Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1978-01-19
1980-05-13
Griffin, Robert L.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358 19, H04N 504, H04N 946
Patent
active
042031354
ABSTRACT:
A synchronizing signal generator wherein a frequency reference oscillator is phase controlled using an external subcarrier signal as a reference signal, and a frequency divider for frequency dividing the output of the reference oscillator is adapted to be reset responsive to an external synchronizing signal, whereby the said synchronizing signal generator is externally synchronized, characterized in that the said external synchronizing signal and an internal synchronizing signal generated in the said synchronizing signal generator are phase compared and resetting of the frequency divider by the said external synchronizing signal is disabled responsive to the coincidence of the phases of these external and internal synchronizing signals.
REFERENCES:
patent: 3588351 (1971-06-01), Baum
patent: 3935388 (1976-01-01), Brinkmann
patent: 4038683 (1977-07-01), Thorpe et al.
patent: 4059842 (1977-11-01), Meacham
Synchronisation of Remote Sources; ABU Technical Rev. No. 37, (Japan); Mar. 1975.
Griffin Robert L.
Psitos Aristotelis M.
Sanyo Electric Co,. Ltd.
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