H - Electricity – 04 – N
Patent
H - Electricity
04
N
352/18.1
H04N 9/84 (2006.01)
Patent
CA 1137625
15.2.79 1 PHO 78508 ABSTRACT: Reproducing apparatus for a colour television signal recorded on a record carrier. In a reproducing apparatus for a colour tele- vision signal recorded on a record carrier, of which at least the chrominance signal which contains the colour synchronizing signals is recorded with periodically changed polarity in the individual line period sectors in at least one of two adjacent tracks, the polarity of the reproduced signal in the individual line period sectors is switched so by means of a polarity switching device that the polarity change effected during recording is cancelled, which enables cross-talk signals from an adjacent track to be suppressed. In order to ensure that the change in polarity during reproduction is always in synchronism with the change in polarity during recording, there is provided an identification circuit for the phase relationship between two such colour synchronizing sig- nals, which should be in phase in conformity with the television standard when the polarity change during re- production exactly cancels the polarity change effected during recording. Thus, in the case of an incorrect polarity during reproduction this identification circuit supplies a signal by means of which the switching state of the polarity switching device is each time changed by one switching steps until the polarity change during reproduction is again in synchronism with the polarity change during recording.
327399
Melwisch Harald
Suss Dietfried
N.v. Philips Gloeilampenfabrieken
Van Steinburg C.e.
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