Patent ID: 7054243

Claim:
A playback apparatus for reading information from a track ( 1 ) of an information carrier ( 2 ) that can be accommodated in said playback apparatus, which information carrier ( 2 ) exhibits a first variation of a first physical parameter, which first variation corresponds to the information recorded on the information carrier ( 2 ), and which information carrier ( 2 ) is capable of exhibiting a second variation of a second physical parameter, which second physical parameter differs from the first physical parameter, which playback apparatus comprises: scanning means ( 4 ) for scanning the information carrier ( 2 ) and emitting a first detection signal (D 1 ) which exhibits a first signal variation in dependence on the first variation, and emitting a second detection signal (D 2 ) which exhibits a second signal variation in dependence upon the second variation; displacement means ( 3 ) for bringing about a relative displacement of the track ( 1 ) with respect to the scanning means ( 4 ); decoding means ( 5 ) for converting the first detection signal (D 1 ) to a decoded signal (DS) in dependence upon the first signal variation, which decoding means comprise first phase-locked loop means ( 51 ), and detection means ( 6 ) for detecting the second variation of the second physical parameter by means of the second detection signal (D 2 ) in a second frequency spectrum situated outside a first frequency spectrum of the first signal variation, characterized in that the detection means ( 6 ) are embodied so as to make use of the first phase-locked loop means ( 51 ) of the decoding means ( 5 ) to detect the second variation.