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The backward message is "Let me on Dead man" | The backward message is "Let me on Dead man" | ||
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Revision as of 19:06, 17 January 2011
Krishna Jhajaria
ECE 301 Homework 1
1. Matlab Code
for X=1:3
if X==2
BPS=112/120;
else
BPS=112/60;
end
if X==3
A4=440*2;
else
A4=440;
end
Delta=.00005;
One=0:Delta:BPS;
Half=0:Delta:BPS/2;
Quarter=0:Delta:BPS/4;
Eighth=0:Delta:BPS/8;
Dotted_Q=0:Delta:BPS*.375;
G_Q = sin(2*pi*(2^(-1/6)*A4)*Quarter);
Bf_Q = sin(2*pi*(2^(1/12)*A4)*Quarter);
C_DQ = sin(2*pi*(2^(1/4)*A4)*Dotted_Q);
Df_E = sin(2*pi*(2^(1/3)*A4)*Eighth);
C_H = sin(2*pi*(2^(1/4)*A4)*Half);
G_H = sin(2*pi*(2^(-1/6)*A4)*Half);
notes=[G_Q, Bf_Q, C_DQ, G_Q, Bf_Q, Df_E, C_H, G_Q, Bf_Q, C_DQ, Bf_Q, G_Q];
if X==1
wavwrite(notes, 1/Delta, 'regular');
elseif X==2
wavwrite(notes, 1/Delta, 'fast');
else
wavwrite(notes, 1/Delta, 'high');
end
end
2. Hidden Message
[Notes, Fs, Bits] = wavread('Beatles.wav');
Reverse = flipud(Notes);
wavwrite(Reverse,Fs, 'Beatles_Reverse');
The forward message is "Number 9"
The backward message is "Let me on Dead man"
