G - Physics – 06 – F
Patent
G - Physics
06
F
354/133, 354/227
G06F 7/02 (2006.01) H04J 3/12 (2006.01) H04L 1/08 (2006.01) H04L 1/18 (2006.01) H04Q 1/39 (2006.01)
Patent
CA 1161168
PHN. 9548 22 ABSTRACT: A method by which code words in a received digi- tal bit stream can be detected in a reliable manner, without word synchronization, in an environment where the bit error rate is high. The bit stream is divided into data blocks having a number of bits equal to the number of bits of the code word. The number of times that the same bit state is detected in a plurality of blocks in the same relative position in the data block is accumulated. For each bit position the accumulated value is compared with a threshold value and when the threshold value for each bit position is exceeded, the code word is detected from the digital state of the accumulated value. The cyclic permutation of the bits of the code word and the code word itself represent one an the same message. In a device using this method, bit counter feeds a word counter with the bit stream applied at an output, a shift register receiving each data block as effectively formed by the word counter. Counters count the "1" and "0" occurrences in each shift register section in successive data blocks. Threshold devices pro- vide outputs when their thresholds as given by generators are exceeded. The outputs are gated by combinational o logic gates to record a detected code word in a register which addresses a store to find the associated message.
357379
Koninklijke Philips Electronics N.v.
Van Steinburg C.e.
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