MATLAB Code to Play Hail Purdue
%Zachary Curosh
%ECE 301, Homework 1.1
%9/5/2008
clear;
clc;
%We were given the fact that an A is 440 Hz. Using the equations given on
%the homework sheet, I was able to calculate the other notes needed.
x=440*3/5;
UpperC=2*x;
B=15*x/8;
A=440;
G=3*x/2;
F=4*x/3;
E=5*x/4;
D=9*x/8;
MiddleC=x;
%The length of notes are defined below
delta = 1/20000;
eigth = .125; %Eigth Note
quarter = .25; %Quarter Note
half = .5; %Half Note
threequarter = .75; %Three Quarters Note
whole = 1; %Whole Note
%I got the following notes to Hail Purdue from a couple of websites.
H_Purdue = [E, F, G, A, B, UpperC, UpperC, D, D, D, A, B, B, UpperC];
Timing = [half, quarter, quarter, quarter+eigth, eigth, quarter, quarter, ...
quarter, eigth, eigth, quarter, eigth, eigth, half+quarter];
%Now, to play the song at normal speed
c1=1;
for lcv=1:14
t=0:delta:Timing(lcv);
x=sin(2*pi*t*H_Purdue(lcv));
c2=1;
while c2<length(x)
HailPurdue(c1)=x(c2);
c1=c1+1;
c2=c2+1;
end
end
sound(HailPurdue,1/delta);
pause(3);
%Now play the song twice as fast
c1=1;
for lcv2=1:14
t2=0:delta:0.5*Timing(lcv2);
y=sin(2*pi*t2*H_Purdue(lcv2));
c2=1;
while c2<length(y)
Hail.Purdue.twice(c1)=y(c2);
c1=c1+1;
c2=c2+1;
end
end
sound(Hail.Purdue.twice,1/delta);
pause(3);
%Now play the song rescaled y(t)=x(2t)
c1=1;
for lcv2=1:14
t2=0:delta:Timing(lcv2);
z=sin(2*pi*t2*2*H_Purdue(lcv2));
c2=1;
while c2<length(z)
Hail.Purdue.rescale(c1)=z(c2);
c1=c1+1;
c2=c2+1;
end
end
sound(Hail.Purdue.rescale,1/delta);
%now to write each of the songs to a file
wavwrite(HailPurdue,20100,32,'Hail_Purdue_normal.wav');
wavwrite(Hail.Purdue.twice,20100,32,'Hail_Purdue_faster.wav');
wavwrite(Hail.Purdue.rescale,20100,32,'Hail_Purdue_rescaled.wav');
Sound Files
Media:Hail_Purdue_normal_ECE301Fall2008mboutin.wav
