Patent ID: 6856660
Filing Date: 2005-02-15
Classification: G11B,H04L

Abstract:
1. A data signal processing apparatus comprising: a data discriminator receiving an input data bit string; a post-coder which is connected to receive a bit string including data and data sync signals from said data discriminator and performs a predetermined post-code processing on said bit string; a decoder which is connected to receive the post-code processed bit string output from said post-coder, and decodes the post-code processed bit string to output reproduced data; a (1+D) processing unit which is connected to receive the post-code processed bit string output from said post-coder and performs a (1+D) processing on the post-code processed bit string; and a data sync signal detector which is connected to sequentially receive the (1+D) processed bit string from said (1+D) processing unit to detect the data sync signals, said decoder performing the decode operation upon detection of each data sync signal by said data sync signal detector; wherein said data sync signal detector includes a separator which separates the (1+D) processed bit string into a bit string of odd numbered bits and a bit string of even numbered bits and outputs each of the bit strings separated into a group of more bits of an arbitrary bit pattern interposed therebetween, a matching unit, provided one for each group, which compares a pattern of the bit string in each group with a corresponding predetermined sync pattern to detect a coincidence therebetween, and a decision unit which indicates detection of a data sync signal to said decoder when the number of groups that coincide with respective sync patterns is equal to or larger than a predetermined threshold value.