Synchronization apparatus for accurately demodulating signal input to pjm tag and pjm tag including the synchronization apparatus

A phase jitter modulation (PJM) tag comprising:

• an optimum signal selector dividing a signal received through a single path into a plurality of paths, obtaining values by sampling a signal of each path at a different position with respect to the position of sampling of the other paths, selecting a path which can ensure a highest demodulation performance by comparing the obtained values, and outputting a signal of the selected path;
• a quantizer quantizing the signal output from the optimum signal selector;
• a first correlator correlating a signal, which is output from the quantizer and received through a first path, with a template of an internal matched filter which is in the same form as at least a portion of an MFM flag;
• a peak detector detecting a peak from an output value of the first correlator on a bit-by-bit basis;
• second and third correlators activated after being delayed for different periods of time from when the peak was initially detected by the peak detector and correlating a signal, which is output from the quantizer and received through a second path, with a template of an internal matched filter which is in the same form as at least a portion of the MFM flag;
• a switch used to input a signal output from the quantizer to a demodulator through a third path;
• and
• a demodulation timing determiner comparing output values of the second and third correlators, waiting a period of time based on the comparison result, and shutting the switch.