H - Electricity – 04 – Q
Patent
H - Electricity
04
Q
354/223.1
H04Q 3/00 (2006.01) H03M 13/05 (2006.01) H04L 1/00 (2006.01)
Patent
CA 1123958
28.3.79 1 PHN 9079 ABSTRACT: System for transmitting binary data via a number of channels. In a system for introducing binary data elements into or for extracting these elements from a medium, the medium comprises a number of data channels in which each time a group of data bits are introduced together, i.e. one per data channel. During the intro- duction, the data bits are also applied to a coding de- vice. In synchronism with the introduction of such a group of data bits, this coding device each time forms a first correction bit for a first correction channel and a second correction bit for a second correction channel. The first correction bit is formed on the basis of a second group of data bits, the second correction bits being formed on the basis of a third group of data bits. Each data channel supplies the data of two sub- groups of data bits for this purpose. When the delay operator having a length of one bit cell is represented by D, a series of directly successive bits can be re- presented by a polynomial in D: xO.DO + x1.D1 + x2.D2 + ..., in which xj (j = 0,1 ...) represents the bit value. The quotient of the polynominals relating to the two sub- groups of a data channel is different for each data channel in order to enable correction of an arbitrary error pattern in a single data channel. When the data bits and correction bits are extracted from the medium, each time a first and a second error elimination bit are 28.3.79 2 PHN 9079 calculated from the extracted data bits by using the same algorithm, i.e. the same configurations of the sub-groups. Comparison of first/second correction/elimination bit each time produces two error detection bits. When a given num- ber of successive error detection bits do not indicate a discrepancy, the passage through the medium is error-free. When a given configuration of discrepancies is detected, a correction vector is formed which indicates, after storage, the channel containing an error, whilst further error detection bits indicate the error pattern which can thus be corrected.
326468
Goethals Jean M.e.b.
Krol Thijs
N.v. Philips Gloeilampenfabrieken
Van Steinburg C.e.
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