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