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Device for reading-out and/or recording optical media

A kind of optical recording medium and medium technology, applied in the direction of optical recording head, optical recording/reproduction, optical recording/reproduction/erasing method, etc., can solve the problem of limited self-adaptation of the average value, and achieve the simple change of parameters Effect

Inactive Publication Date: 2007-02-21
DEUTSCHE THOMSON-BRANDT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The known device has the disadvantage that although the adaptation of the mean value takes place more rapidly in the case of a transition from one type of data field to another type of data field than without changing the time constant, the adaptation of the mean value still remains limited to this type of transfer

Method used

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  • Device for reading-out and/or recording optical media
  • Device for reading-out and/or recording optical media
  • Device for reading-out and/or recording optical media

Examples

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Embodiment Construction

[0025] figure 1 The components of the device according to the invention are schematically illustrated, which are essential for the invention. An optical recording medium 1 such as a CD or DVD is scanned by an optical scanner 2 by means of a scanning beam 3 . The light reflected by the recording medium 1 is detected and converted into one or more analog electrical signals in a known manner. The electrical output signal HF, which is forwarded by the optical scanner 2 to the analog-to-digital converter 4 , is represented here in a simplified manner. The digitized output signal HF' is fed to a data slicer 5. The average value M appears at the second input of the data slicer 5 . The data limiter 5 outputs a shaped output signal HF", if the digitized output signal HF' takes a value greater than the mean M, HF" takes a "high" value, if the digitized output signal HF' takes a value smaller than the mean M, HF " to take a "low" value.

[0026] The shaped output signal HF", also ca...

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Abstract

The present invention relates to a device for reading from and / or writing to optical recording media (1) having an optical scanner (2) for scanning the recording medium (1) by means of a light beam (3) and for generating scanning signals (HF) from the reflected beam (3), a data slicer (5) for converting a scanning signal (HF) output by the optical scanner (2) into a binary signal (HF'), an averaging unit (6) for forming an average value (M) from the scanning signal (HF, HF') as input signal of the data slicer (5), and a control unit (14) for changing a parameter (T, OF) of the averaging unit (6). According to the invention, this is achieved by virtue of the fact that the control unit (14) has a unit (8, 10) for outputting a comparison value (S, HFN) and a comparator (7, 11) for comparing the average value (M) with this comparison value (S, HFN).

Description

technical field [0001] The invention relates to a device for reading and / or writing to an optical recording medium, the output signal of the optical scanner of the device is converted into a shaped signal, also called a binary signal or a square wave signal, by means of a data slicer before the data is decoded . Background technique [0002] A device of this type is disclosed in EP-A-800163. In this arrangement, an average signal is formed from the scanning signal and used as an input signal for a data slicer. The control unit changes the time constant for the averaging process when large variations of the analog scanning signal are caused at different area boundaries of the data track of the recording medium. The known device has the disadvantage that although the adaptation of the mean value takes place more rapidly in the case of a transition from one type of data field to another type of data field than without changing the time constant, the adaptation of the mean val...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/00G11B7/004G11B20/10G06K7/00G06K7/10G11B7/005G11B7/125
CPCG11B7/005G11B7/004
Inventor 亚历山大·克拉夫切科马滕·卡布茨布鲁诺·佩塔文
Owner DEUTSCHE THOMSON-BRANDT GMBH