| 摘要 |
PURPOSE:To improve the detection precision of a circuit error rate by providing a syndrome extractor to a receiving demodulation system device. CONSTITUTION:The error correcting decoder consisting of a branching circuit 20, register 21, syndrome extractor 22, error corrector 23, and an error rate detector 24 is provided to receiving demodulation system devices in a terminal device and a specific repeater which forms a digital radio transmission system. A signal 101 containing a digital multiplex signal and a clock signal is branched by the circuit 20 into signals 102 and 103, and the signal 103 is inputted to the syndrome extractor 22 to extract a syndrome from an error correction code. Whether an error occurs to the signal 101 or not is detected from the syndrome, and the syndrome 22 outputted by the detector 22 and a clock signal 105 are inputted to the detector 24 to detect an error rate corresponding to a specific time length and output it. Further, a correction pulse signal 107 for the signal 101 is outputted to the corrector 23. |
