Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1991-01-31
1992-07-14
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358167, H04N 701, H04N 5213
Patent
active
051307987
ABSTRACT:
An input filter separates a luminance input signal into a high frequency component that is noise reduced by coring and a low frequency component that is noise reduced by a frame recursive filter preceded by sub-sampling and followed by sample rate restoration by interpolation. An output circuit combines the noise reduced components to provide a processed output signal in which high frequency portions thereof are subjected to coring and low frequency portions thereof are subjected to recursive filtering. In a specific application the frame recursive filter provides a plurality of low frequency sub-sampled components which are combined with the processed output signal in a further output circuit to provide a noise reduced output signal of progressive scan form.
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Coalter Richard G.
Emanuel Peter M.
Groody James J.
Powell Mark R.
Thomson Consumer Electronics Inc.
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