| 摘要 |
PURPOSE:To suppress the rounding of rising and breaking waveforms of a carrier wave by connecting a couple of biasing diodes, which conducts during a transmission period, to a couple of transistors of a push-pull circuit which supplies an output to a resonating circuit. CONSTITUTION:When signals are transmitted in time-division mode between a control center and a controlled center which are each equipped with a demodulator, a logical processing circuit and a modulator, the output of the puhs-pull circuit 21 of the demodulator 5 at the control center is supplied to a resonating circuit 41, whose output is transmitted. Between the bases of a couple of transistors 25 and 26 of the push-pull circuit 21, a couple of series-connected biasing diodes 27 and 28 are connected and made to stay on and during the period, a carrier signal to be transmitted is supplied to the connection point between both the diodes. The controlled center is also provided with the same constitution to lower the selectivity of the resonating circuit, and then the rounding of rising and breaking waveforms of the carrier wave is eliminated to transmit information accurately. |
