d=5;   %distance 
h=0.1; %head radius
Fs=44100;
Ft=600;
note=tonegen(Ft, Fs, 0.10);
note=note+tonegen(Ft*2, Fs, 0.1);

%Speed of sound
Vs=350; %m/s
ln=length(note);
%Cosine rule constants
b2c2=d^2 + h^2;
b2c=2*d*h;

for theta=-pi:pi/20:pi
   %Calculate path differences
   lp= b2c2+b2c*cos((pi/2)+theta);
   rp= b2c2+b2c*cos((pi/2)-theta);
   %Calculate sound travel times
   lt= lp/Vs;
   rt= rp/Vs;
   %How many samples is this at sample rate Fs
   ls= round(Fs*lt);
   rs= round(Fs*rt);
   %Handle each side separately
   if(rs>ls)  %right is further
    df=rs-ls;
    left=[note, zeros(1,df)]/ls;
    right=[zeros(1,df),note]/rs;
   else        %left is further
    df=ls-rs;
    left=[zeros(1,df),note]/ls;
    right=[note, zeros(1,df)]/rs;
   end
   %Create the output matrix
   audio=[left;right];
   soundsc(audio, Fs);
   pause(0.1);
end