Color television system having adaptive filters in the transmitt

Details Color television system having adaptive filters in the transmitt Color television system having adaptive filters in the transmitt

1990-04-30

1992-04-07

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 16, H04N 978

Patent

active

051032961

ABSTRACT:
A color television system wherein the transmitter and receiver each include at least one adaptive filter for minimizing crosstalk between the frequency interleaved luminance (Y) and chrominance (C) components of a received video signal due to vertical changes in luminance or chrominance on successive scanning lines of the video picture. Each such adaptive filter includes a line comb filter which comb-filters from the input signal thereto frequencies which belong to one of the video signal components, and a fading circuit for combining the comb-filtered signal with the unfiltered signal in continuously variable relative proportions. Such proportioning is established by an adaptive control signal derived from a vertical detection signal which corresponds to the degree of vertical correlation of luminance and/or chrominance of vertically corresponding pixels on successive scanning lines. Crosstalk between the luminance and chrominance signals is thereby minimized consistent with retention of high frequency components thereof which provide fine detail in the video picture.

REFERENCES:
patent: 4345268 (1982-08-01), Clarke
patent: 4656502 (1987-04-01), Hansdorfer
patent: 4688080 (1987-08-01), Wagner
patent: 4754322 (1988-06-01), Okuda et al.
patent: 4893176 (1990-01-01), Faroudja
A Progress Report on Improved NTSC, Faroudja et al, SMPTE Journal, Nov. 1989, pp. 817-822.

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