Hw1 ECE301S11 Zach Bright - Rhea

%Zach Bright 

%ECE 301

clc; clear all;

 % PART 1

delta = 0.00005;

for var = 1:3 %beats per minute bpm = 112;

if var ==2

   bpm=112/2;

end

% beats per second beat = bpm/60;

%Eighth note
E=0:delta:(beat/8); 

%Half note
H=0:delta:(beat/2); 

%Dotted Quarter note
Dq=0:delta:(beat*(3/8)); 

%Quarter note
Q=0:delta:(beat/4);

  %G-note Freq
G=391.995; 

%B-flat freq
Bf=466.164; 

%C freq
C=523.251; 

%D-flat freq
Df=554.365;

if var==3

G=2*G;
Bf=2*Bf;
C=2*C;
Df=2*Df;

end 
%Establish all notes used in the song %in the form of (Note Letter)_(Length Letter)_note=...
G_Q_note=sin(2*pi*G*Q);
Bf_Q_note=sin(2*pi*Bf*Q);
C_Dq_note=sin(2*pi*C*Dq);
C_H_note=sin(2*pi*C*H);
Df_E_note=sin(2*pi*Df*E);

  %Song at normal speed
smoke=[G_Q_note, Bf_Q_note, C_Dq_note, G_Q_note,Bf_Q_note, Df_E_note, C_H_note, G_Q_note, Bf_Q_note, C_Dq_note, Bf_Q_note, G_Q_note];

  %create the normal tempo sound file
if var==1

   wavwrite(smoke,1/delta,'smoke_normal.wav');

%create the fast tempo sound file elseif var==2

   wavwrite(smoke,1/delta,'smoke_fast.wav'); 

%create the high pitch sound file else

   wavwrite(smoke,1/delta,'smoke_high_pitch.wav');

end

end

% PART 2

% a) The forward meesage from the Beatles is "Number 9"

% reverse signal [Beatles_normal, Fs]=wavread('Beatles.wav');
Beatles_reverse=flipud(Beatles_normal)
wavwrite(Beatles_reverse,Fs,'backwards_Beatles')

% b) In the past I have heard that peolpe think it is saying 
% "Turn me on dead man." And because of this previous knowledge 
% it sounds like this, but had I not known this, I probably would % not be able to make anything out.

smoke_normal
smoke_fast
smoke_HighPitch
BeatlesReverse