Fence
Effect in FFT Spectrum |

. N = T/dt = T.fs

. Xs(fi) £¬ fi = i.fs/N , i = 0£¬1£¬2£¬.....£¬N/2

. 0Hz, 4.88Hz, 9.76Hz,...............2500

. 0Hz, 5Hz, 10Hz,...............2560

**The applet
can produces a sine signal, then shows its FFT spectrum and a zoom continue
Fourier spectrum. You can see the fence effect of FFT by compare of them.**
**Java Learning Program**

Fence
Effect in FFT |

Usage:
1.Input Frequency, Amplitude and phase of a sine signal. 2.Press "Generate" to produce this signal and show its spectrum, 3.Change a sample frequency that has spectrum line on the signal frequency, Press "Generate" to produce the signal and show its spectrum again. |

.¡£