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Added Target Dampen and Amplify functions

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Amplify or dampen an area around the target frequencies. It can handle dual channel audio (like the strong bassline)
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TurtleEmperorx 2021-12-09 01:30:51 -08:00
parent 343221dfc2
commit c386637809
2 changed files with 104 additions and 0 deletions
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52
src/AnuragDampenTarget.m Normal file
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function output_x = AnuragDampenTarget(x, Fs,TARGET, AreaPercentage)
%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
[dim,len] = size(x); %get length of the input
F = Fs * ((-len/2) : ((len/2) - 1)) / len;
lenf = length(F);
Mod_Freq = ifft(fft(x)); %Fourier Transform of the input signal
output = zeros([1,lenf]); % zero array of size Mod_freq
if(dim == 2) %check for dual channel audio
F = [F;F];
output = [output;output];
end
%set the bounds
lowerBound = (1-AreaPercentage) * TARGET;
upperBound = (1+AreaPercentage) * TARGET;
%% Dampen the target frequencies and maintain the others
if(dim == 2) %iterate through both channels if track is dual channel
for n = 1:lenf
if ((lowerBound < abs(F(1,n))) && abs(F(1,n)) < upperBound)
output(1,n) = 1;
else
output(1,n) = 0.5;
end
end
for n = 1:lenf
if ((lowerBound < abs(F(2,n))) && abs(F(2,n)) < upperBound)
output(2,n) = 1;
else
output(2,n) = .5;
end
end
else %iterate onnly once for monochannel
for n = 1:lenf
if ((lowerBound < abs(F(n))) && abs(F(n)) < upperBound)
output(n) = 1;
else
output(n) = .5;
end
end
end
%%Filter the original signal and transform
filtered_Mod_Freq = fftshift(Mod_Freq .* output);
output_x = real(ifft(filtered_Mod_Freq));
end

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src/AnuragEnchanceTarget.m Normal file
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function output_x = AnuragEnchanceTarget(x, Fs,TARGET, AreaPercentage)
%Amplify a range of frequencies a percentage around the target frequency
%Also damnpen the other frequencies so that the target is easier to hear
%percentage is expressed as a number between 0 and 1.
%target is the midpoint of the frequency range to amplify
%x and Fs are the signal and frequency
% CONTRIBUTORS:
% Anurag Jadhav: function creator
% Detailed explanation goes here
[dim,len] = size(x); %get length of the input
F = Fs * ((-len/2) : ((len/2) - 1)) / len;
lenf = length(F);
Mod_Freq = ifft(fft(x)); %Fourier Transform of the input signal
output = zeros([1,lenf]); % zero array of size Mod_freq
if(dim == 2) %check for dual channel audio
F = [F;F];
output = [output;output];
end
%set the bounds
lowerBound = (1-AreaPercentage) * TARGET;
upperBound = (1+AreaPercentage) * TARGET;
%% Amplify the target frequencies and dampen the others
if(dim == 2) %iterate through both channels if track is dual channel
for n = 1:lenf
if ((lowerBound < abs(F(1,n))) && abs(F(1,n)) < upperBound)
output(1,n) = 2;
else
output(1,n) = 0.75;
end
end
for n = 1:lenf
if ((lowerBound < abs(F(2,n))) && abs(F(2,n)) < upperBound)
output(2,n) = 2;
else
output(2,n) = 0.75;
end
end
else %iterate onnly once for monochannel
for n = 1:lenf
if ((lowerBound < abs(F(n))) && abs(F(n)) < upperBound)
output(n) = 2;
else
output(n) = 0.75;
end
end
end
%%Filter the original signal and transform
filtered_Mod_Freq = fftshift(Mod_Freq .* output);
output_x = real(ifft(filtered_Mod_Freq));
end