G - Physics – 11 – B
Patent
G - Physics
11
B
352/16, 179/17
G11B 27/28 (2006.01) G11B 5/09 (2006.01) G11B 20/08 (2006.01) G11B 20/12 (2006.01) G11B 27/10 (2006.01) G11B 27/32 (2006.01) G11B 27/34 (2006.01)
Patent
CA 1219067
33 ABSTRACT "System for recording and/or detecting two marking sig- nals." In a system for recording and/or detecting two marking signals which can be recorded on and scanned from a record carrier (2) and which differ from each other in respect of at least one Parameter, the generator means (14) for generating the marking signals comprise at least one pulse generator which supplies marking signals in the form of two marking-pulse trains M1 and M2 having the same frequency but having different duty factors with the values k and 1-k respectively, which differ from 0.5 and the detection means (22) for detecting marking signals comprise at least one duty-factor detector, which detects the duty factor of a marking pulse train M1 or M2 respec- tively and which supplies a specific detection signal in conformity with its detected pulse train (Fig. 1).
442414
N.v.philips'gloeilampenfabrieken
Van Steinburg C.e.
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