Pseudo product code coding and decoding equipment and method thereof

Abstract

A pseudo product code decoding apparatus has the following units: a first error correction code decoding unit for effecting error correction by using parity symbols of a first linear-structure error correction code contained in an input symbol train that constitutes a pseudo product code codeword; a second error correction code decoding unit for effecting error correction by using parity symbols of a second linear-structure error correction code; a second-series information symbol extracting unit for extracting second-series information symbols; a subtraction code generating unit for generating a subtraction code of a pseudo product code codeword formed of the second-series information symbols, with the first-series information symbol portion and the second linear-structure error correction code portion being changed to zero codes; a transforming unit for transforming the pseudo product code codeword into a product code codeword through execution of subtracting processing with the subtraction code; an error correction code repetitive decoding unit for effecting decoding processings a plurality of times, thereby effecting error correction; and a first-series information symbol extracting unit for extracting the first-series information symbols.

Description

technical field [0001] The present invention relates to an apparatus and method for encoding and decoding pseudo-product codes, which are suitable for use in digital devices using pseudo-product codes, such as digital video tape recorders, digital audio recorders, digital communication devices, and the like. More particularly, the present invention relates to a pseudo-product code encoding and decoding apparatus and method in which after converting a pseudo-product code into a product code, a decoding process is performed in order to improve error correction capability. Background technique [0002] In recent years, recording / reproducing apparatuses such as digital video tape recorders and digital sound recorders have come into use, which digitally process input video signals and audio signals, and record the resulting digital signals. [0003] refer to Figure 15 A typical existing recording / reproducing apparatus 200 of the type described above includes a video signal code ...

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Problems solved by technology

refer to Figure 19 , Figure 17 Errors in the parity symbols in the C1 code in symbol group 223 are not corrected, although the C2 code is decoded to match the Figure 19 Different occasions, it is impossible to achieve error correction

Thus, the decoding process of the pseudo-product code by the conventional pseudo-product code decoder 240 undesirably produces very poor error correction capability compared to the case of a perfect product code having nearly the same parameters as the pseudo-product code

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