% program tone1.m
% This program plays middle A over a computer speaker.
% S. Scott Moor             January 2006

% first we will set input variables for the sampling frequency (sd) and duration (dur)
 sf = 8000;
 dur = 0.5;
 % we set up the time vector that is ‘dur’ seconds long and 
 % has times every 1/sf sec.
 t = 0:1/sf:dur;
 % next we create an amplitude series for a sine wave.
 a=sin(2*pi*440*t);
 % finally we can play the tone we have created
 sound(a,sf)