This function cleans a slice of the spectrum according to the values on 'start_freq' and 'end_freq' (optional)

wav_clean.m

function [ wav ] = wav_clean( wav_in, start_freq, end_freq )
%wav_clean This function cleans a slice of the spectrum according to the
%values on 'start_freq' and 'end_freq' (optional)

    wav = wav_in;
    
    if nargin == 2
        end_freq = size(wav, 1);
    end

    for i=start_freq:end_freq
       wav(i) = 0;
    end

end