用FFT计算信号的功率谱密度时，需要先计算FFT，再计算双边谱密度，然后计算单边谱密度。在matlab里注意FFt要除以采样点数，计算双边谱时要注意除以频率分辨率。 - When calculated using the FFT power spectrum density signal, you need to calculate the FFT, and then calculate the bilateral spectral density, and then calculate

这是网上搜索到的FFT的程序，适合刚开始学习FFT的朋友。介绍了采样时间，采样频率等对FFT的影响，里面有我自己的注释，希望能够帮到你.需要的请拿走，不谢。-This is the online search to FFT program for just started learning FFT friend. Describes the effects of sampling time, the sampling frequency of the FFT, which has my own