Patent ID: 6128358
Filing Date: 2000-10-03
Classification: G11B,H04L

Abstract:
A synchronizing signal detecting circuit for detecting a synchronizing signal included in a synchronizing block, said synchronizing signal detecting circuit comprising:bit shift value detecting means for respectively calculating hamming distances between a plurality of detection patterns, which respectively have a plurality of bits and are formed by shifting a pattern of said synchronizing signal by one bit and have a hamming distance of at least a predetermined value therebetween, and the pattern of said synchronizing signal and outputting a bit shift value of said synchronizing signal based on the results obtained by respectively comparing the plurality of hamming distances and the predetermined value;shift means for respectively shifting bit positions of synchronizing signals of said synchronizing block and a next synchronizing block subsequent to said synchronizing block, in accordance with the bit shift value from said bit shift value detecting means; andsynchronizing signal outputting means for outputting a respective synchronizing signal based on a comparison between the synchronizing signal of said synchronizing block and the synchronizing signal of the next synchronizing block;wherein said synchronizing signal outputting means comprises first hamming distance calculating means for calculating a hamming distance between the pattern of the synchronizing signal of said synchronizing block and a reference synchronizing signal pattern; second hamming distance calculating means for calculating a hamming distance between the pattern of the synchronizing signal of the next synchronizing block and the reference synchronizing signal pattern; and third hamming distance calculating means for calculating a hamming distance between an identification code included in said synchronizing block and an identification code included in the next synchronizing block, andwherein said synchronizing signal outputting means outputs a synchronizing signal when the sum value of respective outputs from said first, second and third hamming distance calculating means is no more than a value of a preset hamming distance.