anleggning for transmission of digital information, kodningsanordning intended to anvendas in anleggningen,avkodningsanordning intended to anvendas in anleggningen and uppteckningsberare intended to anvendas in anleggningen

摘要

A system for transmitting digital information including a coding arrangement, a transfer medium, for example a record carrier, and a decoding arrangement. In the coding arrangement the digital information is received as groups of input words which are encoded to form code words, each code word corresponding to an input word. Each code word has a time duration equal to s tau O and each is assembled from M subgroups Gm of I signal positions tmi spaced by equal time intervals tau , where m is a number from 1 to M, inclusive, corresponding to a subgroup Gm and i is a number within each subgroup Gm from 1 to I inclusive. In each subgroup Gm, k of these signal positions tmi are always occupied by a signal which is distinguishable from the signal in unoccupied positions, where k is an integer smaller than I (1/=k/=I-1). The first positions of the subgroups Gm are located at mutually different time intervals epsilon m from the beginning of the code word, where O/= epsilon m/= tau with the restrictions M/=2 and IMAGE and the group of code words for which it holds that M=2, I=s=2, k=1, tau = tau O and epsilon 2= epsilon 1+1/2 tau being excepted.