Removal of the folding carrier and sidebands from an unfolded vi

Details Removal of the folding carrier and sidebands from an unfolded vi Removal of the folding carrier and sidebands from an unfolded vi

1990-08-06

1995-07-04

Groody, James J.

Television

Image signal processing circuitry specific to television

Noise or undesired signal reduction

348571, H04N 700

Patent

active

054304970

ABSTRACT:
Apparatus is disclosed for processing video information which is reproduced from a magnetic recording medium in a video cassette recorder. The luminance portion of the video signal, which is "folded" about a sampling frequency carrier before recording on magnetic tape, is unfolded after being read from the magnetic tape to restore the bandwidth of the signal, and is applied in parallel through horizontal and vertical comb filters. The combined output of the horizontal comb filter and the vertical comb filter may include incompletely cancelled horizontal and vertical components of the folding frequency and sidebands due to the effects of picture contents. An edge detector receptive to the unfolded video signal responds to an encountered brightness edge, and generates a signal which varies the proportions of the video outputs of the horizontal and vertical comb filters in the combined output.

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Couturier, Guy D. "Sobel Edge Extraction Circuit" Air Force technical disclosure May 1981.
Patent Abstract of Japan, vol. 11, No. 209, (E-521), 7 Jul. 1987, JP-A-62-029,392.

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