Revision as of 09:42, 3 September 2008 by Pjcannon (Talk)

Sound Files

Matlab Code

%Phil Cannon 
%pjcannon@purdue.edu
%ECE301 HW1_2

%This file imports the file 'jpforward.wav' in the local directory.  It
%then plays the file forwards at 44khz, backwards at 44khz, and backwards
%at 22khz.  I found it easiest to interpret the subliminal message at
%44khz.

[x,fs,nbits]=wavread('jpforward.wav');

%Reverse the matrix array
for count=1:length(x)
    jpbackward(length(x)-(count-1))=x(count);
end

%Forwards at 44100 Hz
wavplay(x,44100)
wavwrite(x, 44100, 'Forward44k.wav');

%Backwards at 44100 Hz
wavplay(jpbackward,44100)
wavwrite(jpbackward, 44100, 'Backward44k.wav');

%Backwards at 22050 Hz
wavplay(jpbackward,22050)
wavwrite(jpbackward, 22050, 'Backward22k.wav');

Results

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