Television – Synchronization – Automatic phase or frequency control
Patent
1992-07-10
1994-03-15
Groody, James J.
Television
Synchronization
Automatic phase or frequency control
348704, H04N 3227
Patent
active
052949877
ABSTRACT:
A television apparatus includes a display for a video signal representing a picture. The video signal has a vertical synchronizing component defining fields of horizontal lines which can have other than a standard number of horizontal lines per field under certain operating conditions. A counter measures the number of horizontal lines in each field. A panning circuit generates a vertical reset signal which is phase shifted by a selected number of horizontal lines relative to the vertical synchronizing component of the video signal for vertically panning the picture on the video display by the selected number of horizontal lines. The selected number of horizontal lines is adjusted responsive to the measured lengths of the fields to maintain the selected amount of vertical panning even under the certain operating conditions.
REFERENCES:
patent: 3878327 (1975-04-01), Uhler
patent: 4079413 (1978-03-01), Yamashita
patent: 4163992 (1979-08-01), Inaba et al.
patent: 4249213 (1981-03-01), Imaide et al.
patent: 4581640 (1986-04-01), Cole
patent: 4679080 (1987-07-01), Bushford
patent: 4746981 (1988-05-01), Nadan et al.
patent: 4800430 (1989-01-01), Murakami et al.
patent: 4821086 (1989-04-01), McNeely et al.
patent: 4878117 (1989-10-01), Ikehira et al.
patent: 4891705 (1990-01-01), Suzuki et al.
Patent Abstracts of Japan, vol. 12, No. 474 (E-692) Dec. 12, 1988, corresponding to JP A 63-193779, Aug. 11, 1988.
Patent Abstracts of Japan, vol. 12, No. 412 (E-676) Oct. 31, 1988, corresponding to JP A 63-148780, Jun. 21, 1988.
Duffield David J.
Saeger Timothy W.
Fried Harvey D.
Groody James J.
Harvey David E.
Laks Joseph J.
Thomson Consumer Electronics Inc.
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