Television – Synchronization – Automatic phase or frequency control
Reexamination Certificate
2005-07-12
2005-07-12
Yenke, Brian P. (Department: 2614)
Television
Synchronization
Automatic phase or frequency control
C348S180000, C348S512000
Reexamination Certificate
active
06917388
ABSTRACT:
In a video signal processing device, an input video signal VO representing a test pattern having two gradations of black and white is converted to 8-bit data by an A/D converter4in synchronism with sampling clocks generated in a write-in control circuit5, and then stored in a memory6. An MPU9reads out picture element data in an effective area of the video signal stored in the memory6, and calculates the difference AT between the average value of white-level picture element data whose values are larger than a predetermined value and the average value of black-level picture element data whose values are smaller than a predetermined value, and the total variance VT between the variance of the white-level picture element data and the variance of the black-level picture element data. The MPU9controls the phase of the sampling clocks generated in the write-in control circuit5so that the AT is maximum and the VT is minimum. With this operation, the sampling phase can be automatically adjusted to the optimum value when the video signal is converted to digital data.
REFERENCES:
patent: 4468703 (1984-08-01), Fujiwara et al.
patent: 5255330 (1993-10-01), Huynh et al.
patent: 5315409 (1994-05-01), Matsumura et al.
patent: 5359366 (1994-10-01), Ubukata et al.
patent: 5990968 (1999-11-01), Naka et al.
patent: 6181335 (2001-01-01), Hendricks et al.
patent: A 63-141471 (1988-06-01), None
patent: A 63-292886 (1988-11-01), None
patent: A 3-97376 (1991-04-01), None
patent: A 5-211442 (1993-08-01), None
Japanese Office Action dated Oct. 5, 2004.
Iwanaga Masaaki
Maruyama Atsushi
Naka Kazutaka
Urata Hiroyuki
Hitachi , Ltd.
Kenyon & Kenyon
Yenke Brian P.
LandOfFree
Video signal processing device for automatically adjusting... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Video signal processing device for automatically adjusting..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Video signal processing device for automatically adjusting... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3433272