Error correcting apparatus for digital data and digital synchron

Details Error correcting apparatus for digital data and digital synchron Error correcting apparatus for digital data and digital synchron

1992-10-27

1995-04-11

Gordon, Paul P.

Excavating

375368, H03M 1300

Patent

active

054065690

ABSTRACT:
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.

REFERENCES:
patent: 4682333 (1987-07-01), Onishi et al.
patent: 5022029 (1991-06-01), Gulchon
patent: 5150381 (1992-09-01), Forney, Jr. et al.
patent: 5285454 (1994-02-01), Blaum et al.

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