frequency to time domain conversion

6 Ansichten (letzte 30 Tage)
Muhammad Ali Qadar
Muhammad Ali Qadar am 13 Mai 2014
Kommentiert: dpb am 15 Mai 2014
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
Muhammad Ali Qadar
Muhammad Ali Qadar am 15 Mai 2014
@dpb, I really can not understand whats going on, is there is no example that could show this
dpb
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.

Melden Sie sich an, um zu kommentieren.

Antworten (0)

Produkte

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by