METHOD OF CODING A SEQUENCE OF BLOCKS OF BINARY DATA BITS INTO A SEQUENCE OF BLOCKS OF BINARY CHANNEL BITS,ARRANGEMENT FOR DEMODULATING THE DATA BITS CODED IN ACCORDANCE WITH THE METHOD,AND RECORDING MEDIUM HAVING AN INFORMATION STRUCTURE CONTAINING SEQUENCES OF BLOCKS OF BINARY CHANNEL BITS

摘要

In a run length limited block coding method in which blocks of m data bits are converted to blocks of n1 information and n2 separation bits (n = n1 + n2m). The blocks of bits satisfying the requirement of being (d, k) run length limited, the blocks of separation bits BSi between each of the blocks of n-information bits Bli are chosen, in those cases where the format is not prescribed by the (d, k)-constraint, such that the low-frequency spectrum and particularly the direct current unbalance is as low as possible. The direct current unbalance may be minimized within each block independently or cumulatively over a series of blocks. A demodulator for decoding data encoded as above is described. IMAGE