Digital circuit for steepening color-signal transitions

Details Digital circuit for steepening color-signal transitions Digital circuit for steepening color-signal transitions

1986-04-18

1988-03-01

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 40, H04N 9064

Patent

active

047290145

ABSTRACT:
This circuit arrangement is designed for use in digital color-television receivers or the like and contains for each of the two digital color-difference signals a slope detector to which both a digital signal defining an amplitude threshold value and a digital signal defining a time threshold value are applied. At least one intermediate value occurring during an edge to be steepened is stored, and at the same time value of the steepened edge, it is "inserted" into the latter. This is done by means of memories switches, output registers, and a sequence controller.

REFERENCES:
patent: 4281347 (1981-07-01), Tschannen
patent: 4414564 (1983-11-01), Hitchcock
patent: 4542475 (1985-09-01), Acampora
patent: 4581631 (1986-04-01), Sonnenberger
Thomas Fischer, "Digital VLSI Breeds Next-Generation TV Receivers", Electronics, vol. 54, No. 16, Aug. 11, 1981, pp. 97-103.
Klaus Juhnke, "Four Standard Colour Decoder with Picture Improvement", IEEE Transactions on Consumer Electronics, vol. CE-19, No. 4, Nov. 1983, pp. 451-461.
VALVO Publications: "Technische Information 840228 (Feb. 28, 1984): Versteilerung von Farbsignalsprungen and Leuchtdichtesignal-Verzogerung mit der Schaltung TDA 4560".

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