Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1981-08-31
1983-11-15
Murray, Richard
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 21R, H04N 950
Patent
active
044159188
ABSTRACT:
A digital filter arrangement is provided which both demodulates and filters the color mixture signals in a television receiver. Samples of a digital chrominance signal are clocked into first and second registers such that the first register is loaded with samples of a first color mixture signal and the second register contains samples of a second color mixture signal. Output taps are connected between various ones of the stages of the first and second registers and weighting function circuits. The weighting function circuits associated with each register are in turn coupled to respective ladder networks of adders, which combine the weighted signals samples so as to exhibit, at an output stage adder, a lowpass response characteristic which is appropriate for the respective color mixture signal. The two digital registers are aligned in time in accordance with their respective peak impulse response characteristic to product filtered color mixture signals in a proper timed relationship.
REFERENCES:
patent: 4270139 (1981-05-01), Flamm et al.
patent: 4307414 (1981-12-01), Lee
patent: 4333104 (1982-01-01), Geller
patent: 4344040 (1982-08-01), Reilly et al.
Article "Color Decoding a PCM NTSC Television Signal" by J. P. Rossi, Jun. 1974 Journal of the SMPTE vol. 83, No. 6, pp. 489-495.
Article "Digital Television Image Enhancement" by J. P. Rossi, 1975 Journal of the SMPTE, vol 84, at pp. 545-551.
Text "Theory and Application of Digital Signal Processing" by Rabiner and Gold (Prentice-Hall, 1975), p. 550.
Paper "Nonrecursive Digital Filters With Coefficients of Powers of Two" by A. Tomozawa, in the IEEE Int'l. Conf. on Comm., pp. 18D-1 through 18D-5.
Paper "Colour Demodulation of an NTSC Television Signal Using Digital Filtering Techniques" by A. G. Deczky, 1975 IEEE Int'l. Conf. on Comm., vol. II, pp. 23-6 through 23-11.
Berard, Jr. C. A.
Murray Richard
Rasmussen P. J.
RCA Corporation
Whitacre E. M.
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