Video signal sampling circuit and an image display apparatus inc

Details Video signal sampling circuit and an image display apparatus inc Video signal sampling circuit and an image display apparatus inc

1998-09-02

2000-12-26

Lee, Michael

Television

Synchronization

Automatic phase or frequency control

348572, H04L 700

Patent

active

061667757

ABSTRACT:
A video signal sampling circuit searches the optimum sampling frequency and phase of the sampling clock signal by detecting level changing points in the sampled video signal in the horizontal direction with the sampling frequency varied every predetermined phase. The saturated maximum count of the level changing point provides the optimum sampling frequency and optimum phase of the sampling clock signal. The video signal sampling circuit automatically sets the optimum sampling frequency and phase of the sampling clock signal in accordance with the result of searching. The video display including the video signal sampling circuit is also disclosed.

REFERENCES:
patent: 4757264 (1988-07-01), Lee et al.
patent: 4943857 (1990-07-01), Izuno et al.
patent: 5396295 (1995-03-01), Furuta
patent: 5528307 (1996-06-01), Owada et al.
patent: 5539473 (1996-07-01), Kommrusch et al.
patent: 5731843 (1998-03-01), Cappels, Sr.

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