| 摘要 |
PURPOSE:To realize a change of speed of transmission, by turning on and transmitting the control signal at the transmitting side when the signal in the data region is significant and fetching the signal in the data region after regarding it significant when the control signal is turned on at the receiving side. CONSTITUTION:At a transmitting station A, the series transmitting data DS is supplied to an SP converter 3 by the timing pulse (a) and then converted into a parallel data signal (b) to be supplied to a multiplexing part 5. At the part 5, the data information signal D1 including the signal (b) and the control signal (c) is multiplexed along with another signal D2 and a sound signal S1, etc. to be transmitted in the form of a transmitting frame signal (d). At the receiving side, the signal (d) is supplied to a clock extracting circuit 6, a receiving timing circuit 7 and an SP converter 8 respectively. On the other hand, the control signal in the transmission channel of the signal (d) is extracted at an AND gate 10 and by the latch timing signal (e) given from a circuit 7 to be applied a speed converting circuit 9 in the form of the latch timing signal (h). The signal (h) is set at a high level only when the control signal is on, and an output (f) of the converter 8 is fed into the circuit 9. |
