| 摘要 |
A receiver 20 has a reference voltage generating circuit 27 for generating a reference voltage. A BPF circuit 24, by setting this reference voltage to the center value of the extracted signal, removes a noise signal by extracting, from a received-light signal, a signal in the vicinity of a carrier frequency. The absolute value circuit 25 performs full-wave rectification on the output signal of the BPS circuit 24 using that reference voltage, to use, as a detection waveform, the signal component for from a transmitter 10. The LPF circuit 26 removes the high-frequency component from the output signal of the absolute value circuit 25. |
