G - Physics – 11 – B
Patent
G - Physics
11
B
352/21.1
G11B 27/10 (2006.01) G11B 5/588 (2006.01) G11B 15/60 (2006.01)
Patent
CA 1116290
APHN 8513 ABSTRACT Playback apparatus for television signal recorded on a record carrier in oblique signal tracks, the television signals containing synchronizing pulses. The apparatus for scanning the tracks consists of a rotary transducer arrangement with two magnetic heads whose effective gaps have mutually dif- ferent azimuth angles. There is provided a detection circuit for phase shifts between consecutive pulse trains. The cir- cuit receives the trains of synchronizing pulses separated from the reproduced signal as an input signal and supplies a pulse- shaped output signal whose magnitude and polarity correspond to the instantaneous phase-shifts. This output signal is applied to a circuit for the formation of the difference between the out- put signals of the phase-shifts detection circuits whose output signal in its turn serves as and additional control signal for a servo system which is adapted to control the phase relationship between the signal tracks recorded on the record carrier and the tracks on the record carrier which are actually scanned by the magnetic heads.
283541
Looren de Jong Hendrikus
Melwisch Harald
Looren de Jong Hendrikus
Melwisch Harald
Van Steinburg C.e.
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