Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1984-04-26
1987-06-02
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358148, H04N 5073
Patent
active
046707867
ABSTRACT:
Several cameras (12, 14, 16) have their composite-video outputs sent to a common switcher (24), which picks one of the outputs and sends it to a modulator (26) to be placed on a carrier and sent by antenna (28) to a central broadcast station. A central timing circuit or driver (30) sends master signals to signal-generating circuits (34, 36, 38), which receive the outputs of the cameras (12, 14, 16) and automatically adjust their output timing so that their synchronization signals are received in synchronism at the switcher (24). Timing comparators (62, 88) compare the timing of sync and subcarrier signals in the camera output with similar signals from the driver and in response control voltage-controlled oscillators (78, 104) that provide timing for the sync signals and color-burst signals that are sent to the cameras. By advancing or retarding the timing of the voltage-controlled oscillators in accordance with the relative leads or lags between the driver signals and the camera signals, the signal-generator circuits (34, 36, 38) keep the camera outputs at the switcher input ports in synchronism.
REFERENCES:
patent: 4038683 (1977-07-01), Thorpe et al.
patent: 4214261 (1980-07-01), Bazin et al.
patent: 4253116 (1981-02-01), Rogers, III
patent: 4333103 (1982-06-01), Koiwa et al.
patent: 4498103 (1985-02-01), Aschwanden
Groody James J.
Harvey David E.
QSI Systems, Inc.
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