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CD data interpretation method and CD data front end processing circuit

A technology for data decoding and optical discs, which is applied in the field of data signal processing and decoding, can solve the problems of picking discs, easy scratches of optical discs, and non-compliant 16-bit data, etc., to achieve the effect of improving reliability

Inactive Publication Date: 2006-09-20
TIAN HLDG LLC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Because the storage density of DVD disc data is very high, and the reading speed of today's optical drives is getting higher and higher, coupled with the characteristics of discs that are easy to scratch, etc., it is easy to appear inconsistencies in the process of reading data from DVD discs. The 16-bit data of the above-mentioned modulation rules, if there is no appropriate optical disc data decoding method and device to process, it will be handed over to the subsequent demodulation module for processing, which will reduce the reliability of data reading, or even cause chip picking or no data reading And other issues

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  • CD data interpretation method and CD data front end processing circuit
  • CD data interpretation method and CD data front end processing circuit
  • CD data interpretation method and CD data front end processing circuit

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Embodiment Construction

[0042] figure 1 It shows a partial functional block diagram of a DVD disc data decoding according to a preferred embodiment of the present invention, please refer to figure 1 . When reading the data of the DVD disc, firstly, the sensor (not shown) induces the laser to obtain the radio frequency data RF DATA, and the RF DATA passes through the data shaping circuit 100 to generate the digital original data signal DSEFM and the clock signal EFMCLK, the two The signal is sent to the pre-processing circuit 101 provided by the present invention to obtain the waveform guaranteed data signal DSEFM_Modify.

[0043] The pre-processing circuit 101 judges the clock signal EFMCLK and the original data signal DSEFM according to and judges. When the two signals do not conform to the encoding rules of the optical disk, for example: the same state of the original data signal DSEFM lasts less than the minimum transition period of the clock signal, then The original data signal DSEFM is adjust...

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Abstract

The present invention provides one kind of circuit and method of pre-treating CD data, especially for treating signal waveform disagreeing the CD data encoding rules. The signal waveform disagreeing the CD data encoding rules is so regulated that it will not change in at least three clock periods. Or, the 16-bit data disagreeing the CD data encoding rules may be guessed to replace with closest correct 16-bit data before decoding or decoded directly through table lookup to guess the closest correct 8-bit data, so that the decoding module can obtain more data for subsequent treatment. The present invention can raise the reliability of data reading.

Description

technical field [0001] The invention relates to a method for processing and decoding data signals of an optical storage medium, in particular to a method for pre-processing the data signals and decoding the data when the optical disc data is read. Background technique [0002] In order to adapt to the characteristics of optical discs and increase the reliability of optical disc data reading, when the data is stored on a CD disc (Compact Disk), it will perform 8-14 modulation (Eight to Fourteen Modulation referred to as EFM) and Reed-Soloman code modulation processing. And disrupt the order of data storage in the way of Interleave. When reading data from a CD disc, it is first necessary to sense the laser reflected from the disc to obtain radio frequency data (Radio Frequency Data referred to as RF DATA), and then generate digital data signal DSEFM and clock signal EFMCLK according to this RF DATA. Then, the EFM data decoding must be performed on the two signal data, and the...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B20/18H03M7/00G11B7/00G11B20/10
Inventor 欧阳世龙
Owner TIAN HLDG LLC