H - Electricity – 03 – M
Patent
H - Electricity
03
M
354/223
H03M 13/15 (2006.01)
Patent
CA 1098212
SO1034 CODE TRANSMISSION METHOD AND APPARATUS THEREFOR ABSTRACT OF THE DISCLOSURE In code transmission, an information bit has added thereto a first redundant bit which is selected so that the result of the addition is indivisible by a generation polynomial expression even when all of the information bits are "0" to "1", and the code including the information bits and the first redundant bit is divided by the generation polynomial expression to provide a second redundant bit as the residue of such division. The second redundant bit is added to the information bit and the resultant code is transmitted. The first redundant bit is added to a received code made up of the information bit and the second redundant bit, and the resultant code is divided by the generation polynomial expression to detect the introduction of an error in the transmission path by the existence of a residue of the last division. A code transmission apparatus is also disclosed which includes a dividing circuit consisting of a shift register, adding circuits of the modulo 2 type inserted between adjacent stages of the shift register in correspondence with constants of a generation polynomial expression, and feedback path extending from the shift register output to -1- the adding circuits. The code transmission apparatus further has means for adding the first redundant bit or for presetting said first redundant bit in said shift register stage of said dividing circuit to which an information bit is applied, and means for providing the second redundant bit as the residue of a division of a code consisting of said information bit and first redundant bit by said generation polynomial expression, and means for adding the second redundant bit to the information bit to pro-ride the code to be transmitted.
303471
Gowling Lafleur Henderson Llp
Sony Corporation
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