Video signal processing and processor taking ratio of intermediate filtered signals
AssigneeSnell & Wilcox Limited
InventorAvigdor Steinberg
Life of this patent
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Abstract
A signal processor for extracting chrominance information from a composite video signal has transversal filters developing first and second signals (A and B). A look-up table generates a control signal (C) which is a non-linear function of the ratio A/B and simultaneously develops the product B*C. A filter of this form can combine steep frequency response with minimal degradation of the response to pulses.
Claims12
A method of filtering an input video signal, comprising the steps of:
- conducting first and second filtering operations on the input:
- signal to derive respective first and second intermediate signals;
- taking a ratio of said intermediate signals to derive a control signal;
- and
- modifying the frequency spectrum of the input signal in dependence upon the control signal.
A method of video signal processing wherein a plurality of different filtering operations are conducted on an input signal to produce respective intermediate filtered signals, comprising the steps of:
- deriving a control signal as an analytical function of the intermediate signals;
- and
- modifying the frequency spectrum of the input signal in dependence upon the control signal.
A colour television signal processor for use in the separation of chrominance and luminance signals, comprising:
- first filter means producing from an input a first filtered, signal;
- signal modification means for modifying the first filtered, signal in dependence upon a control signal;
- second filter means producing from the said input a second filtered signals;
- and
- control means serving to generate said control signal by taking a ratio of the first and second filtered signals.
A method of processing a colour video signal comprising the steps of forming first and second signals representative of respective different in-phase measures of chrominance, deriving a control signal which is a non-linear function of the ratio of said first and second signals and forming the product of said control signal and said first signal.
Dependencies are inferred from the claim text.