Method to detect the polarity of sync signals without...

Details Method to detect the polarity of sync signals without... Method to detect the polarity of sync signals without...

2005-09-20

2005-09-20

Ton, My-Trang Nu (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By polarity

Reexamination Certificate

active

06946881

ABSTRACT:
In a polarity detector circuit for detecting the polarity of monitor sync signals, a clock generator and counter circuit are provided to count clock cycles during the positive and negative portions of the signal. Comparators are used to compare the counter values to predetermined values to determine when one or both of the counters has reached a predefined value. With the proper choice of sampling clock, this digital implementation can be easily optimized for small size and simplicity.

REFERENCES:
patent: 4031532 (1977-06-01), First
patent: 4360767 (1982-11-01), Akiyama et al.
patent: 4603324 (1986-07-01), Hu
patent: 5257287 (1993-10-01), Blumenthal et al.
patent: 5297869 (1994-03-01), Benham
patent: 5831455 (1998-11-01), Chen
patent: 6285172 (2001-09-01), Torbey

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