System for filtering color television signals utilizing comb fil

Details System for filtering color television signals utilizing comb fil System for filtering color television signals utilizing comb fil

1988-04-20

1989-07-18

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 23, 358 35, H04N 540, H04N 965

Patent

active

048498084

ABSTRACT:
In the generation of NTSC color television signals, the luminance signal and the color difference signals are pre-filtered along the vertical picture axis. Full bandwidth luminance is pre-filtered by combining, with appropriate coefficients, signals from three adjacent television lines, and, additionally, a vertical detail signal is generated by combining the same three adjacent television lines, with difference coefficients, and low pass filtering the resultant signal. A desired adjustable level of the vertical detail signal is added back into the pre-filtered full bandwidth luminance signal to partially or fully cancel the effect at the lower frequencies of pre-filtering the luminance signal. Time multiplexed color difference signals at baseband are prefiltered by combining with appropriate coefficients, the signals from three adjacent television lines. The prefiltering operation is translated to the conventional NTSC chrominance band by the color modulation process. The processed chrominance signal is added to the processed luminance signal to obtain an NTSC color television signal.

REFERENCES:
patent: 4050084 (1977-09-01), Rossi
patent: 4731660 (1988-03-01), Faroudja et al.
patent: 4750033 (1988-06-01), Fukuda et al.
"Some Thoughts on Using Filters in the Broadcast Television Transmitter and at the Receiver", Rudolf Turner, IEEE Trans. on Consumer Electronics, vol. CE-23, No. 3, Aug. 1977, pp. 248-257.
Y. Faroudja and J. Roizen, "Improving NTSC to Achieve Near-RGB Performance" SMPTE Journal, Aug. 1987, vol. 6, No. 8, pp. 750-761.
J. P. Rossi, "Optimizing The Encoding Process to Overcome the Major Defects of NTSC Color Pictures," presented at 129th SMPTE Technical Conf., Oct. 31-Nov. 4, 1987, SMPTE Preprint No. 129-92, pp. 1-15.

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