frequency to time domain conversion
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hi,
I have some data in text file, I want to read that data and convert the data from frequency to time domain. the data is like this
Frequency [Hz] Current(A)
1.000000000000E+07 2.500234034000E-06
1.018679245283E+07 2.546990258195E-06
1.074716981132E+07 2.687277097052E-06
1.149433962264E+07 2.874370653929E-06
1.242830188679E+07 3.108313963777E-06
1.336226415094E+07 3.342348535650E-06
I already tried the Wizard, load, fopen , fread, textscan,
suggestion please
5 Kommentare
dpb
am 15 Mai 2014
Any text on the FFT or tutorial on the internet. The problem is that if you have only the PSD of a real time signal you've lost the underlying phase data and therefore have no way of regenerating the original time history any longer. You just don't have enough information left on hand.
The math is such that to generate a real output from the IFFT the input must be complex conjugate symmetric and you have no imaginary component from which to build a meaningful conjugate as the PSD is the amplitude-only result of the FFT; the phase has been mushed out.
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