Spatial filter for improved VHS system

Details Spatial filter for improved VHS system Spatial filter for improved VHS system

1992-05-11

1993-12-28

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358335, 358141, 358 12, 358310, 358328, 358330, 360 331, H04N 576

Patent

active

052744647

ABSTRACT:
A television signal having a luminance spectrum extending from zero to f.sub.h in horizontal spatial frequencies and from zero to f.sub.v in vertical spatial frequencies is recorded on a video tape. A folded-spectrum signal is generated for recording by modulating the luminance signal onto a folding carrier of (f.sub.h /2, f.sub.v /2) complex spatial frequency. This is done by heterodyning the luminance signal with a folding carrier wave and then selecting as said folded-spectrum signal only the baseband portion of the resulting signal. At least when there is change between successive television images, the luminance signal is pre-filtered by a low-pass spatial filter that separates the two-dimensional image spectral domain into a pass band region and into an attenuation band region. Each point in the passed region has a corresponding mirror point in the attenuated region as mirrored about a complex spatial frequency (f.sub.h /4, f.sub.v /4) in both horizontal and vertical directions. During subsequent playback the folded-spectrum signal recovered from the tape is unfolded by heterodyning it with the folding carrier wave and selecting only the baseband portion of the resulting signal. At least when there is change between successive television images, the unfolded-spectrum signal is passed through a low-pass spatial reconstruction filter similar to that used as a recording pre-filter, and accompanying aliases are attenuated by the reconstruction filter.

REFERENCES:
patent: 2716151 (1955-08-01), Smith
patent: 4831463 (1989-05-01), Faroudja
patent: 4868654 (1989-09-01), Juri et al.
Software and Hardware Applications of Microcomputer, Publication of the International Society for MINI and Microcomputers-ISMM, Editors: M. H. Hamza and Lee.

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