added amplifier function

src/Main_test.asv

@@ -0,0 +1,38 @@
+%Basic Example test 
+%Written by Darell
+amplitude = 1;
+frequency = 200;
+phase = 0;
+fs = 44800;
+duration = 1;
+duty = 0;
+
+%example Sine Generation
+x = generate_sine(amplitude, frequency, phase, fs, duration, duty);
+x = x + generate_sine(amplitude, (frequency+5), phase, fs, duration, duty);
+
+size(x)
+
+%play over 5 counts, should hear both frequencies, 5 beats per second between the 2 frequencies
+playtime = 5;
+play_continuous(x, fs, playtime)
+
+LOW = 0;
+HIGH = frequency + 1;
+MED = "unused";
+x = DarellbandpassFilter(x,fs,LOW,MED,HIGH);
+
+%play over 5 counts, should only hear 200hz
+playtime = 5;
+play_continuous(x, fs, playtime)
+
+attack = 0.2;
+decay = 0.2;
+sustain = 0.2;
+release = 0.1;
+
+x = DarellAmplitudeEnvelope(x, fs, attack,decay,sustain,release); %output new sound in time domain
+%play over 5 counts, should only hear 200hz
+playtime = 5;
+play_continuous(x, fs, playtime)
+

src/Main_test.m

@@ -11,6 +11,8 @@ duty = 0;
 x = generate_sine(amplitude, frequency, phase, fs, duration, duty);
 x = x + generate_sine(amplitude, (frequency+5), phase, fs, duration, duty);
 
+size(x)
+
 %play over 5 counts, should hear both frequencies, 5 beats per second between the 2 frequencies
 playtime = 5;
 play_continuous(x, fs, playtime)

src/amplify.m

@@ -0,0 +1,5 @@
+function output = amplify(input, multiplier)
+    %Amplifies the signal by multiplier
+    %By Conner Hsu
+    output = input*multiplier;
+end