Relative channel delay measurement

Details Relative channel delay measurement Relative channel delay measurement

2007-02-20

2007-02-20

Lee, Michael H. (Department: 2622)

Television

Monitoring, testing, or measuring

C348S192000, C348S520000, C324S076330

Reexamination Certificate

active

10780785

ABSTRACT:
A method of measuring relative channel delay between components of a video signal includes removing a local mean from each of the pair of input component signals and cross-correlating the resulting pair of input component signals. A mean is removed from the cross-correlation and a centroid for the cross-correlation is found within a region bound by nearest zero-crossing to a peak in the cross-correlation. The centroid is then converted to a delay time as a function of sample rate after removing a sample offset. Also a normalized peak value of the cross-correlation provides a figure of merit for the probable accuracy of the delay measurement.

REFERENCES:
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patent: 4792846 (1988-12-01), Penny
patent: 4829366 (1989-05-01), Penney
patent: 5265121 (1993-11-01), Stewart
patent: 6272168 (2001-08-01), Lomp et al.

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