HW1.2 Max Paganini ECE301Fall2008mboutin - Rhea

Judas Priest Lyrics

Couldn't quite get the high-pitched squealing. However, the reversed version of that Judas Priest song says "Suicide of the Mind."

Song Files

• Reversed and at normal speed
• Reversed and at about 57% normal speed

MATLAB Code

%Max Paganini
%mpaganin@purdue.edu
%Hw1.2 Song Reversal

clc;
clear;

%Open Judas Priest Song with Sample Rate (Fs) in Hz and number of bits per
%sample (nbits).
[y, Fs, nbits] = wavread('jpforward.wav');
disp('Sample Rate (Fs) in Hertz: ')
disp(Fs)
disp('Number of bits per sample (nbits): ')
disp(nbits)

%Check to see if file loaded correctly
disp('Normal Song playing now.')
wavplay(y,Fs);

%Time to reverse the file
time = size(y);
last_n = time(1);
reversed = zeros(last_n,1);

counter = last_n;
while(counter > 1)
    reversed(last_n - (counter-1),1) = y(counter);
    counter = counter - 1;
end

%Play reversed Judas Priest Song
disp('Now the creepy part.')
wavplay(reversed, Fs);
disp('Did he just say "Suicide of the Mind"???')

%Burn reversed Judas Priest song
wavwrite(reversed,Fs,nbits,'jpreversed.wav');

%Half speed slow down of the reversed song
disp('Lets listen to that in slow motion.')
wavplay(reversed, Fs/1.75);
disp('Now it sounds like the Devil is saying "Suicide of the Mind."')

%Burn slowed down reversal
wavwrite(reversed, Fs/1.75, nbits,'jpreversedslow.wav');