Sampled color difference signal processing system having a quadr

Details Sampled color difference signal processing system having a quadr Sampled color difference signal processing system having a quadr

1984-07-16

1986-10-07

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 1114

Patent

active

046162526

ABSTRACT:
A system is described in which the audio subcarrier components are attenuated relative to the other components of composite television signals by an inexpensive IF filter. This filter incidentally produces quadrature distortion between the two color difference signal components of the composite television signals. The disclosed invention includes a differentiator, responsive to at least one of the color difference signals, that derives signals proportional to the quadrature distortion components present in the other color difference signal. These distortion components are then subtracted from the other color difference signal to produce a signal that is substantially free of quadrature distortion. The differentiator and subtracter are advantageously realized in the form of a simple FIR filter.

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Stein, S. Schwartz, M. S. & Bennet, W. R., Communications Systems and Techniques, McGraw Hill, 1966, pp. 29-38.
Bailey, W. F. & Hirsch, C. J., "Quadrature Crosstalk", Proceedings of the IRE, Jan. 1954, pp. 84-90.

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