HW1.1 Aishwar Sabesan ECE301Fall2008mboutin - Rhea

Audio Files

• purdue
• purdue x2
• purdue (2t)

• Only did the first few seconds of the song

M-File

% Aishwar Sabesan 
% M-file for playing "Hail Purdue" song
% Homework 1.1 -- ECE301

%Part (a) ---> Playing the song
delta = 0.000005;
x = 264;
C = x;
D = 9*x/8;
E = 5*x/4;
F = 4*x/3;
G = 3*x/2;
A = 5*x/3;
B = 15*x/8;
CH = 2*x;
Bb = ((B-A)/2)+A;

notes = [C, D, E, F, G, A, A, Bb, Bb, Bb, F, G, A];
times = [1, 0.5, 0.5, 0.75, 0.25, 0.5, 0.5, 0.4, 0.2, 0.2, 0.5, 0.5, 1];
purduebuff = [];
for ii = 1:length(notes)
    t = 0:delta:times(ii);
    purdue = sin(2*pi*t*notes(ii));
    purduebuff = [purduebuff; purdue(:)];
end

sound(purduebuff,1/delta);
wavwrite(purduebuff, 1/delta, 16, 'purdue.wav');
pause(7);

%Part (b)  --> Playing the song at 2x
sound(purduebuff, 2/delta);
wavwrite(purduebuff,2/delta,16,'purduex2.wav');

pause(5);

%Part (c) ---> Rescaling x(t) to x(2t)
purduebuff = [];
for nn = 1:length(notes)
    t = 0:delta:times(nn);
    purdue = sin(2*pi*2*t*notes(nn));
    purduebuff = [purduebuff;purdue(:)];
end
sound(purduebuff,1/delta);
wavwrite(purduebuff,1/delta,16,'purdue(2t).wav');

pause(3);