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 ;
%%changes the pitch by multiplying the A4 frequency by two
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
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
