| 摘要 |
PURPOSE:To attain radio line supervisory and control with high accuracy by transmitting a digital signal for control after applying the signal with frequency multiplexing extracting the control signal at a receiving side and transmitting the signal simultaneously with a voice signal for attining the control. CONSTITUTION:Control information is coded into a control data and also into a correcting code at an error correcting coder 2 and they are transmitted. A reproducing digital signal is decoded into the original control data at an error correcting code decoder 11 at a receiving side. The decoder 11 generates and outputs a syndrome series, and also a control data and a clock pulse synchronized with the syndrome series. A High probability measuring device 15 counts a pulse corresponding to a prescribed time length, its measured value is compared with a data Sref 17 being an estimated value of a prescribed voice transmission quality at a comparator 18, and when the measured value is larger, it is regarded as being deteriorated and the result is outputted to an estimated data output terminal 19. Thus, the radio line supervisoty control is attained with high accuracy. |
