Hanging dot reduction system

Details Hanging dot reduction system Hanging dot reduction system

1985-04-18

1986-10-07

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

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358 36, H04N 964

Patent

active

046162542

ABSTRACT:
Control signal generator is responsive to the output of a pair of correlation indicators. One correlation indicator provides an indication of the presence or absence of correlation between high frequency components derived without difference in delay from the respective luminance and chrominance outputs of a color TV receiver's comb filter system. The other correlation indicator provides an indication of the presence or absence of correlation between high frequency components derived with a difference in delay from the respective comb filter outputs, the delay difference corresponding to a quarter period at the nominal color subcarrier frequency. Control signal is developed in response to a correlation indication by either or both of the indicators. The luminance output of the comb filter is subjected to high frequency component removal during control signal development.

REFERENCES:
patent: 4050084 (1977-09-01), Rossi
patent: 4072984 (1978-02-01), Kaiser
patent: 4167021 (1979-09-01), Holmes
patent: 4178609 (1979-12-01), Beutel
patent: 4241363 (1980-12-01), Maeyama et al.
patent: 4307413 (1981-12-01), Takeuchi et al.
patent: 4389665 (1983-06-01), Nagao et al.
patent: 4513311 (1985-04-01), Hirai et al.
patent: 4570177 (1986-02-01), Kondo et al.
John Rossi, "Digital TV Comb Filter with Adaptive Features", Conference & Proceedings of the Conference on Video and Data, Birmingham, England (Jul. 20-22, 1976), pp. 267-282.
"Comb Filter Improvement with Spurious Chroma Deletion"--Kaiser; pp. 1-5, Jan. 1977 SMPTE Journal (vol. 86, No. 1).

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