clc clear % Part 1
x = 1;
%initializes counter for iterations for i = 1:1:3 %% a loop to perform three iterations for parts a,b,c
delta = 0.00005 ; %sampling rate
if x == 2
bpm = 2*112 ;
%beats per minute for parts a and c
else
bpm = 112 ;
%beats per minute for part b
end
bps = 60/bpm ; %beats per second
rest= 0:delta:3*bps; % there is a three beat rest at the end of the song
q = 0:delta:bps ; % length of a quarter note in terms of tempo
h = 0:delta:2*bps ; % length of a half note in terms of tempo
e = 0:delta:0.5*bps ; % length of an eighth note in terms of tempo
dq = 0:delta:1.5*bps ; % length of a dotted quarter note in terms of tempo
if x==3 A_note = 2*440 ; %Pitch frequency for A4
G_note = 2^(-2/12)*A_note ; %Pitch frequency for G
Bflat_note = 2^(1/12)*A_note ; %Pitch frequency for B flat
C_note = 2^(3/12)*A_note ; %Pitch frequency for C
Dflat_note = 2^(4/12)*A_note ; %Pitch frequency for D flat
else %%changes the pitch by multiplying the A4 frequency by two
A_note = 440 ; %Pitch frequency for A4
G_note = 2^(-2/12)*A_note ; %Pitch frequency for G
Bflat_note = 2^(1/12)*A_note ; %Pitch frequency for B flat
C_note = 2^(3/12)*A_note ; %Pitch frequency for C
Dflat_note = 2^(4/12)*A_note ; %Pitch frequency for D flat
end
Gq = sin(2*pi*G_note*q) ;
%% Standard function for quarter note, G pitch
Bfq = sin(2*pi*Bflat_note*q) ; %% Standard function for quarter note, B flat pitch
Ch = sin(2*pi*C_note*h) ; %% Standard function for half note, C pitch
Cdq = sin(2*pi*C_note*dq) ; %% Standard function for dotted quarter note, C pitch
Dfe = sin(2*pi*Dflat_note*e) ; %% Standard function for eighth note, D flat pitch
smoke_song = [Gq,Bfq,Cdq,Gq,Bfq,Dfe,Ch,Gq,Bfq,Cdq,Bfq,Gq,rest];
if x==1 sound(smoke_song, 1/delta); wavwrite(smoke_song,1/delta, 'normal_smoke_on_the_water'); elseif x==2 sound(smoke_song, 1/delta); wavwrite(smoke_song,1/delta, 'fast_smoke_on_the_water'); else sound(smoke_song, 1/delta); wavwrite(smoke_song,1/delta, 'highpitch_smoke_on_the_water');
end
x=x+1;
end
%%Part 2
[song, fs] = wavread('Beatles.wav'); %Original clip says 'Number 9' repeatedly
reverse = flipud(song);
sound(20*reverse,fs); %% could not hear the song so had to amplify it
wavwrite(reverse,fs,'reverse_Beatles') %reversed clip sounds like 'Let me on, Desmond' repeatedly
Media:normal_smoke_on_the_water.wav Media:fast_smoke_on_the_water.wav Media:highpitch_smoke_on_the_water.wav Media:reverse_Beatles.wav
