Structure and method for detecting phase errors in the horizonta

Details Structure and method for detecting phase errors in the horizonta Structure and method for detecting phase errors in the horizonta

1991-12-03

1993-11-30

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358158, 358319, H04N 504

Patent

active

052670406

ABSTRACT:
A method and a structure are provided to detect phase errors in horizontal synchronization pulses of video signals. A detected phase error is used to provide a phase correction for each horizontal line of the video image. In one embodiment, the phase correction is provided by a digital filter which takes into account systematic and random components of the phase error. In addition, the phase correction also takes into account accumulated round-off errors in the digital filter itself. A random number generator in the digital filter randomizes the correction for accumulated round-off errors. The phase correction is made smaller than the phase error so as to prevent jittering in the resulting picture.

REFERENCES:
patent: 4498103 (1985-02-01), Aschwanden
patent: 4672448 (1987-06-01), Gioiosa
patent: 4679005 (1987-07-01), Tatami
patent: 4680621 (1987-07-01), Baker et al.
patent: 4791488 (1988-12-01), Fukazawa et al.
patent: 4847678 (1989-07-01), McCauley
patent: 5157492 (1992-10-01), Tults

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