PAL Comb filter

Details PAL Comb filter PAL Comb filter

1982-08-30

1984-10-30

Masinick, Michael A.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358328, 358329, H04N 9535

Patent

active

044802650

ABSTRACT:
A PAL comb filter having a first and a second parallel transmission path. The first path includes a time delay network. This time delay network has a time delay equal to one line period H instead of two line periods as in conventional PAL comb filters. For this purpose a PAL inverter is arranged in one of the two paths. Alternatively, said PAL phase inversion can be switched in such a way that said inversion is effected either in the first or in the second path, change-over causing an additional PAL phase inversion of the output signal of said comb filter, which may be employed in video recording systems with parallel tracks in which the PAL phase is aligned in directions perpendicular to the tracks by the use of additional PAL phase inversions during recording, and in video recording systems in which said alignment is not used, in order to ensure, inter alia during fast-motion playback, that the PAL phase inversion sequence in the reproduced signal is not disturbed.

REFERENCES:
patent: 4136358 (1979-01-01), Clemens
patent: 4200881 (1980-04-01), Carnt
patent: 4282545 (1981-08-01), Bragas
patent: 4345268 (1982-08-01), Clarke

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