SIDE-CHANNEL FOR RECORD CARRIERS WITH SPIRAL TRACKS

In order to create a record carrier having a side-channel which cannot be copied with a channel-bit recorder, the record carrier ( 1 ) has a modulated spiral. By modulating one or more of the spiral parameters, like the channel bit length or the track pitch, a side-channel is created. If a record ca...

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Bibliographische Detailangaben
Hauptverfasser:	LAMBERT, NICOLAAS, DENISSEN, ADRIANUS, J., M, TALSTRA, JOHAN, C, STARING, ANTONIUS, A., M, AKKERMANS, ANTONIUS, H., M, DEBOER, JAN, H
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	INFORMATION STORAGE INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER PHYSICS
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Beschreibung
Zusammenfassung:	In order to create a record carrier having a side-channel which cannot be copied with a channel-bit recorder, the record carrier ( 1 ) has a modulated spiral. By modulating one or more of the spiral parameters, like the channel bit length or the track pitch, a side-channel is created. If a record carrier having such a side-channel is copied using a channel-bit recorder, the information present in the side-channel is lost. The number of bits to be stored in the modulated spiral can be selected as desired; also the way in which the bits are present can be selected; the bits can e.g. can be stored in different bands (A,B,C,D) present on the record carrier, in which band the spiral parameter modulated can be kept constant.