Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1990-05-10
1991-10-22
Kostak, Victor R.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 36, H04N 964
Patent
active
050600567
ABSTRACT:
A luminance signal/color signal separating circuit comprises a comb filter for Y/C separation. The addition output of the comb filter comprises a luminance signal component, while the subtraction output comprises a color signal component and non-correlation components of a luminance signal. The non-correlation components in the subtraction output are extracted by a trap circuit and added to the addition output of the comb filter. Accordingly, the degradation of vertical direction resolution of reproduced signal will be prevented. Also, under some circumstances, the extracted non-correlation components are previously enhanced before being added to the luminance signal. The noise reduction circuit in reproduction mode shares the above comb filter for color signal separation. When dropout occurs, the color signal in the output of the 1H delay circuit of the comb filter is inverted and separated to be used as a drop out compensation signal.
REFERENCES:
patent: 3764739 (1973-10-01), Faroudja
patent: 4186411 (1980-01-01), Numakura
patent: 4858004 (1989-08-01), Kitagaki et al.
Ichikawa Yuuichi
Miki Shigeru
Shirai Mitsuzou
Kostak Victor R.
Sanyo Electric Co,. Ltd.
Vu Kim Yen
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