| 摘要 |
PURPOSE:To detect a transmission frame and transmission error correctly even when a flag pattern is not correctly transmitted because of fault of line on a transmission line by transmitting a transmission frame at a prescribed period and matching the period at a digital signal receiver side in a facsimile device. CONSTITUTION:A transmission frame synchronism clock generating circuit 31 generates a transmission frame synchronism clock at a digital signal transmitter A at first. When a data to be transmitted is generated from a data generating source 30, the data is sectioned by each prescribed bit number and the data is transmitted in response to the clock transmitted from a transmission frame synchronism clock generating circuit 31. On the other hand, a transmission frame synchronism clock generating circuit 34 of a digital signal receiver B supervises always the reception data so as to confirm that the transmission frame synchronism data is received. Moreover, the transmission frame synchronism clock generating circuit 34 outputs a control signal of the transmission frame reception to a transmission error detection circuit 35 and a data separation circuit 36. |
