Create distortion_filter.m

src/distortion_filter.m

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+% An audio is distorted based on the value of HIGH. Nothing of a certain
+% threshold should be played above this constant, or they are simply clipped to this 
+% value. Inspired from Meghaj_Echo.m and epic_effect_schluep.m.
+% Author: Jason Liang
+
+function y = distortion_filter(x, HIGH)
+  len = length(X);
+  X = fft(x);
+  X = fftshift(X);
+  Y = zeros(1, len);
+  
+  for ind = 1:len
+    if (X(ind) > HIGH) 
+       Y(ind) = HIGH;
+    elseif (X(ind) < -HIGH)
+      Y(ind) = -HIGH;
+    else 
+      Y(ind) = X(ind);
+    end
+  end
+  
+  Y = fftshift(Y);
+  y = ifft(Y);
+  y = real(y);
+
+end