Television – Synchronization – Automatic phase or frequency control
Patent
1997-02-21
2000-09-05
Lee, Michael H.
Television
Synchronization
Automatic phase or frequency control
348571, 375371, H04N 506
Patent
active
061150754
ABSTRACT:
The present invention provides a technique for appropriately adjusting a dot clock for video signals by a simple process. A process of adjusting a phase of the dot clock first obtains two image data by two dot clocks having different phases, carries out a certain operation for the two image data to calculate a phase-related index representing the relative phase of the dot clock to a video signal with respect to the two image data, and determines a delay that gives a desirable phase to the dot clock based on these phase-related indexes. A first process of adjusting the frequency of the dot clock first obtains image data by a dot clock that has been generated with a provisional factor, calculates a length of an effective signal area on one line of the image data, and determines a desirable factor based on the ratio of a known length to the measured length of the effective signal area. A second process of adjusting the frequency of the dot clock extracts a beat component included in the sampled image data to determine the difference between a provisional factor and a desirable factor.
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IBM Technical Disclosure Bulletin, vol. 37, No. 5, pp. 203 and 204, "Automatic Phase Adjustment", May 1994.
IBM Technical Disclosure Bulletin, "Automatic Phase Adjustment," vol. 37, No. 5, May, 1994, p. 203.
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Lee Michael H.
Lo Linus H.
Seiko Epson Corporation
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