High-density CD error correcting code decoding device and method

Abstract

The invention relates to an error correction code decoding device and a corresponding method for a high-density optical disc. When demodulating a data stream read from a high-density optical disc such as a Blu-ray disc, the demodulation (Demodulation) is performed according to a preset 17PP demodulate it into a specific format; in the process of error correction (ECC) and decoding of the demodulated data stream, a part of the LDC code word and the BIS code word are compared and retrieved together to determine whether there is a burst error (Burst Error); according to the judgment result, more accurately mark erasure (Erasure). In this way, if a burst error exists in the interval between the middle part of the LDC code word and the next BIS code word adjacent to the LDC code word; or there is no burst error in the LDC code word, and the preceding and following LDC code words If an error occurs in a BIS code word, the device and method provided by the present invention can also accurately mark erasure at the position where the error occurs, thereby effectively preventing errors during the execution of error correction and decoding operations.

Description

technical field [0001] The present invention relates to an error correction code decoding device and a corresponding method for a high-density optical disc, specifically, a device for performing more accurate error correction and decoding operations on a data stream read from a high-density optical disc such as a Blu-ray disc. An error correction code decoding device for a high-density optical disc and a corresponding method. technical background [0002] In general, in recording media such as Blu-ray Discs, which can record and play high-quality video data and high-quality audio data for a long period of time, such as figure 1 As shown, a recording frame (Recording Frame) with 1288 data bits (Data bits) is recorded, each recording frame has four 38-bit LDC (LDC: LogDistance) code words, three 1-byte burst indicators Code BIS (BIS: Burst Indicator Subcode), 20-bit frame sync (Frame Sync) and 28 1-bit DC control (DC-control). [0003] The above-mentioned LDC codeword and BI...

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Problems solved by technology

However, if image 3 As shown, if the length is a burst error of less than 40 bytes, and the error exists between the middle position of the LDC code word and the next BIS code word, then the LDC code word with the above burst error will not be identified Erase, which throws the error

[0008] or as Figure 4 As shown, even if there is no burst error on the LDC code word, when an error occurs on two adjacent BIS code words, the LDC code word mark existing between the two BIS code words will be erased, resulting in Abnormal execution of error correction and decoding operations

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