DATA SYNCHRONIZATION DETECTION METHOD

摘要

PURPOSE:To detect a preamble early in digital communication by comparing preceding and the newest coding data latched so as to detect the presence of autocorrelation of a reception signal. CONSTITUTION:A timing when a reception signal g2 is fetched by a CPU 3 is controlled by an interruption interval control means 4 connected to an interruption control terminal and two kinds of synchronizing interruption intervals are set to the interruption interval control means 4. In this case, a period of a sampling clock period t1 is a period dividing a time required for representing one symbol into 1/12. A reception preamble signal is binary-sampled at a period resulting from dividing a time slot of the preamble signal into 1/12. Then the preamble signal subjected to binary sampling is coded for each 8-bit and the arrival of the preamble signal is detected based on the autocorrelation of a code string of the preamble signal coded for each 8-bit.