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| − | [[Media:Normal_Song.wav]] | + | [[Media:Normal_Song.wav]]<br> |
| − | [[Media:Twice_as_fast.wav]] | + | [[Media:Twice_as_fast.wav]]<br> |
| − | [[Media:Transformation_x(2t).wav]] | + | [[Media:Transformation_x(2t).wav]]<br> |
| − | %Megha Reddy | + | %Megha Reddy<br> |
| − | %ECE 301 | + | %ECE 301<br> |
| + | <br> | ||
| + | clear <br> | ||
| + | clc <br> | ||
| + | %Part 1 <br> | ||
| + | G_freq = 391.995;<br> | ||
| + | Bflat_freq = 466.164;<br> | ||
| + | C_freq = 523.251;<br> | ||
| + | Dflat_freq = 544.365;<br> | ||
| + | <br> | ||
| + | bpm = 112; %number of beats per minute<br> | ||
| + | beats_per_sec = bpm/60; %number of beats per second<br> | ||
| + | rev_bps = 1/beats_per_sec; %calculates the time for each beat<br> | ||
| + | <br> | ||
| + | delta = 0.00005;<br> | ||
| + | <br> | ||
| + | Q = 0:delta:1*rev_bps; %duration of a quarter note<br> | ||
| + | E = 0:delta:0.5*rev_bps; %duration of an eight note<br> | ||
| + | H = 0:delta:2*rev_bps; %duration of a half note<br> | ||
| + | DQ = 0:delta:1.5*rev_bps; %duration of a dotted quarter note<br> | ||
| + | <br> | ||
| + | G_Q = sin(2*pi*G_freq*Q); %calculates a G quarter note<br> | ||
| + | Bflat_Q = sin(2*pi*Bflat_freq*Q); %calculates a B flat quarter note<br> | ||
| + | Cdot = sin(2*pi*C_freq*DQ); %calculates a C dotted quarter note<br> | ||
| + | Dflat_E = sin(2*pi*Dflat_freq*E); %calculates a D flat eighth note<br> | ||
| + | C_H = sin(2*pi*C_freq*H); %calculates a C half note<br> | ||
| + | rest_E = zeros(E/delta,1); %calculates an eighth rest<br> | ||
| + | rest_H = zeros(H/delta,1); % calculates a half rest<br> | ||
| + | <br> | ||
| + | %puts the notes in an array to be able to play the song<br> | ||
| + | song = [G_Q,Bflat_Q,Cdot,G_Q,Bflat_Q,Dflat_E,C_H,G_Q,Bflat_Q,Cdot,Bflat_Q,G_Q,rest_E,rest_H]; <br> | ||
| + | sound(song,1/delta); <br> | ||
| + | <br> | ||
| + | %plays song two times faster<br> | ||
| + | sound(song,2/delta);<br> | ||
| + | <br> | ||
| + | %doubles the time interval for each note <br> | ||
| + | newQ = 2*Q;<br> | ||
| + | newE = 2*E;<br> | ||
| + | newH = 2*H;<br> | ||
| + | newDQ = 2*DQ;<br> | ||
| + | <br> | ||
| + | G_Q = sin(2*pi*G_freq*newQ);<br> | ||
| + | Bflat_Q = sin(2*pi*Bflat_freq*newQ);<br> | ||
| + | Cdot = sin(2*pi*C_freq*newDQ);<br> | ||
| + | Dflat_E = sin(2*pi*Dflat_freq*newE);<br> | ||
| + | C_H = sin(2*pi*C_freq*newH);<br> | ||
| + | rest_E = zeros(E/delta,1);<br> | ||
| + | rest_H = zeros(H/delta,1);<br> | ||
| + | <br> | ||
| + | %plays the song with the new time interval<br> | ||
| + | song = [G_Q,Bflat_Q,Cdot,G_Q,Bflat_Q,Dflat_E,C_H,G_Q,Bflat_Q,Cdot,Bflat_Q,G_Q,rest_E,rest_H];<br> | ||
| + | sound(song,1/delta);<br> | ||
| + | <br> | ||
| + | clear <br> | ||
| + | clc<br> | ||
| − | + | %Part 2<br> | |
| − | + | [song,Fs] = wavread('Beatles.wav'); %reads the given file and stores it in an array<br> | |
| − | + | <br> | |
| − | + | song_rev = flipud(song); %flips the array<br> | |
| − | + | <br> | |
| − | + | sound(song_rev,Fs); %plays the reversed song<br> | |
| − | + | <br> | |
| − | + | %The reverse song does contain it message, the words are not clear but it<br> | |
| − | + | %sounds like it says "turn me on dead man"<br> | |
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| − | %Part 2 | + | |
| − | [song,Fs] = wavread('Beatles.wav'); %reads the given file and stores it in an array | + | |
| − | + | ||
| − | song_rev = flipud(song); %flips the array | + | |
| − | + | ||
| − | sound(song_rev,Fs); %plays the reversed song | + | |
| − | + | ||
| − | %The reverse song does contain it message, the words are not clear but it | + | |
| − | %says "turn me on dead man" | + | |
Latest revision as of 08:48, 19 January 2011
Media:Normal_Song.wav
Media:Twice_as_fast.wav
Media:Transformation_x(2t).wav
%Megha Reddy
%ECE 301
clear
clc
%Part 1
G_freq = 391.995;
Bflat_freq = 466.164;
C_freq = 523.251;
Dflat_freq = 544.365;
bpm = 112; %number of beats per minute
beats_per_sec = bpm/60; %number of beats per second
rev_bps = 1/beats_per_sec; %calculates the time for each beat
delta = 0.00005;
Q = 0:delta:1*rev_bps; %duration of a quarter note
E = 0:delta:0.5*rev_bps; %duration of an eight note
H = 0:delta:2*rev_bps; %duration of a half note
DQ = 0:delta:1.5*rev_bps; %duration of a dotted quarter note
G_Q = sin(2*pi*G_freq*Q); %calculates a G quarter note
Bflat_Q = sin(2*pi*Bflat_freq*Q); %calculates a B flat quarter note
Cdot = sin(2*pi*C_freq*DQ); %calculates a C dotted quarter note
Dflat_E = sin(2*pi*Dflat_freq*E); %calculates a D flat eighth note
C_H = sin(2*pi*C_freq*H); %calculates a C half note
rest_E = zeros(E/delta,1); %calculates an eighth rest
rest_H = zeros(H/delta,1); % calculates a half rest
%puts the notes in an array to be able to play the song
song = [G_Q,Bflat_Q,Cdot,G_Q,Bflat_Q,Dflat_E,C_H,G_Q,Bflat_Q,Cdot,Bflat_Q,G_Q,rest_E,rest_H];
sound(song,1/delta);
%plays song two times faster
sound(song,2/delta);
%doubles the time interval for each note
newQ = 2*Q;
newE = 2*E;
newH = 2*H;
newDQ = 2*DQ;
G_Q = sin(2*pi*G_freq*newQ);
Bflat_Q = sin(2*pi*Bflat_freq*newQ);
Cdot = sin(2*pi*C_freq*newDQ);
Dflat_E = sin(2*pi*Dflat_freq*newE);
C_H = sin(2*pi*C_freq*newH);
rest_E = zeros(E/delta,1);
rest_H = zeros(H/delta,1);
%plays the song with the new time interval
song = [G_Q,Bflat_Q,Cdot,G_Q,Bflat_Q,Dflat_E,C_H,G_Q,Bflat_Q,Cdot,Bflat_Q,G_Q,rest_E,rest_H];
sound(song,1/delta);
clear
clc
%Part 2
[song,Fs] = wavread('Beatles.wav'); %reads the given file and stores it in an array
song_rev = flipud(song); %flips the array
sound(song_rev,Fs); %plays the reversed song
%The reverse song does contain it message, the words are not clear but it
%sounds like it says "turn me on dead man"
