Error-correcting method and apparatus for the transmission of wo

Details Error-correcting method and apparatus for the transmission of wo Error-correcting method and apparatus for the transmission of wo

1984-01-24

1986-08-12

Atkinson, Charles E.

Excavating

371 38, G06F 1110

Patent

active

046060260

ABSTRACT:
A description is given of an error-correcting method for the transmission of word-wise organized data and devices for performing the method. The data words are group-wise received and some redundant words (114) of an error-detecting code are added to each group so that a first number of words is obtained, which is applied to a further encoder in two versions (118,121) having the same data content; these versions, however, are separated from one another in time over a given distance. Subsequently, a first series of check words of a first error-correcting code is added to a first group of words. The group of words and the associated check words are interleaved among as many second numbers of words. Subsequently, a second series of check words of a second error-correcting code is added to every second number of words. When the words are received from the medium, first the correction is performed by means of the two error-correcting codes and subsequently the two versions of the first numbers of words are combined again (95). The error-detecting code can thus make an optimum choice between the two versions. When use is made of a medium in the form of a disc which can be optically scanned, the entire information is applied thereto twice, an offset amounting to a fixed number of tracks being used betwen the first and the second time.

REFERENCES:
patent: 4206440 (1980-06-01), Doi et al.
patent: 4413340 (1983-11-01), Odaka et al.
patent: 4437185 (1984-03-01), Sako et al.
patent: 4445216 (1984-04-01), Kobari et al.
patent: 4477903 (1984-10-01), Immink et al.

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