Update README.md

added more concrete template to help people get started

README.md

@@ -2,18 +2,56 @@
 
  Audio synthesizer project created by ECE 45 students, written using the MATLAB language and MATLAB GUI
  
+ ## Contributors
  Will add member names shortly
  
  ## Function Prototypes
- 
+Templates to create your own functions.
-function x = generate_wave(amplitude, frequency, phase, fs, duration, duty)
+
- 
+ ### Wave generating function
-fuction x = envelope(input, fs, period, attack , decay, sustain, release)
+```
+function x = generate_WAVENAME(amplitude, frequency, phase, fs, duration, duty)
+% GENERATE_WAVENAME: returns a matrix of sampled WAVENAME wave
+
+% CONTRIBUTORS:
+% Person1: how you contributed
+% Person2: how you contributed
+% etc
+
+% DOCUMENTATION:
+% phase shift is in number of periods
+% fs is the sampling frequency: how many sample points per second
+% duration is time in seconds
+% duty is a number between 0 and 1
+
+    % initialize local variables from input arguments
+    n = fs * duration; % number of samples (length of matrix)
+    dt = 1 / fs; % sampling period: time between two sample points
+    
+    % initialize a one dimensional zero matrix to be populated
+    x = zeros(1, n);
+    
+    % populate the matrix
+    for i = 1:n
+        YOUR CODE HERE
+    end
+end
+```
+NOTE: duty does not apply to some functions (such as sinusoids)
+
+ ### Envelope function
+```
+function x = envelope(input, fs, period, attack , decay, sustain, release)
+```
 where attack, decay, release are percentages between 0 to 1 of the period
 sustain is the percentage of the amplitude it should sustain for
 **envelope can be pitch or amplitude envelope**
 
+
+### Filter function
+```
 function  output_timedomain = Filter(input_soundin_timedomain, Fs, LOW, MED, HIGH) 
+```
 where LOW, MED, HIGH are user-selected variables of any value. 
 **output should be in time domain for all functions (new sound)**