| 摘要 |
PURPOSE:To enhance the transmission efficiency of data by converting a unipolar signal into a bipolar signal corresponding to the inputted state information so as to transmit on transmission side and controlling an envelope decomposing circuit so as to divide a data output and a state information output on reception side. CONSTITUTION:On transmission side, a frame bit generated in a frame pattern generation circuit 1 and data from a data input IN1 are envelope composed 2. Meanwhile according to the state of a state information input IN2, the frame bit is violation controlled 3 and a unipolar signal of an envelope assembly circuit 2 is converted into a bipolar signal in a unipolar-bipolar conversion circuit 4 and it is outputted. On the other hand, on reception side, an input bipolar signal is bipolar-unipoliar converted 5 and the output is violation detected 6 and envelope synchronized 7. The respective output signals are conducted to an envelope decomposing circuit 8 and the state information is reproduced based on the presence or absence of the violation of the frame bit, a state signal OUT2 is outputted, while an envelope signal is decomposed and a data output OUT1 is outputted.
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