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US 5,406,569 AGranted
Error correcting apparatus for digital data and digital synchronizing detecting apparatus
AssigneeSony Corporation
InventorMasaaki Isozaki
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AssigneeSony Corporation
InventorMasaaki Isozaki
Estimating the term…
The present invention is directed to a digital data error correcting apparatus in which an error correction capability can be considerably improved in a digital signal transmission system when a digital modulation code is decoded. In a minimum distance decoding method, when a plurality of reference samples having equal minimum Hamming distance relative to a digital modulation code exist, on the basis of the probability that an error will occur in the respective bits, respective bits are weighted, and a reference sample having the minimum distance from the input sample is selected from a plurality of reference samples to thereby correct an error. Further, the present invention is directed to a digital sync. detection apparatus in which an ability for detecting a sync. pattern can be considerably improved without degrading the probability that a pseudo-sync. signal will occur. A detection interval of a predetermined cycle is set in a sync. pattern of a predetermined cycle whose Hamming distance between it and a digital modulation code is larger than k by a detection window signal generator circuit (40), and (k-1) bit error of the sync. pattern can be corrected during this detection interval.
A digital data error correcting apparatus which includes data sequence comparing an means for comparing input data sequence supplied thereto via a predetermined transmission system and a group of reference data sequences of the same length of said input data sequence at every bit and data sequence selecting means for selecting from said reference data sequences a reference data sequence whose distance relative to said input data sequence is minimized on the basis of an output of said data sequence comparing means, comprising:
A digital synchronizing detection apparatus for detecting a synchronizing data sequence of a predetermined pattern inserted into a series of input data sequences at a predetermined cycle and whose distance relative to said input data sequences becomes more than k from said series of input data sequence, comprising:
Dependencies are inferred from the claim text.