Title:
【発明の名称】2値信号を符号化する方法と装置
Document Type and Number:
Japanese Patent JP2002509325
Kind Code:
A
Abstract:
A system and method described for avoiding catastrophic error sequences in a media code sequence of symbols for data storage on a storage medium according to EPRML. The system and method includes modulation encoding user data which is to be stored on the storage medium using a modulation encoder. The modulation encoder outputs a channel code modulation output symbol sequence. The modulation code is defined according to a modulation criteria wherein the set of all possible modulation output symbol sequences is constrained in a manner which excludes certain excluded modulation output symbol sequences. A precoder precodes the channel code modulation output symbol sequence according to a precoding transfer function. The precoding transfer function transforms the channel code modulation output symbol sequence into a media code sequence of symbols and the precoding transfer function is defined so that when modulation encoding is performed according to the modulation criteria, the media code sequence of symbols is constrained to exclude EPRML catastrophic error sequences of greater than a determined length. The combination of the modulation encoding and the precoding prevents the media code sequence of symbols from including EPRML catastrophic error sequences greater than the determined length.
Inventors:
Sea Min Sea
Tapal hemant
Tapal hemant
Application Number:
JP2000514405A
Publication Date:
March 26, 2002
Filing Date:
September 28, 1998
Export Citation:
Assignee:
Datapath Systems, Inc.
International Classes:
G06F11/10; G11B20/10; G11B20/14; G11B20/18; H03M5/14; H03M13/31; H03M13/41; (IPC1-7): G11B20/14; G06F11/10; G11B20/18; H03M13/41
Attorney, Agent or Firm:
Minoru Nakamura (9 outside)