Television – Synchronization – Phase locking regenerated subcarrier to color burst
Patent
1995-12-12
1998-06-16
Chin, Tommy P.
Television
Synchronization
Phase locking regenerated subcarrier to color burst
348539, 348549, H04N 945
Patent
active
057679150
ABSTRACT:
A digital color burst phase switch for determining phase shift of a color burst signal in a PAL video signal includes a phase selector for selecting either a first reference clock or a second reference clock in response to a PAL switch signal. A phase delay device delays the phase of either the first reference clock or the second reference clock selected by the phase selector to generate a third reference clock. A phase comparator compares the phase of the third reference clock to the phase of the color burst signal to generate a control signal. The control signal is integrated over substantially the entire color burst signal to generate an integration value. This integration value is compared to a threshold value in a threshold device to generate a correction signal. A PAL switch generator generates the PAL switch signal in response to the correction signal such that the phase selector selects either the first reference clock or the second reference clock having a phase substantially corresponding to the phase of the color burst signal.
REFERENCES:
patent: 3878557 (1975-04-01), Vidovic
patent: 3900885 (1975-08-01), Tallent et al.
patent: 4024572 (1977-05-01), Derenbecher, Jr.
patent: 4268853 (1981-05-01), Nakamura et al.
patent: 4339770 (1982-07-01), Dennison et al.
patent: 4389663 (1983-06-01), Tatami
patent: 4463371 (1984-07-01), Lewis, Jr.
patent: 4466022 (1984-08-01), Ota
patent: 4477847 (1984-10-01), Knight et al.
patent: 4504862 (1985-03-01), Achtstaetter
patent: 4506286 (1985-03-01), Kashigi
patent: 4598310 (1986-07-01), Brand et al.
patent: 4605953 (1986-08-01), Wilkinson et al.
patent: 4663654 (1987-05-01), Morrison
patent: 4697207 (1987-09-01), Lilley
patent: 4769691 (1988-09-01), Dischert
patent: 4878128 (1989-10-01), Yasumura et al.
patent: 5053862 (1991-10-01), Phillips et al.
patent: 5243412 (1993-09-01), Goukura et al.
patent: 5253042 (1993-10-01), Yasuda
patent: 5311296 (1994-05-01), Ikefuji et al.
patent: 5499375 (1996-03-01), Miyaguchi
Chin Tommy P.
Lee Y.
TRW Inc.
Yatsko Michael S.
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