| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a duty correction circuit which can correct duty ratios of a plurality of Manchester coding signals with different transmission speeds. <P>SOLUTION: The duty correction circuit includes: a symbol period judging circuit 7 for judging the transmission speed of a reception signal on the basis of a period between two consecutive rising edges or falling edges of a Manchester-coded reception signal; an edge detection circuit 2 and a counter 3 which observe a time duration of "H level" or "L level" of the reception signal; a waveform distortion detection circuit 4 for detecting a waveform distortion based on the observation result and the judgment result; and a selector 5 which corrects a waveform by inverting a reception signal during a waveform distortion generation period when any waveform distortion is detected. <P>COPYRIGHT: (C)2010,JPO&INPIT |
