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Matlab function that takes an audio file and filters it in the frequency domain through a...

Matlab function that takes an audio file and filters it in the frequency domain through a highpass and lowpass filter. I have to do this using the Matlab FFT function to transform into the frequency domain, filter it, then transform it back using the Matlab IFFT function. The process has to use the overlap-add method as well. I was hoping to get an idea of what I am meant to be doing here. Thanks for the help!

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