PROBLEM TO BE SOLVED: To detect a signal sampled at optimal clock timing by a comparatively simple configuration for a pulse modulation signal having a signal width shorter than a symbol frequency.;SOLUTION: A time division unit 103 samples a data signal at a clock signal rise edge and outputs the sampled data signals to counters 104-1 to 104-3, respectively. The counters 104-1 to 104-3 count the number of High levels when the data signal becomes High level within a predetermined period, and a maximum value detection unit 105 outputs maximum data string information on a data string counted by a counter in which the maximum number of High levels has been detected among High level number in the counters 104-1 to 104-3 to a selection data judgment unit 106. The selection data determination unit 106 determines which data string sampled at a particular timing is selected as a demodulation data string.;COPYRIGHT: (C)2008,JPO&INPIT
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