Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1991-08-09
1992-09-01
Britton, Howard W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
324121R, H04N 1700
Patent
active
051444305
ABSTRACT:
A sync separator separates vertical, field and horizontal synchronization signals from a video signal processed by a circuit under test which exhibits an artifact in the video. The cause of the artifact in the circuit under test is to be located using an oscilloscope. A line select circuit includes a delay responsive to the separated vertical and field signals for generating a marker signal and for positioning the marker signal via observation of the display produced by video signal under test. A trigger signal and marker generator refines the marker signal by causing the boundaries of the marker signal to coincide with corresponding horizontal sync pulses and produces an oscilloscope trigger signal having a transition which is formed by one of those boundaries. A combiner circuit combines the refined marker signal with the video signal under test for display so that the marker signal via the delay can be positioned on a region of interest in the video display. The trigger signal triggers the oscilloscope so that the oscilloscope displays the portion of the video defined by the so positioned marker signal.
REFERENCES:
patent: 3742132 (1973-06-01), Olsson
patent: 3798366 (1974-03-01), Hunt
patent: 4743845 (1988-05-01), Diller
patent: 4763067 (1988-08-01), Fladstol
Britton Howard W.
North American Philips Corporation
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