Recording and reproducing apparatus, signal decoding circuit, error correction method, and iterative decoder

摘要

A recording and reproducing apparatus having an ECC-less error correction function includes an erasure detector (80) generating an erasure flag (ek) indicating disappearance of a read signal; and an iterative decoder (82) having two soft-in/soft-out (SISO) decoders, i.e., an inner decoder (84) and an outer decoder (86), and correcting the erasure by inputting the erasure flag (ek) into the inner decoder (84) and performing erasure compensation in the inner decoder. As the erasure compensation in the inner decoder, channel information is masked while the erasure flag (ek) is on. The erasure of data due to a media defect is detected inside the iterative decoder (82), and a second erasure flag (ek) is inputted into the inner decoder to perform erasure compensation in the inner decoder (84). IMAGE