Encoding devices, decoding devices, encoding/decoding devices, and recording/reproduction devices

Abstract

The invention relates to a coder, a decoder and a recoding / reproducing device. An error correction device error corrects without increasing the circuit scale. An encoder includes: a first ECC encoder which interleaves a data string into n (n >= 2) blocks of data strings at every m (m >= 2) bits, and adds the error correction code parity; a parity encoder which creates a parity bit at every plurality of bits of the error correction code word, and adds the parity bit to said error correction code word; and a second ECC encoder, which generates a second error correction encoding, which is a linear encoding using iterative decoding. Concatenated type encoded data, where a parity bit is added to every plurality of bits, is created, so an increase of circuit scale can be prevented even if a data string is interleaved into a plurality of blocks and error correction code parity is generated.

Description

technical field [0001] The present invention relates to an encoding apparatus, a decoding apparatus, an encoding / decoding apparatus, and a recording / reproducing apparatus for data including an error correction code for a recording / reproducing apparatus and a communication apparatus, and more particularly, to a An encoding device, a decoding device, an encoding / decoding device, and a recording / reproducing device for performing error correction on a data block to which an ECC (Error Correction Code) is attached. Background technique [0002] In the fields of recording / reproducing apparatuses such as magnetic disk apparatuses and communication systems, in order to correct data errors generated during recording / reproducing steps and in transmission lines, error correction techniques using error correction codes (ECC) are widely used. [0003] A Reed Solomon (RS) code is used as the ECC code (for example, Japanese Patent Application Laid-Open No. H11-330985). In the RS code, the...

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Problems solved by technology

[0018] However, in the case of a conventional method combining an LDPC code for iterative decoding and an RS code for ECC in a subsequent stage, the error correction capability of iterative decoding is improved, but it is difficult to expect improvement in the error correction capability of ECC

[0019] On the other hand, in the case of the proposal of the conventional error correction method (ECC) of the concatenated RS code and the parity code, which is based on the assumption of using maximum likelihood decoding, the error correction capability of the decoding is not high

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