| 摘要 |
PURPOSE:To enable a reliable electric light line communication by providing exclusive OR circuits and selecting any output by using a selector according to the logic of transmission data. CONSTITUTION:A first M group generator 3 is composed of a five-staged shift register 1 and an EXOR gates 2 and 2A. The gate 2 inputs the output of the register 1 and obtains an M group code with the prescribed code length while feeding to the register 1. When the output of this register 1 is a PNO, the gate 2A inputs the output of the register 1 and a clock c to be generated by a clock generator 4, generating the Manchester-coded M group PNO. A M group generator 6 is composed of a delay device 5 consisting shift registers and an EXOR 2B, and driven by the same clock c as the generator 3, generating the M group with the phase more delayed than the PNO. The two exclusive OR circuits are provided, and one of which is selected by the selector 8 according to the logic of transmission data one bit, realizing the highly reliable electric light line communication. |
