Feature Based Control of Compact Disc Players

Peter Fogh Odgaard

Research output: PhD thesis

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Abstract

Two servo control loops are used to keep the Optical Pick-up Unit focused and radially on the information track of the Compact Disc. These control servos have problems handling surface faults on the Compact Disc. In this Ph.D thesis a method is proposed to improve the handling of these surface faults. The basic idea is to detect the surface faults and then the surface faults are detected, they are removed by an estimate of this surface fault based on previous encounter with the same fault. This method is formed by an improved localisation of the surface faults based on a new couple of residuals, which is formed by a developed optical model and a fault model. Different methods are developed to detect and localise the surface faults based on the residuals as well as a algorithm for classification of the surface faults. The estimation of the surface faults is performed by the used a Karhunen-Loève approximations. In addition these approximations is used to simulate the surface faults in a simulation model.
Original languageDanish
Publisher
Print ISBNsxxxxxxxxxx
Publication statusPublished - 2004

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