Adaptive comb filter and interpolator

Details Adaptive comb filter and interpolator Adaptive comb filter and interpolator

1984-12-18

1987-02-24

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 31, H04N 978, H04N 964

Patent

active

046461337

ABSTRACT:
An adaptive comb filter and interpolator is combined with scan conversion circuitry thereby to reduce requirements for memory storage. Scan rate conversion processing of received television signals is coupled with adaptive comb filtering and interpolating to allow for all of the separate processes to be accomplished utilizing combined circuitry and a single memory using less memory storage space than the sum of the memory that the separate functions would normally require when performed at separate or discrete portions of a television receiver circuitry. A predetermined number of lines are stored in a memory and written out to combing and interpolating arithmetic logic circuitry under the control of a separate control circuit. The control circuit addresses the memory to provide for separately reading in the received digitalized video information and writing out the scan converted information to the logic circuitry for combing and interpolating. The scan rate converted, combed and interpolated chroma and luma signals are provided to the video display circuitry. The control circuit is governed by the synchronizing information of the received signal in addition to a pixel timing clock and mode control information. Two to one scan conversion for progressive scan line display is provided.

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Cohen, "Digital Processing Hikes Resolution to Sharpen TV Image", Electronics, Sep. 8, 1983.
Deubert, "Feature IC's for Digivision TV Sets", 1983 IEEE publication.
Rossi, "Digital TV Comb Filter with Adaptive Features", CBS Technology Center, 1976.

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