Digital correlation indicator and hanging dot reduction system e

Details Digital correlation indicator and hanging dot reduction system e Digital correlation indicator and hanging dot reduction system e

1985-04-18

1986-10-21

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 36, 358105, 328162, H04N 964, H04N 718

Patent

active

046188827

ABSTRACT:
In a color TV receiver, a first digital signal of "m" bits represents high frequency component of combed luminance signal, and a second digital signal of "m" bits represents combed chrominance component. The "k" most significant bits of the first signal (where "k" is less than "m") are fed to respective inputs of a first "or" gate, while the "j" most significant bits of the second signal (where "j" is less than, or equal to, "m") are fed to respective inputs of a second "or" gate. The "or" gate outputs are fed, without delay difference, to inputs of a first "and" gate, and are fed, with a delay difference of 90.degree. at color subcarrier frequency, to inputs of a second "and" gate. Sequence recognition apparatus, responsive to the outputs of both "and" gates, develops a correlation indication in response to existence of predetermined sequences of outputs from one or both "and" gates. Control signal former, responsive to correlation indication, forms control signal for actuating high frequency component suppression in receiver's luminance channel to preclude hanging dot display.

REFERENCES:
patent: 4050084 (1977-09-01), Rossi
patent: 4214263 (1980-07-01), Kaiser
patent: 4241363 (1980-12-01), Maeyama et al.
patent: 4340940 (1982-07-01), Williams et al.
patent: 4500911 (1985-02-01), Ninomiya et al.
"Comb Filter Improvement with Spurious Chroma Deletion"--Kaiser; pp. Jan. 1-5, 5, 1977, SMPTE Journal (vol. 86, No. 1).

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