| 摘要 |
PURPOSE:To transmit the digital signal between optional signal transmitters, by providing a transmission timing pulse generating means and a reception timing pulse generating means. CONSTITUTION:When a cascade synchronous control circuit 9 detects an off- hook accompained with no call signal of a control signal transmitter/receiver 8, a switch 9a is cut off. At the same time, a transmission timing pulse generating circuit 5 produces the transmission timing pulse. Thus the input signal receives a conversion of speed through a transmission digital converting circuit 4 and is delivered to a transmission terminal 3. While the signal given from a transmitter of the remote side is recevied by the timing signal of a reception timing pulse generating circuit 6 and delivered in the form of a digital signal. When the transmitter is used at the called side, the switch 9a is closed. As a result, the circuit 5 produces the transmission timing pulse synchronously with the reception timing pulse. |
