| 摘要 |
PROBLEM TO BE SOLVED: To enable simple frequency measurement with precision using an FFT. SOLUTION: In the frequency measurement using the FFT, by using spectrum data y (n) at a frequency f (n) when a spectrum is a maximum, spectrum data y (n+1) at a frequency f (n+1) when a spectrum is a next maximum, and a spectrum spaceΔf, a frequency fx of an analog signal is determined by fx=f(n)+Δf×y(n+1)/äy(n)+y(n+1)}. COPYRIGHT: (C)2006,JPO&NCIPI
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