| 摘要 |
PROBLEM TO BE SOLVED: To improve a signal-to-noise ratio and phase characteristics by providing an analog/digital conversion means, a digital filter means for separating and outputting digital multiplex signals and a demodulation means. SOLUTION: An analog/digital conversion circuit (AD converter circuit) 11 converts inputted FM demodulated waves 10 from analog signals to digital signals and outputs converted digital FM demodulated waves 12 to a digital litter circuit 13. Then, the digital filter circuit 13 separates digital multiplex signal waves 14 from the inputted digital FM demodulated waves 12 by performing a digital signal processing and outputs them to a demodulation circuit 15. Further, the demodulation circuit 15 outputs bit data 16 and bit clocks 17 by demodulating the inputted digital multiplex signal waves 14. By using such a digital filter circuit 13, the signal-to-noise ratio is improved and the degradation of the phase characteristics is eliminated.
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