Television – Synchronization – Automatic phase or frequency control
Patent
1995-12-12
1998-12-01
Chin, Tommy P.
Television
Synchronization
Automatic phase or frequency control
348516, 348531, 386 12, 386 84, H04N 505
Patent
active
058446222
ABSTRACT:
The invention pertains to a digital video horizontal synchronization pulse detector and processor comprising pulse detector for generating a timing pulse in response to each horizontal synchronization pulse. A sync position error device generates a time position error signal for each timing pulse relative to a corresponding window pulse. A window pulse generator generates the window pulses and limits the time position error signals to a maximum value. An acquisition device tracks when the timing pulses occur inside and outside the corresponding window pulses. An averaging device averages the time position error signals to generate an average error signal. A counter phase locks to the timing pulses to generate processed horizontal sync pulses such that when the timing pulses occur within the corresponding window pulses the counter is adjusted by the average error signal and when a predetermined number of timing pulses occur outside the corresponding window pulses, the counter is loaded with a predetermined value during a timing pulse to align the timing pulses with the corresponding window pulses.
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Chin Tommy P.
Le Vu
TRW Inc.
Yatsko Michael S.
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