| 摘要 |
PURPOSE:To obtain an inexpensive, size-reducible analog multiplex transmission system by transmitting a synchronizing signal through one transmission line at every constant period on time-division basis together with a signal obtained by making analog signals from plural transmission channels selectively into pulses. CONSTITUTION:Plural analog signal channels CH1-CHn and a reference voltage Vref from a reference power source 11 are connected to a changeover switch SWS1. A control part A for timing TM operates the SWS1 successively to open and close a gate G1, and analog signals from CH1-CHn are selected in order and made into pulses, the voltage Vref is converted as a synchronizing signal into a light signal by time division at every constant period together with the pulse signal sequence to send the signal to an optical fiber. A reception side converts the photodetected light signal into an electric signal, and a control part B for regeneration TM detects the synchronizing signal of the receive signal to open and close a gate G2 synchronously with the transmitted synchronizing signal and also operates the changeover SWS2 successively to distribute pulse signals from CH1-CHn to receiving CH1'-CHn; and they are passed through LPFs for respective receiving CHs and converted into analog signals, which are outputted. |
