Prompter eliminating phase shift in sub-carriers

Details Prompter eliminating phase shift in sub-carriers Prompter eliminating phase shift in sub-carriers

1997-03-04

2000-08-15

Kostak, Victor R.

Television

Studio equipment

348375, 348910, 348527, H04N 5222

Patent

active

061044407

ABSTRACT:
The image signal processing apparatus for a prompter is intended to improve ease in viewing an image when using clock frequencies synchronized to the sub-carriers of the four-field sequence. That is, the sub-carriers with different phases are separated from the video signal, in-phase clock signals from which phase shift in the sub-carriers is eliminated are generated by a timing signal generator circuit, and image data in all four fields are processed with the clock signals. This reduces flickering on the screen. The timing signal processing circuit may generate in-phase clock signals for odd fields and in-phase clock signals for even fields, and shift the phase between them by 180.degree. so that pixels in an oblique direction are obliquely aligned with half pixel shift between both clock signals. This is particularly effective for an oblique line.

REFERENCES:
patent: 3990107 (1976-11-01), Hanma et al.
patent: 4660107 (1987-04-01), Chippendale, Jr.
patent: 4788540 (1988-11-01), Tokumitsu
patent: 4894722 (1990-01-01), Suzuki
patent: 5715019 (1998-02-01), Yata
patent: 5721586 (1998-02-01), Shimamura et al.
patent: 5790194 (1998-08-01), Shimamura

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