering an external horizontal pulse signal, and is further connected with the input of an external complete image characteristic or marker pulse-separation circuit. Both of the separation circuits have infed at their input side a mixed pulse signal. The external complete image-characteristic pulse-separation circuit is connected at its output side with the first input of a comparator, the second input of which has infed thereto the output signal of an internal complete image characteristic pulse-separation circuit. The output signal of the comparator is infed to the first input of a regulation pulse-switch means, whose output is connected with the clock input of a clock generator, delivering to a respective output an internal mixed pulse signal and an internal horizontal pulse signal. The latter is delivered to the comparator input of the follow-up control and the first input of the internal complete image-characteristic pulse-separation circuit, the second input of which receives the internal mixed pulse signal. The output of the follow-up control is connected with the second input of the regulation pulse switch means.
REFERENCES:
patent: 3424866 (1969-01-01), Hathaway
patent: 3567861 (1971-03-01), Webb
patent: 3816658 (1974-06-01), Vidovic
patent: 4169659 (1979-10-01), Marlowe
patent: 4214261 (1980-07-01), Bazin
patent: 4220968 (1980-09-01), Scholz
Burianek Rudolf
Tschannen Gottfried
Kleeman Werner W.
Masinick Michael A.
Siemenas-Albis AG
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