Matlab Baffled By Fft Phase Spectrum Signal Processing Stack Exchange Much better, if you're still looking for something which conveys phase information, is a graph which simultaneously portrays phase and amplitude information in the same visual manner, such as a plot where phase is encoded as hue and magnitude is encoded as brightness. I did fft of a fish's trajectory, because it looks periodic and i tried to find the frequency. however, i can't understand what does the phase spectrum below represent.
Matlab Baffled By Fft Phase Spectrum Signal Processing Stack Exchange I'm trying to calculate the spectrum magnitude and phase of a signal, but when i plot them i get pretty messy results: the signal is displayed on the right, then i have the magnitude and phase of the fft in the centre and to the left accordingly. I am trying to calculate the phase spectrum of a 2d function, $f (x,y)$, where $x$, $y$, and $f (x,y)$ are real, using matlab's fft2. thus my operation is $f (x,y)\rightarrow f (k x,k y)$. my function is such that $k x$ only has positive values and $k y$ has both positive and negative values. Multiple sources agree that you can use the fft to approximate the ctft by multiplying by the sampling interval, but only some sources state that you have to multiply by a complex exponential to correct the phase spectrum that is based on your actual start time. I am trying to take iq data from 2 sdrs and process that data in matlab. the ultimate goal is to use the goertzel algorithm to grab the magnitude phase information at a specific frequency under test.
Matlab Baffled By Fft Phase Spectrum Signal Processing Stack Exchange Multiple sources agree that you can use the fft to approximate the ctft by multiplying by the sampling interval, but only some sources state that you have to multiply by a complex exponential to correct the phase spectrum that is based on your actual start time. I am trying to take iq data from 2 sdrs and process that data in matlab. the ultimate goal is to use the goertzel algorithm to grab the magnitude phase information at a specific frequency under test. I have been trying to use the fft function in matlab and have been succesful to get the amplitude spectrum of a known signal. but when working out the phase spectrum i am unsure if its the correct output. There is no phase function that i can find in the documentation, however there is the angle function that returns the phase angle (in radians) of a complex argument. I know the fundamental frequency of my signal and therefore i also know the other frequencies for the harmonics, i have used the fft command to compute the first 5 harmonics (for which i know their frequencies). is it possible for me to find the phase with this available information?. Ft spect (version 2.0) calculates amplitude and phase spectra of an input signal with the desired frequency resolution and also filters the phase spectrum for suppressing the floating rounding off error.
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