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Method and device for reading data

A technology for reading data and equipment, applied in the field of reading data from record carriers, which can solve the problem of increased noise

Inactive Publication Date: 2009-03-18
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

From Figure 2, it can be seen that the noise increase is larger when laser modulation is applied

Method used

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  • Method and device for reading data
  • Method and device for reading data
  • Method and device for reading data

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Embodiment Construction

[0038] figure 1 and 2 have already been described in detail in the opening paragraphs, so will not be described again.

[0039] image 3is a flowchart of a method of reading data from a record carrier according to an example of an embodiment of the invention. In order to ensure robust reading of data stored on record carriers such as CD, DVD, Blu-ray discs, it is required to generate readout signals with high quality. Data recovery becomes difficult if the input readout signal has small amplitude and is noisy. Therefore, a method of reading data from a record carrier, in particular from a Blu-ray Disc, is proposed in which the read signal has a higher signal-to-noise ratio, thereby improving the read performance. In step 302, the light source such as a blue laser works in a first working mode, wherein the current provided to the light source such as a blue laser diode for reading data is modulated, ie the laser modulator is turned on. Here, a laser modulator refers to a hi...

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Abstract

The present invention relates to a method of reading data from a record carrier, the method comprising the steps of: obtaining a readout signal by radiating the record carrier in a first mode and a second mode of operation of a light source, computing a quality factor of the readout signal for the first mode and the second mode of operation of the light source, determining a best mode of operation of the light source based on the computed quality factors and selecting the determined best mode of operation of the light source for reading data from the record carrier. This is useful for high-speed Blu-ray disc applications.

Description

technical field [0001] The invention relates to a method of reading data from a record carrier. [0002] The invention also relates to a device for reading data from a record carrier. [0003] The invention also relates to a software program for reading data from a record carrier. Background technique [0004] The data information is recorded on the record carrier eg as a series of pits and lands representing binary data and forming a track. Such information recorded on a record carrier such as CD, DVD, Blu-ray Disc is obtained from the read signal. The spot / laser spot remains locked to the track for scanning. To optically scan a rotating disc, an optical disc drive includes: a beam generator, such as a laser diode; an objective lens, to focus the beam / laser beam onto a spot on the disc; and an optical detector, to receive light reflected from the disc And for generating electrical detection signals. The reflected light spot is incident on the photodetector. A correspo...

Claims

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Application Information

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IPC IPC(8): G11B7/125
CPCG11B7/0956G11B7/005G11B7/126
Inventor J·L·巴克克斯
Owner KONINKLIJKE PHILIPS ELECTRONICS NV