Method for coding and decoding blocks of data and apparatus for carrying out said coding and decoding method

Abstract

Abstract PCT No. PCT/FR89/00169 Sec. 371 Date Feb. 9, 1990 Sec. 102(e) Date Feb. 9, 1990 PCT Filed Apr. 14, 1989 PCT Pub. No. WO89/10042 PCT Pub. Date Oct. 19, 1989.The present invention relates to a method and apparatus of encoding and decoding blocks of data words. Each block has a fixed number of data words with a maximum of nbits, and a position of a data word within a block is diagonally identified by a series of absolute addresses having consecutive values. In the encoding of the data words of a block, the data words are classified into groups based on their most significant non-zero bit. Then the corresponding absolute address of each classified data word is encoded based on the absolute address of a previously encoded data word in the same class as the current classified data word and the number of data words encoded in classes less than the current classified data word since the previous encoding of a data word in the class of the current classified data word. Each data word with its ith and greater bits omitted is then transmitted along with the encoded absolute address. The encoded data words are decoded by determining the class of each encoded data word and storing, class by class, the encoded data words and their corresponding encoded addresses. The ith and greater bits of each encoded data words are reconstituted, and the encoded absolute addresses of each data word are then reconstituted into absolute addresses to reconstitute a block of data words.

Inventors

• 👤 Claude Perron
• 👤 Philippe Tourtier

Bibliographic Details