| 摘要 |
<P>PROBLEM TO BE SOLVED: To eliminate noise at the time of data demodulation. <P>SOLUTION: Demodulation data demodulated from a received signal and a carrier extraction clock are accepted to eliminate noise from the demodulation data. Frequency counters 312, 314, and 316 count the carrier extraction clock separately depending on a state of '1' or '0' of the demodulation data in every change cycle of the demodulation data, and output the larger counts. A magnitude comparator 322 compares the count values of successive three cycles, which are obtained by the frequency counters, as past, present, and future count values. A timing counter 310 counts the carrier extraction clock in a period corresponding to the present in every change cycle of the demodulation data, and outputs a timing signal about a change timing of the demodulation data. The timing counter 310 modifies the change timing so that the present count value of the frequency counter becomes the maximum based on the comparison result of the comparison means. <P>COPYRIGHT: (C)2012,JPO&INPIT |
