System for recording and detecting marking signals

专利名称：System for recording and detecting marking

signals

发明人：Hans Schranz申请号：US07/395127申请日：19890817公开号：US05126888A公开日：19920630

摘要：A system for recording a plurality of marking signals on a record carrier trackduring scanning thereof, and for detecting from the track during scanning thereof themarking signals recorded thereon. The system includes recording apparatus whichgenerates the marking signals (M1, M2, M3) as different combinations of first and secondrecording signals (S1, S2) of different frequencies and of durations which are selected byrespective time-control stages (Z1, Z2). The first marking signal (M1) may consist of onlythe first recording signal (S1) having a predetermined duration T; the second markingsignal (M2) may consist of the combination of the first marking signal (S1) of duration Tand the second marking (S2) of the same duration T; and the third marking signal (M3)may consist of the combination of the first recording signal (S1) of duration (P) and thesecond marking signals (S2) of a duration between T and zero such as T/2. The systemalso includes reproducing apparatus for detecting during scanning of the track detectionsignals (S1', S2') corresponding to the recording signals (S1, S2) recorded thereon, thereproducing apparatus including time-measurement stages (Z3, Z4) for determing theduration at least the detection signal (S2') corresponding to the recording signal (S2)which may have various different durations, and a logic circuit which combines the

detection signals in accordance with the determined durations so as to derive themarking signal represented thereby.

申请人：U.S. PHILIPS CORPORATION

代理人：Leroy Eason

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