Data processing method and circuit for data recording and reproducing and data recording and reproducing apparatus

摘要

Embodiments of the invention a signal processing method capable of realizing low decoding error ratio by using a simple configuration free from unnecessary redundant bits. In one embodiment, user data (512 bytes+additional data) input to an input terminal is RLL-encoded by a RLL encoder 1. The data from the RLL encoder_- 1 is entered into a symbol error correction encoder where 9-bit symbol encoding is done. Its RS code portion is RLL-encoded by a RLL encoder_- 2 . Signal read from a magnetic disk is entered into a RLL decoder_- 2 where the RS code portion is RLL-decoded. The signal from the RLL decoder_- 2 is then entered into a symbol error correction decoder where random read/write errors, burst errors attributable to defects and other errors are corrected to produce a (user data+RLL) signal. This data is output to an output terminal after being decoded by a RLL decoder_- 1.