| 摘要 |
PURPOSE:To correctly obtain the timing of data brought to multivalued FM demodulation even in the case there are many noises by detecting the receiving data obtained by a binary frequency modulation(FM) demodulator by a unique word(UW) detecting circuit. CONSTITUTION:A bit timing extracting circuit 4 outputs a clock 104 being a bit timing of receiving data 103. A binary FM demodulator 9 uses this clock 104 and executes a binary frequency demodulation from a signal 102, and outputs receiving data 106. A UW detecting circuit 5 detects a UW 202 of a burst signal 200 from in the receiving data 106, and outputs a timing signal 105 for showing the timing for starting the data 203. In such a way, even in the case there are many noises, the timing of data brought to multivalued FM demodulation can be obtained correctly, and the data can be demodulated correctly. |
