H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/1
H04N 17/02 (2006.01)
Patent
CA 1256196
1 Abstract: The present invention relates to an instrument for use in indicating subcarrier to horizontal sync (SC/H) phase of a composite video signal. The instrument is comprised of a display device for providing a polar display, including a unit for generating from a reference subcarrier burst of the video signal a first input signal for the display device such as to cause the display device to display an indication at a predetermined angular position of the polar display. The instrument further comprises a phase determining and indicating unit for determining a time difference between a sync point and that zero crossing of the extrapolated subcarrier wave which is closest to the sync point and for generating from the time difference a second input signal for the display device such as to cause the display device to display an indication at a position of the polar display that is angularly spaced from a pre- determined axis of the polar display by an angle given by the fraction having as its denominator the period of the reference subcarrier wave and as its numerator the product of the time difference and 360 degrees.
562865
Kirby Eades Gale Baker
Tektronix Inc.
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