Matlab Script
Does Judas Priest have subliminal messages? I wrote a MATLAB script to find out:
% Brian Thomas (thomas34 _ nospam _ purdue _ edu)
% Sept. 4, 2008
% ECE301, HW#1.2
% Play a piece of music backwards, then slowly backwards
% Clear everything
clear; clc;
% Get music piece
[forwardData, sampleRate, bitsPerSample] = wavread('jpforward.wav');
datalen = length(forwardData);
% Preallocate space for backwardData. We first will be reversing
% forwardData at normal speed. (x[n] -> x[-n])
backwardData = zeros(1,datalen);
for i = 1 : 1 : datalen
backwardData(i) = forwardData(datalen - i + 1);
end
% Play the song
%wavplay(backwardData, sampleRate);
% Save song as a wav file (as this is being done remotely)
wavwrite(backwardData, sampleRate, bitsPerSample, 'jpbackward.wav');
% Preallocate space for backwardData2. We will be reversing
% forwardData and playing it at half speed. (x[n] -> x[-0.5n])
backwardData2 = zeros(1,datalen*2);
for i = 1 : 1 : datalen
backwardData2(2*i) = forwardData(datalen - i + 1);
end
% Play the song
%wavplay(backwardData2, sampleRate);
% Save song as a wav file (as this is being done remotely)
wavwrite(backwardData2, sampleRate, bitsPerSample, 'jpbackward_slow.wav');
Results
Two wav files were obtained: normal speed and slow speed.
I could not find any definite hidden messages. It seemed like he was saying "the fire of the night", but that's at most a guess.
