Koninklijke Philips Corporation N.V.

Koen Vanhoof

Aalbert Stek

Shoei Kobayashi

Tamotsu Yamagami

Cornelis Marinus Schep

Constant Paul Marie Jozef Baggen

Nobuyoshi Kobayashi

David Modrie

Shinichiro Ilmura

A receiver is described for delivering a data sequence (ak) at a data rate 1/T from an analog signal (Sa), the receiver comprising: a) converting means () for generating a received sequence (rn) by sampling the analog signal (Sa) with a sample rate of 1/Ts, whereby the sample rate 1/Ts of the received sequence (rn) is controllable by a preset value (Pv); b) digital processing means () for delivering a processed sequence (yn) by processing the received sequence (rn); c) a first sample rate converter () converting the processed sequence (yn) into an equivalent processed sequence (ye) at the data rate 1/T, whereby the data rate of the equivalent processed sequence (ye) is controllable by a control signal (Sc); d) an error generator () for delivering an error sequence (ek) from the equivalent processed sequence (ye); e) a control signal generating means () for generating the control signal (Sc) dependent on the error sequence (ek); f) a detector () for deriving the data sequence (ak) from the equivalent processed sequence (ye),whereby the ratio between the sample rates 1/T and 1/Ts is substantially constant. Conventional synchronous receivers which comprise a Sample Rate Converter have the disadvantage that the digital processing is performed within the control loop of the SRC. The delay resulting from the digital processing contributes to the overall delay of the loop, which can lead to instabilities, especially when high bandwidths are require. Therefore the receiver of the invention does the digital processing outside the control loop. To keep the advantage that the digital processing can be done at a fixed rate, the converting means () are controlled by a preset value for keeping the ratio T/Ts constant.

Semi-synchronous receiver and apparatus for reading information

A record carrier has a servo track () indicating an information track () intended for recording information blocks. The servo track () has a periodic variation of a physical parameter at a predetermined frequency and modulated parts for encoding position information at regular intervals. The modulated parts start with a bit sync element and are of a data type having a data bit element or of a word sync type having a word sync element. The bit sync element, word sync element and the data bit element being modulated according to a same predetermined type of modulation of the periodic variation. All distances between two adjacent of the elements constituting the modulated parts are unique.

Record carrier and apparatus for scanning the record carrier

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Leuven, Belgium

Koen Vanhoof