You need to weight the complex signal with the window witch is real.
For each window coefficient, multiply real part and the imaginary part by
the coefficient.
Sincerely
Thierry
"Tom" <tomdarel@xxxxxxxxx> a écrit dans le message de news:
46362dc4$0$22375$c3e8da3@xxxxxxxxxxxxxxxxxxxx
Hi,
I am familiar with computing the spectrum of a real time signal using FFT
after windowing it using a window such as hamming to increase the
resolution of the spectrum, however I need to compute the spectrum of a
complex signal, can anybody explain how to window a complex signal before
computing the FFT.
Re: FFT on RF Partial Discharge signals ...density spectrum" as well. ... I have a jpeg of the signals but I am ... the "silent" bits) and then applying an FFT will give me the ... corresponding spectrum with respect to window applied, be it hamming, ... (comp.dsp)
Re: FFT on RF Partial Discharge signals ...density spectrum" as well. ... I have a jpeg of the signals but I am ... the "silent" bits) and then applying an FFT will give me the ... corresponding spectrum with respect to window applied, be it hamming, ... (comp.dsp)
Re: Double integrated white noise ... leakage as spectral leakage will always be there if u window or not. ... If you take an FFT of white noise, then spectral leakage is immaterial -- if all samples are independent, then there will be no artificial discontinuity between the 1st sample and the Nth. ... However, if you take an FFT of colored noise, which should have some correlation between adjacent samples, then the step between the 1st and Nth samples will, indeed, splatter over the spectrum at 20dB/decade. ... (comp.dsp)
Re: Why window in time domain before FFT? ... Choose a window by trading off frequency resolution for accuracy (in ... Adjusting window width and/or zero... Define amplitude accuracy in a spectrum to spectrum sense by multiplying ... The FFT struggles from two problems, one more basic than the other. ... (comp.dsp)
Spectral analysis ... I am familiar with computing the spectrum of a real time signal using FFT... after windowing it using a window such as hamming to increase the resolution ... (comp.dsp)
