% Hail Purdue.
% XUJUN HUANG
% huang122@purdue.edu
% note durations.
% time signature = 4/4
% quarter note = 180bpm => quarter note duration is 60/180 minute.
Q=60/180;
H=2*Q; % Half note
W=4*Q; % Whole note
En=Q/2; %Eighth note
DQ=Q+En; %Dotted quarter
%frequencies
% A=440 = 5x/3 => x=264
% Middle C (do) = x = 264;
% D (re)=9x/8=297;
% E (mi)=5x/4=330;
% F (fa)=4x/3=352;
% GL (so)=3x/2/2=198;
% AL (low la)=5x/3/2=220;
% BL (low ti)=15x/8/2=247.5;
C=264;
D=297;
E=330;
F=352;
GL=198;
AL=220;
BL=247.5;
notes = [GL,GL,AL,C,D,E,E,F,F,F,C,D,E,E,... %Hail, hail to old Purdue!All hail to our old gold and black!
E,E,D,C,D,E,E,D,AL,BL,C,BL,AL,D,... %Hail, hail to old Purdue!Our friendship may she never lack,
GL,GL,GL,AL,C,D,E,E,F,F,C,D,E,... %Ever grateful ever true,Thus we raise our song anew,†
AL,BL,C,AL,GL,C,E,GL,AL,E,D,C,C]; %Of the days we've spent with you,All hail our own Purdue.
duration = [H,DQ,En,DQ,En,Q,Q,Q,En,En,Q,En,En,W,...
H,DQ,En,DQ,En,Q,Q,Q,En,En,Q,En,En,W,...
DQ,En,Q,Q,DQ,En,Q,Q,Q,Q,Q,Q,W,...
DQ,En,Q,Q,Q,Q,Q,Q,DQ,En,DQ,En,W];
% Play the song as what demonstrated in class
delta=0.00005;
PART A
for n = 1:56
t = 0:delta:duration(n);
anthem = sin(2*pi*notes(n)*t);
sound(anthem, 1/delta);
end
PART B
for n = 1:56
t = 0:delta:0.5*duration(n);
anthem = sin(2*pi*notes(n)*t);
sound(anthem, 1/delta);
end
PART C
for n = 1:56
t = 0:delta:duration(n);
anthem = sin(2*2*pi*notes(n)*t);
sound(anthem, 1/delta);
end
