Adaptive-type luminance/color signal separation circuit using th

Details Adaptive-type luminance/color signal separation circuit using th Adaptive-type luminance/color signal separation circuit using th

1987-12-30

1989-04-04

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 37, H04N 978

Patent

active

048190624

ABSTRACT:
The technique for separating luminance(Y)/color(C) signals in NTSC-type television TV receivers is disclosed. To decrease deterioration in picture quality due to inaccuracy of Y/C signal separation in color television receivers, comb filters have been used and a three-dimensional signal processing technique using a frame memory has recently been disclosed. To avoid a complicated constitution of circuit which consists in the necessity of large scale memory, this invention provides a Y/C signal separating circuit suitable for digitalization without increasing the complication of circuit by using a line memory. Also, horizontal and vertical peaking filters utilizing horizontal and vertical correlation of video signals in said separating process are provided to change the bandwidth of the filter according to signals, thereby improving in resolution and S/N ratio.

REFERENCES:
patent: 4609938 (1986-09-01), Suzuki et al.
patent: 4706113 (1987-11-01), Ito et al.
Baldwin et al., Spatial Filters, IBA Technical Review, No. 8, Sep. 1976, pp. 41-48.

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