Reorganized Into Folders

src/AmpEnvelope/DarellAmplitudeEnvelope.m

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+%Written by Darell
+%Creates a Linear Amplitude Envelope 
+
+% CONTRIBUTORS:
+% Person1: Darell
+
+% DOCUMENTATION:
+% fs is the sampling frequency
+% attack, decay, release are in percentages of the period
+% sustain is in the percentage of amplitude
+
+function output = DarellAmplitudeEnvelope(input, Fs, attack,decay,sustain,release) %percentages for attack, decay, sustain, release
+    len = length(input);
+    T = (len-1)/Fs;
+    attacktime = attack * T * Fs;
+    decaytime = attacktime + decay * T * Fs;
+    sustaintime = (T - (release * T))* Fs;
+    
+    x = 0:1/Fs:T;
+    y = 0 .* x; %create zero array of y of len x
+    output = y;%create zero array of output of len x
+    tcounter = 1;
+    %attack phase
+    while tcounter <= attacktime
+        y(tcounter) = (1/attacktime) * tcounter;
+        tcounter = tcounter+1;
+    end
+    istart = tcounter;
+    while tcounter<= decaytime
+        y(tcounter) = 1 - (((1-sustain)/(decay * T * Fs)) * (tcounter - istart));
+        tcounter = tcounter+1;
+    end
+
+    while tcounter<= sustaintime
+        y(tcounter) = sustain;
+        tcounter = tcounter+1;
+    end
+    istart = tcounter;
+    while tcounter < (T * Fs)
+        y(tcounter) = sustain - ((sustain/(release * T * Fs)) * (tcounter - istart));
+        tcounter = tcounter+1;
+    end
+    
+    for counter = 1:1:len
+        output(counter) = y(counter) * input(counter);
+    end
+    
+end