| 摘要 |
PURPOSE:To detect the interference quantity of radio wave frequency with a simple constitution by receiving a composite signal of a voice signal and a digital signal, detecting the jitter quantity of the digital signal and detecting an interference value related to a prescribed function by the input of the jitter quantity. CONSTITUTION:A voice signal and a digital signal having different frequency bands are inputted to input terminals 11, 12 respectively and composed by a composing circuit 13 and the composite signal is transmitted from a transmitter 14. A receiving circuit 31 receives the composite signal of the voice and digital signals and an HPF32 and a LPF34 select the voice signal and the digital signal respectively. The digital signal is inputted to a data signal deciding circuit 35 and a received data signal is outputted from a terminal. The digital signal is also inputted to a jitter measuring circuit 37 and the jitter quantity detected by the circuit 37 is inputted to a data conversion circuit 38. The circuit 38 outputs the interference quantity of radio wave frequency having the relation of a fixed function to the jitter quantity from a terminal 39. |
