Video timing display indicator

Details Video timing display indicator Video timing display indicator

2007-06-19

2007-06-19

Yenke, Brian P. (Department: 2622)

Television

Monitoring, testing, or measuring

Monitor

C348S180000, C348S181000, C348S185000, C702S067000, C702S068000, C702S069000, C702S071000

Reexamination Certificate

active

10931538

ABSTRACT:
A timing alignment or offset display shows the relationship between a reference signal and a test signal, in particular two analog or digital video signals. Timing extraction circuits derive a lower frequency signal synchronized to horizontal lines and a higher frequency signal synchronized to the pixel sampling rate. A reference time pulse is also derived from the reference signal. Two offsets are counted by determining a line count and a sample or clock cycle count between corresponding reference points in the test and reference signals. A coarse line count offset and a fine timing offset are thereby obtained and are displayed by movable markers on opposite sides of a scale line. The markers are centering and aligned when the frame/field alignment and the color and/or sample portions of the signals correspond in time. Tabular data, distinct coloring and alarms also are depicted.

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TEKTRONIX, Inc., Technical Brief (Facility Timing Made Easy), website www.tektronix.com/video—audio, U.S. Copyright 2003.

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