periodogram是用来计算功率谱密度的，参数中，X：所求功率谱密度的信号；window：所使用的窗口，默认是boxcar，其长度必须与x的长度一致；nfft：采样点数；fs：采样频率。例如：Fs=1000;n=0:1/Fs:1;x=cos(2*pi*40*n)+3*cos(2*pi*100*n)+randn(size(n));nfft=1024;window=boxcar(length(n)...
nff 是FFT变换的系数长度，比如1024,window是X的分帧长度，要小于或者等于nff，一般等于nff,overlap是帧重叠的长度，要<= 1/2 * nff, 取1/4 * nff 就可以了。
Green line is the result of a real time FFT done with 1024 points. Purple line is the averaged FFT (exponential filtering done on power of each frequency). Blue line is a copy of what the purple line was when the user froze the display the last time. ...
In this case, we obtained a speed-up of 380 for a data length of 1024. However, the results are different for the convolution module; the HW solution (Table 3) does not improve the SW solution considerably (speedup of 1.2). As we can see, a constant value of this magnitude is ...
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但是通过初步的实现,虽然实现了FFT,IFFT。不过效率实在感人,MATLAB 1024*1024大小的数据FFT+IFFT只要0.06秒左右,而我的1024*16大小的数据都需要28秒。实在感觉到自己写了一个假得不能再假的代码,不过我各种使用Vector, 完全没有考虑到代码执行的效率。看到师兄写的FFT,自己现在...
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Green line is the result of a real time FFT done with 1024 points. Purple line is the averaged FFT (exponential filtering done on power of each frequency). Blue line is a copy of what the purple line was when the user froze the display the last time. A test tone at 1kHz or a whit...