Method for reducing the noise in a wobble signal

Details Method for reducing the noise in a wobble signal Method for reducing the noise in a wobble signal

G - Physics

11

B

G11B 7/005 (2006.01) G11B 7/00 (2006.01) G11B 20/10 (2006.01) G11B 27/24 (2006.01)

Patent

CA 2456419

The present invention relates to a method and a circuit for recovering information (INF) contained in a wobble track (36) of an optical storage medium (34).One aim of the invention is to describe a method within an appliance for reading from and/or writing to optical storage media (34), which can correct disturbing data signal components (AS') in the wobble signal (TW) even when the swept frequency and the lowest signal frequency are close to one another.According to the invention, this object is achieved in that the signals (A+D,B+C) from two detector halves (1A+1D,1B+1C) of a photodetector (1) which is used for reading the data contained in a track (36) on an optical storage medium (34) are provided with weighting factors (K1, K2) which are adjusted dynamically during operation of the appliance for reading from and/or writing to optical storage media. In order to adjust the weighting factors (K1, K2), the obtained swept- frequency signal (TW) is linked to a data signal (HF).

La présente invention concerne un procédé et un circuit de récupération de l'information (INF) contenue dans une piste affectée de vobulation (36) d'un support d'enregistrement optique (34). L'un des procédés de l'invention est destiné à un appareil de lecture et/ou d'écriture sur support d'enregistrement optique (34) capable de corriger des composantes perturbantes du signal de données (AS') dans le signal vobulé (TW), même en cas de grande proximité entre la fréquence balayée et la fréquence de signal la plus basse. A cet effet, les signaux (A+D, B+C) des deux demi-détecteurs (1A+1D, 1B+1C) du photodétecteur (1) utilisé pour la lecture des données contenues dans une piste (36) d'un support d'enregistrement optique (34) sont affectés de facteurs de pondération (K1, K2) qui se reprennent dynamiquement pendant le fonctionnement de l'appareil. Pour que la reprise des facteurs de pondération (K1, K2) puisse se faire, le signal obtenu dans la fréquence balayée (TW) est relié à un signal de données (HF).

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