Abstract: Digital data which has been error correcting code encoded includes a sequence of codeblocks, each having a sequence of symbols. The symbols of said codeblocks are interleaved in a sequence of sync blocks each of which includes a sequence of symbols, at least one symbol from each code word. The symbols are reordered from a normal consecutive sequence in order to equalize the likelihood of a symbol corruption across the codeblocks of said digital data especially in systems where there is error propagation.

Abstract: Magnetic recording and/or reproducing schemes and systems particularly for use for recording and/or reproducing information in data tracks of a magnetics-on-film (MOF) layer in the image area of a photographic filmstrip in a camera or in other photographic equipment. Recording of a photographic data set related to captured images is effected in n lengthwise extending, total interleaved tracks effected in the alternative by a single one or plural magnetic head array(s) of m magnetic recording heads arranged to extend across the filmstrip width and positioned in the camera alongside the photographic image frame gate.

Abstract: Data deskewing apparatus includes two, byte organized random access memories for storing, aligning and then reading out channels of data which were originally skewed when read in from a multitrack magnetic recorder system. While write-in operations on skewed data are taking place in one of the random access memories (RAM), read-out operations on skew-corrected data, which had been written in on the previous cycle, are taking place in the other RAM. On the completion of a write in/read out cycle, the roles of the RAM's are interchanged, and the process repeated.

Abstract: In formatting a digital data stream for interleaved recording with included resynchronization sequences inserted into the data stream, rather than recurrently recording the resynchronization sequences at the boundaries of the interleave blocks or recording many resynchronization sequences throughout the data, the present invention teaches staggered recording of the resynchronization sequences throughout the page of interleaved code words in a pseudo-random fashion. This staggering of the resynchronization sequences throughout the interleave blocks "randomizes" the errors due to tape drop outs so that errors are more uniformly distributed among the positions in the code words, and attendantly, are more likely to be correctable.