Publication detail

Modelling the focus error signal generation in a DVD player

HNILIČKA, B., BESANCON-VODA, A., SCHROEDER, H.

Original Title

Modelling the focus error signal generation in a DVD player

Type

conference paper

Language

English

Original Abstract

This paper presents a new method for modelling the focus error signal generation in a DVD player (so called the S-curve), using optical theory. The model is applied to an industrial system, developed in STMicroelectronics laboratories, and it can be useful firstly during the start-up procedure (when data layer is searched for) and secondly during normal playing mode, to tune the controller gain for the desired closed-loop bandwidth. An analytical and a numerical model, based on astigmatic method and on opto-geometrical analysis, are given and the influence of models parameters on the focus error signal is discussed. To estimate the unknown models parameters, a curve fitting method is applied, using measured data from the industrial system. The model quality is illustrated from a comparison with the real focus error signal, acquired during the start-up procedure (from open loop to closed loop). The results of this modelling are included in the DVD focus closed loop to design more sophisticated controllers for focus error minimization.

Key words in English

Focus error signal

Authors

HNILIČKA, B., BESANCON-VODA, A., SCHROEDER, H.

RIV year

2003

Released

9. 7. 2003

Publisher

Ecole Centrale de Lille

Location

Lille

ISBN

2-9512309-5-8

Book

IMACS Multiconference Computational Engineering in Systems Applications

Pages from

11

Pages to

18

Pages count

8

BibTex

@inproceedings{BUT7916,
  author="Bohumil {Hnilička} and Alina {Besancon-Voda} and Heinz-Joerg {Schroeder}",
  title="Modelling the focus error signal generation in a DVD player",
  booktitle="IMACS Multiconference Computational Engineering in Systems Applications",
  year="2003",
  pages="8",
  publisher="Ecole Centrale de Lille",
  address="Lille",
  isbn="2-9512309-5-8"
}