Decoding composite PAL television signals

Details Decoding composite PAL television signals Decoding composite PAL television signals

1981-01-21

1982-08-03

Martin, John C.

Facsimile and static presentation processing

Static presentation processing

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358 31, H04N 9535

Patent

active

043430171

ABSTRACT:
A composite PAL television signal decoder comprises a first delay device for delaying an input PAL television signal A by one horizontal line scan period minus one quarter of a period of the color sub-carrier signal to produce a first delayed signal B, a second delay device for delaying the signal A by one half of a period of the color sub-carrier signal to produce a second delayed signal C, a third delay device for delaying the signal C by one horizontal line scan period minus one quarter of a period of the color sub-carrier signal to produce a third delayed signal D, means to derive a luminance component Y as one half (A+D), means to derive a chrominance component U as one quarter (B+D) minus one quarter (A+C), and means to derive a chrominance component V as one quarter (C+D) minus one quarter (A+B).

REFERENCES:
patent: 3707596 (1972-12-01), Kuhn
Auty et al., "Colour Picture Improvement Using Simple Analog Comb Filters", BBC Engineering, Dec. 1977, No. 108, pp. 28-33.

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