G - Physics – 11 – C
Patent
G - Physics
11
C
354/227
G11C 29/00 (2006.01) G06F 11/00 (2006.01) H04L 1/24 (2006.01)
Patent
CA 1074920
A B S T R A C T In a method of error detection in a digital system, it is known to receive from a transmitter a serial pattern of digits in which each digit, as transmitted, is a predetermined function of two or more digits each preceding that digit by a particular spacing in the pattern, and to compare a digit in the received pattern with the combination, in accordance with the said predetermined function, of two or more digits preceding that digit by the said particular spacing in the received pattern and to generate an error indication when there is no correlation. In this invention, the comparison is repeated for succeeding particular digits in the received pattern whilst omitting for use as the particular digit one or more digits in every n (where n is an integer greater than two). The fact that not every digit in the received sequence is used as the particular digit provides a simplification of the circuitry required. Every third digit in the received pattern may be taken as the particular digit and the received pattern may be a pseudo-random binary sequence of maximal length. Circuitry to implement the method may comprise shift-registers, means to divide digits between the shift registers and modulo-2 adders.
278149
Na
Post Office (the)
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