Image data processing apparatus

Details Image data processing apparatus Image data processing apparatus

1997-07-30

1999-12-28

Peng, John K.

Television

Synchronization

Automatic phase or frequency control

348536, 348505, 348663, 348194, 331 20, 331 18, H04N 945, H03L 700

Patent

active

060088591

ABSTRACT:
An image data processing apparatus is described that prevents the period of a horizontal timing signal from being shifted. The apparatus includes a separator, a phase-locked loop, a detector, a compensator and a timing signal generator. The detector delays a reference clock signal in a shorter period than the period of the reference clock signal, in a step-like manner, to produce a plurality of delayed timing signals having step-like phase differences. The detector further contrasts the plurality of delayed timing signals with a horizontal sync signal and the reference clock signal to measure the phase difference and the period of the horizontal sync signal. The compensator sets a ratio for combining consecutive luminance data in accordance with the phase difference and the period of the reference clock signal and combines consecutive luminance data in accordance with the ratio to generate compensated luminance data. The timing signal generator frequency-divides the reference clock signal in response to the horizontal sync signal to generate a timing signal for a horizontal scan.

REFERENCES:
patent: 4212027 (1980-07-01), Lemoine
patent: 4251831 (1981-02-01), Kamah
patent: 4688081 (1987-08-01), Furuhata
patent: 5841486 (1998-11-01), Ando

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