Bandwidth control for chrominance and luminance paths in quadrat

Details Bandwidth control for chrominance and luminance paths in quadrat Bandwidth control for chrominance and luminance paths in quadrat

1988-04-27

1990-04-10

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 978

Patent

active

049165267

ABSTRACT:
A method is disclosed for reducing bandwidth of a chrominance path to reduce cross-color artifacts in a quadrature modulated color television signal. The method includes the steps of detecting the level of a chrominance component of the signal; developing a control signal from the detected chrominance component level; and, controlling the bandwidth of the chrominance path in accordance with the control signal so as to reduce bandwidth only when chrominance component is at a level below a predetermined threshold. The method for developing a control signal may further include the step of eliminating the sign thereof followed by a step for establishing a predetermined minimum threshold value of the absolute value chrominance level below which the control signal is not generated.

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Maxemchuk et al., Separation of NTSC Signals by Minimum Mean Square Error Filters and Adaptive Filters, IEEE Transactions on Communications, vol. COM 26, No. 5, May 1978, pp. 583-593.

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