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Method and apparatus for data reproducing using iterative decoding in a disk drive

An iterative decoding, disk drive technology, applied in the direction of error correction/detection using linear codes, error correction/detection using block codes, recording/reproduction/deletion methods, etc., can solve problems such as performance degradation

Inactive Publication Date: 2005-06-15
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, for example, this method presents a problem that an error correction function such as applying the Reed-Solomon decoding method degrades the performance

Method used

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  • Method and apparatus for data reproducing using iterative decoding in a disk drive
  • Method and apparatus for data reproducing using iterative decoding in a disk drive
  • Method and apparatus for data reproducing using iterative decoding in a disk drive

Examples

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no. 1 example

[0022] A first embodiment of the present invention will be described below with reference to the drawings.

[0023] figure 1 is a block diagram showing the main part of the read / write channel 5 which is the data reproducing device related to the present embodiment. FIG. 2 is a block diagram showing the main part of the disk drive including the read / write channel 5. As shown in FIG.

[0024] (Disk drive structure)

[0025] A disk drive as shown in FIG.

[0026] A spindle motor (SPM) 2 rotates the disk 1 . The magnetic head 3 includes a read head device (GMR device) and a write head device, and reads data from the disk 1 by the read head device. In addition, the magnetic head 3 writes data on the disk 1 by a write head device.

[0027] The pre-amplification circuit 4 has a read amplifier 40 that amplifies a data signal (read data signal) read by the read head device and sends the amplified data signal to the read / write channel 5 . Furthermore, the pre-amplification circuit...

no. 2 example

[0056] Figure 8 with Figure 9 is a block diagram showing the main parts of the R / W channel 5 and the iterative decoder 55 related to the second embodiment.

[0057] That is, if Figure 8 As shown in , the R / W channel 5 of this embodiment is constructed in such a way that the recursive systematic convolutional (RSC) encoder 80 of the outer code is cascaded in series with the PR channel of the inner code. Therefore, if Figure 9 As shown in , the iterative decoder 55 performs an iterative decoding process by the channel decoder 550 for performing the decoding process of the PR pass of the inner code and the RSC decoder 90 for performing the decoding process of the RSC encoding group of the outer code.

[0058] In this respect, the operations in the iterative decoder 55 including the operations of the LLR adjuster 551 and the RLL error detector 552 are the same as in the case of the first embodiment.

no. 3 example

[0060] Figure 10 with Figure 11 is a block diagram showing main parts of the R / W channel 5 and the iterative decoder 55 related to the third embodiment.

[0061] That is, if Figure 10 As shown in , the R / W path 5 of this embodiment is constructed in such a way that the parity-check (PC) encoder 100 of the outer code is cascaded in series with the PR path of the inner code. Therefore, if Figure 11 As shown in , the iterative decoder 55 performs an iterative decoding process by the channel decoder 550 for performing the decoding process of the PR pass of the inner code and the PC decoder 110 for performing the decoding process of the RSC encoding group of the outer code.

[0062] In this respect, the operations in the iterative decoder 55 including the operations of the LLR adjuster 551 and the RLL error detector 552 are the same as in the case of the first embodiment.

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Abstract

A disc drive using a read / write channel (5) comprising an iterative decoder (55) for performing an iterative decoding process is disclosed. The iterative decoder (55) has a RLL error detector (552) for detecting burst error parts from the LLR set output from the channel decoder (550) and LLR adjuster (551). The LLR adjuster (551) adjusts by reducing the value of the set of LLRs corresponding to the detected error portion of the burst.

Description

technical field [0001] The present invention generally relates to the field of disc drives, and more particularly to a device for data reproduction applying an iterative decoding method. Background technique [0002] Generally, in the field of disk drives typified by hard disk drives, a signal processing circuit called a read channel that processes data signals read by a magnetic head from a disk medium (hereinafter simply referred to as disk) to reproduce original data is used. [0003] Usually, a signal processing circuit is constituted by a specially designed LSI. The signal processing circuit includes a write channel for processing write data to record the data on the disc. Signal processing circuits are also called read / write channels or data channels. [0004] Current read / write channels use a data decoding mode (data reproduction method) that is a combination of a partial response mode and a Viterbi decoding method, the so-called partial response maximum likelihood ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B20/10G11B20/18H03M13/09H03M13/19H03M13/29H03M13/39
CPCH03M13/1102H03M13/29H03M13/3746H03M13/63
Inventor 赤松学
Owner KK TOSHIBA
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