Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1983-09-22
1986-06-24
Chin, Tommy P.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358 37, 358 39, 375 12, H04N 514
Patent
active
045970114
ABSTRACT:
A digital filter for the digital luminance channel of a color-television set contains an even number of cascaded delay elements whose junctions as well as the input and the output of the cascade serve as taps. Each of the taps of the half on the input side is connected to an input of a first switch, and each of the taps of the half on the output side is connected to an input of a second switch, such that the two switches are simultaneously set to two taps which are symmetrical with respect to a center tap. The center tap is connected to the first input of a single multiplier, whose second input is fed with a signal corresponding to a constant, and whose output is coupled to the first input of an adder. The output of the first switch and that of the second switch are connected, respectively, to the second and third inputs of the adder, whose output is the output of the subnetwork. Digital filters with at least one such subnetwork can be used as peaking filters in the luminance channel of color-television sets.
REFERENCES:
patent: 3775685 (1973-11-01), Eggimann
patent: 4231065 (1980-10-01), Fitch
Chin Tommy P.
IT&T Industries, Inc.
Lenkszus Donald J.
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