METHOD FOR ENCODING SEQUENCE OF DIGITAL DATA WORD OF 16 BITS TO SEQUENCE OF CODE WORD OF 17 BITS

摘要

PROBLEM TO BE SOLVED: To encode the 16 bits data to the 17 bits data by directly mapping an inputted byte to a code word separated by a central bit of a unit value. ;SOLUTION: The bit is positioned and labeled in a block 52 so that the bit position of A byte becomes symmetrical with the bit position of B byte related to the central bit C inserted in an encoding process. A logic and control block 54 logical tests the A, B bytes according to a prescribed rule. When the C bit is set in 1, when the A, B bytes are in a prescribed coding limit condition, they are outputted through a multiplexer 56 and an output circuit 17 without encoding causing as a result. When one among three encoding processes is induced, the C bit is set in 0, and when the A byte violates the coding limit condition, an Enc₁ (A) coder 58 encoded the A byte to output as a P byte, and on the other hand, it outputs the B byte as a Q byte.;COPYRIGHT: (C)1997,JPO