| 摘要 |
PURPOSE:To transmit an input digital signal on the same line at the same time, by adding an amplitude to an input analog signal, multiplying and modulating the result by a digital signal where the maximum value of consecutive zeros is limited, and designating the digital signal as a carrier. CONSTITUTION:The input analog signal 20 is added with a prescribed amplitude generated at a DC generating circuit 22 from an addition circuit 23. The input digital signal 21 is converted into a binary digital code series where the maximum value of consecutive zeros is limited to a prescribed value at a code conversion circuit 24, multiplied and modulated at a multiplication circuit 25 by the said analog signal and transmitted to a transmission line 26. A reception signal is line-equalized at a line equalizer 27 and an output signal 33 is obtained at an analog signal extracting circuit 28. The ditital signal is shaped at a waveform equalizer 29 and discriminated at a discrimination circuit 30 by using the timing wave of a timing extraction circuit 31. This signal series is inverted for the code conversion at the transmission side with a code conversion circuit 32 and an output signal 34 is obtained. |
