Digital comb filtering for PAL television signals

Details Digital comb filtering for PAL television signals Digital comb filtering for PAL television signals

1980-07-16

1983-08-16

Richardson, Robert L.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 35, 358 36, 358 40, H04N 9535

Patent

active

043994547

ABSTRACT:
A method and apparatus for comb filtering a PAL type television signal is described. Preferably, the television signal is digitized by sampling it at an even multiple of its chroma subcarrier frequency, thereby to convert the television signal to a series of digital signals representative of discrete picture elements. The value of each such digital signal is indicative of the value of the luminance component and the value of the amplitude and phase of the chroma component of its associated picture element. The phase of the chroma component of a reference picture element is changed by combining and averaging stored digital signals associated with selected picture elements whose chroma component is of the desired phase and which, in combination, cancel out luminance components. Preferably, a resultant luminance signal is also generated by combining and averaging stored digital signals associated with selected picture elements so as to cancel out their chroma components, and the resultant luminance signal is combined with the phase-changed chroma signal to develop a final signal whose chroma component is of the desired phase.

REFERENCES:
patent: 4064530 (1977-12-01), Kaiser et al.
patent: 4075655 (1978-02-01), Iijima et al.
patent: 4096516 (1978-06-01), Pritchard
patent: 4178609 (1979-12-01), Beutel
Wachs, "Zur Anwendung Digitaler Nichtrekursiver Filter", Nachrichten Elektronik.

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