| 摘要 |
PURPOSE:To cope with the increment of the number of phases of phase modulation easily, by measuring an error rate in the receiving signal by the number of bits of disaccordant pulses in the simple error rate measuring system using a gray code. CONSTITUTION:A fault location pattern generating circuit 7 which generates an N-digit gray code and transmits it as an N-channel signal is provided in the transmission side, and a fault location pattern detecting circuit 10 which detects the disaccord between respective receiving signals of N channels and signals, which are obtained by delaying these receiving signals by one bit, and counts the number of bits of disaccordant pulses in an output, which is obtained by detecting successively the disaccord in respective detection outputs, is provided in the receiving side. An error rate of the receiving signal is measured by the number of bits of disaccordant pulses. Consequently, this system copes with the increment of the number of phases of phase modulation easily. |
