PURPOSE: To surely take synchronism only by digital processing by sampling a partial pulse string of length equal to the sum of the word length of frist information and second information and unit word length from the pulse string of a frame on which a guard section is attached.
CONSTITUTION: A sampling means 11 samples a continuous partial pulse string of length equal to the sum of the word length of the first information including the forefront of an individual frame and the second information including the end of the frame and the unit word length that is the one of a signal section from the pulse string representing the frame with a phase designated from the outside sequentially. A phase rough adjusting means 13 holds the phase based on size relation between the correlation values and the threshold values of the pulse string representing the guard section at a reception terminal confronting via a transmission line and the pulse string to be qualified in one terminal of which the forefront and the end of the above stated partial pulse string are included, respectively and with length less than the sum of the word length of the first information and that of the second information, or shifts the phase in a direction of fixed value less than the word length.
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