| 摘要 |
PURPOSE:To reduce the cost by digitizing the circuit of the slave station, by using the control signal in serial binary code. CONSTITUTION:The control signal consists of the start signal a, and the signal b at 1 with the coded signal of 5-bit plus parity bit and the signal c at o. Two tones out of the start signal are picked up at the vibrating lead filter 3 for the signal received at the slave station via the amplifier 2 from the input terminal 1, opening the gate of the circuit 13 for a given time via the rectifying circuit 4 and the gate circut 7, and the signals b and c are inputted. The two tones corresponding to the coded control signals 1, 0 are fed every one bit to the serial parallel conversion circuit 11 via the BPF 8, rectifying circuit 9, and gate circuit 10 and are used as the control signal with storage. |
