Hi,
When you run the MATLAB script with:
function x = key2note(A, keynum, dur, fs)
tt = 0:(1/fs):dur-1/fs;
freq = 440 * 2^((keynum-49)/12);
x = A*cos(2*pi*freq*tt - pi/2);
You actually are creating a MATLAB function. You save it, so you can run it later and see the output. For that, you are gonna need to set some inputs, something like this:
if I have these values: A=1, keynum=50, dur=1, and fs is 1000, then I can run this command in MATLAB window for that:
>> key2note(1,50,1,1000)
Then it retuens the corresponding answer for me.
