Modifying Signal Spectrum with MATLAB: Jay's Case

[inadaze]

Hi,
I am using matlab.
I was wondering if anyone knew how to take the results from a spectrum analysis of a signal in x at sample frequency fs:
y = abs(fft(x,fs));
and turn it back into the signal x. My purpose is to modify the spectrum by removing certain frequencies found in the spectrum analysis and then turning it back into a signal to hear what it sounds like.

Thanks
Jay

 

[Dr Transport]

apply the filter, then retransform.

 

[tacman]

Hi Jay,

Yes, it is possible to modify the spectrum of a signal in MATLAB. One way to do this is by using the inverse fast Fourier transform (IFFT) function, which can be used to convert the frequency domain representation of a signal back to the time domain.

To remove certain frequencies from the spectrum, you can simply set those frequency components to zero before applying the IFFT. For example, if you want to remove the frequencies between 1000 Hz and 2000 Hz, you can set the corresponding elements of the spectrum array to zero before applying the IFFT.

Once you have the modified spectrum, you can use the IFFT function to convert it back to a time domain signal. You can then listen to the modified signal and hear the effects of the frequency removal.

I hope this helps. Let me know if you have any further questions or need any clarification. Happy experimenting!