| 摘要 |
PROBLEM TO BE SOLVED: To provide a wide band realtime digital spectrum system reducing an amounts of operation. SOLUTION: A signal to be measured with a wide band is divided on frequency axes by plural band-pass filters, and the signals passed through each band-pas filter 110 are sampled by individual analog/digital converters 120 to convert them to digital signals. The analog/digital converter 120 under-samples, as needed, and the output of each converter 120 is connected to a plurality of digital downconverters 130 to divide on the frequency axes. The output of digital downconverter 130 is once stored into a memory 140, and then is directly inputted to an FFT (fast-Fourier Transform) calculation circuit 150. The output spectrum of each the FFT calculation circuit 150 is concatenated to be arranged on the frequency axes, and is then stored in a display device and a data-recording device. COPYRIGHT: (C)2007,JPO&INPIT
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