H - Electricity – 04 – N
Patent
H - Electricity
04
N
H04N 5/08 (2006.01) H03L 7/199 (2006.01) H04N 5/932 (2006.01) H04N 9/64 (2006.01) H04N 9/79 (2006.01) H04N 9/89 (2006.01)
Patent
CA 2089307
ABSTRACT This specification concerns signal processing apparatus for processing line synchronization pulses in a line synchronization signal that define an analog video signal line period. The apparatus comprises a phase locked loop (40) for generating a clock signal of a frequency that is a multiple of the line synchronization signal frequency. The phase locked loop (40) comprises a counter (100) for dividing the clock signal by said multiple. The apparatus further comprises logic (110,50) for resetting the counter (100) upon detection of a spurious pulse introducing a time interval into the line synchronization signal of less than the line period of the video signal. The apparatus is particularly useful in image processing systems for digitizing analog video signals that have been replayed via a conventional, domestic video tape player, and therefore may comprise spurious line sync pulses introduced by playback head skip.
Brown David John
Conway-Jones David Charles
Rickard Thomas William
Smith Peter Martin
International Business Machines Corporation
Kerr Alexander
LandOfFree
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