System for noise-free detection of wobbles of optical disk pregr

Details System for noise-free detection of wobbles of optical disk pregr System for noise-free detection of wobbles of optical disk pregr

1996-06-27

1998-02-10

Tran, Thang V.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

G11B 700

Patent

active

057176795

ABSTRACT:
An apparatus for use with a recordable compact disk having an optically discernible pregroove formed thereon to provide a multiturn spiral track along which data pits are to be formed. Each pregroove turn is partly wobbled to represent addresses. Since wobble detection is easy to be impeded by track eccentricity with respect to the axis of disk rotation, a pair of compensator circuits are connected one to each output of a composite photodetector for eliminating from the photodetector output signal a frequency component due to track eccentricity. Each compensator circuit comprises a variable gain amplifier circuit, and a feedback loop for varying the amplifier gain in inverse proportion to the amplitude of the frequency component due to track eccentricity.

REFERENCES:
patent: 5109369 (1992-04-01), Maeda et al.
patent: 5570335 (1996-10-01), Ogata et al.
patent: 5606544 (1997-02-01), Katsuhara
patent: 5631891 (1997-05-01), Moritsugu et al.
patent: 5631892 (1997-05-01), Bakx

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