H - Electricity – 04 – N
Patent
H - Electricity
04
N
352/18, 350/38
H04N 9/79 (2006.01) H04N 9/84 (2006.01)
Patent
CA 1194215
22 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 N 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, this PAL phase inversion can be switched in such a way that this 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 the comb filter, which may be employed in video recording systems with parallel tracks in which the PAL phase is aligned in directions per- pendicular to the tracks by use of additional PAL phase inversions during recording, and in video recording systems in which this 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.
410673
N.v. Philips Gloeilampenfabrieken
Van Steinburg C.e.
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