Filtering PWM in MATLAB
Started by ●July 6, 2009
Hello all. I am relativele new to using MATLAB for DSP related work, and I am
looking for some direction/help. I am attempting to model a PWM signal, and how
the output would look after passing through a filter. I can creat the PWM
signal with out a problem. My problem comes when I see the effect a low pass
filter would have(just an example). What I am currently doing is I find the
FFT, and then multiply it by the amplitude of the filter. I then take that
result and do an ifft. This seems like it should work, but I am not getting
what I expect. For example a PWM signal representing a sinewave does not give
me a sinewave after the ifft.