Methods and apparatus for reducing the color noise of a television signal using a limiter with transfer function
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United States of America Patent
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Aug 31, 1993
Grant Date -
N/A
app pub date -
Aug 26, 1991
filing date -
Aug 30, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An arrangement and method for reducing the noise component of a television picture chrominance signal, using a vertical digital filter. A noise-reduced reference signal is formed from the chrominance signals of vertically preceding lines. A difference signal is derived, wherein the noise-reduced reference signal, entering into the calculation of the difference signal, is created by the recursive signal processing operations of the digital filter. The transversal signal-processing operations of the digital filter affects the reduction of the noise component. The difference signal, before passing through the recursive and transversal signal-processing operations, is applied to a limiter. The limiter introduces an amplitude-dependent attenuation to obtain a modified difference signal. The modified difference signal enters into the recursive and transversal signal-processing operations instead of the original difference signal.
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