function output_x = AnuragDampenTarget(x, Fs,LOW, MID, HIGH) %Dampen a range of frequencies a percentage around the target frequency %Also maintain the other frequencies so that the target is muted %percentage is expressed as a number between 0 and 1. %target is the midpoint of the frequency range to dampen %x and Fs are the signal and frequency % CONTRIBUTORS: % Anurag Jadhav: function creator % Detailed explanation goes here TARGET = MID; AreaPercentage = 0.15; len = length(x); %get length of the input F = Fs * ((-len/2) : ((len/2) - 1)) / len; lenf = length(F); Mod_Freq = fftshift(fft(x)); %Fourier Transform of the input signal output = zeros([1,lenf]); % zero array of size Mod_freq %set the bounds lowerBound = (1-AreaPercentage) * TARGET; upperBound = (1+AreaPercentage) * TARGET; %% Dampen the target frequencies and maintain the others for n = 1:lenf if ((lowerBound < abs(F(n))) && abs(F(n)) < upperBound) output(n) = 0.5; else output(n) = 1; end end %%Filter the original signal and transform filtered_Mod_Freq = fftshift(Mod_Freq .* output); output_x = real(ifft(filtered_Mod_Freq)); end