1. 1

clc clear

fA = 440; %frequency of the 4th A note on a keyboard

delta = 0.00005 %timestep

tempo = 112/60;  %beats per second H = 0: delta: 2/tempo; %a half note is 2 beats Q = 0: delta: 1/tempo; %a quarter note is 1 beat E = 0: delta: 1/(2*tempo); %an eighth note is half a beat DQ =0: delta: 3/(2*tempo); %a dotted quarter note is 1 and 1/2 beats


QG = sin(2*pi*((2^(-2/12))*fA)*Q); %frequency of the G note is 2 half steps lower than A and is a quarter note

QBflat = sin(2*pi*((2^(1/12))*fA)*Q); %frequency of the bflat is 2 half steps above A and is a quarter note

DQC = sin(2*pi*((2^(3/12))*fA)*DQ); % C is 3 half steps above A and is a dotted quarter note

EDflat = sin(2*pi*((2^(4/12))*fA)*E); %frequency the dflat is 4 half steps above A and is an eighth note

HC = sin(2*pi*((2^(3/12))*fA)*H); %half note C

smoke = [QG, QBflat, DQC, QG, QBflat, EDflat, HC, QG, QBflat, DQC, QBflat, QG];

%number 1, section 1 tempo = 112/60;  %beats per second H = 0: delta: 2/tempo; %a half note is 2 beats Q = 0: delta: 1/tempo; %a quarter note is 1 beat E = 0: delta: 1/(2*tempo); %an eighth note is half a beat DQ =0: delta: 3/(2*tempo); %a dotted quarter note is 1 and 1/2 beats


QG = sin(2*pi*((2^(-2/12))*fA)*Q); %frequency of the G note is 2 half steps lower than A and is a quarter note

QBflat = sin(2*pi*((2^(1/12))*fA)*Q); %frequency of the bflat is 2 half steps above A and is a quarter note

DQC = sin(2*pi*((2^(3/12))*fA)*DQ); % C is 3 half steps above A and is a dotted quarter note

EDflat = sin(2*pi*((2^(4/12))*fA)*E); %frequency the dflat is 4 half steps above A and is an eighth note

HC = sin(2*pi*((2^(3/12))*fA)*H); %half note C

smoke = [QG, QBflat, DQC, QG, QBflat, EDflat, HC, QG, QBflat, DQC, QBflat, QG];

sound(smoke, 1/delta)

wavwrite(smoke, 1/delta,'hw1_section1')

Media:hw_1section1.wav

%number 1, section 2

tempo = 2* (112/60);  %beats per second H = 0: delta: 2/tempo; %a half note is 2 beats Q = 0: delta: 1/tempo; %a quarter note is 1 beat E = 0: delta: 1/(2*tempo); %an eighth note is half a beat DQ =0: delta: 3/(2*tempo); %a dotted quarter note is 1 and 1/2 beats


QG = sin(2*pi*((2^(-2/12))*fA)*Q); %frequency of the G note is 2 half steps lower than A and is a quarter note

QBflat = sin(2*pi*((2^(1/12))*fA)*Q); %frequency of the bflat is 2 half steps above A and is a quarter note

DQC = sin(2*pi*((2^(3/12))*fA)*DQ); % C is 3 half steps above A and is a dotted quarter note

EDflat = sin(2*pi*((2^(4/12))*fA)*E); %frequency the dflat is 4 half steps above A and is an eighth note

HC = sin(2*pi*((2^(3/12))*fA)*H); %half note C

smoke = [QG, QBflat, DQC, QG, QBflat, EDflat, HC, QG, QBflat, DQC, QBflat, QG];

sound(smoke, 1/delta) wavwrite(smoke, 1/delta,'hw1_section2')

Media:hw_1section2.wav

%number 1, section 3

tempo = 112/60;  %beats per second H = 0: delta: 2/tempo; %a half note is 2 beats Q = 0: delta: 1/tempo; %a quarter note is 1 beat E = 0: delta: 1/(2*tempo); %an eighth note is half a beat DQ =0: delta: 3/(2*tempo); %a dotted quarter note is 1 and 1/2 beats


QG = sin(2*2*pi*((2^(-2/12))*fA)*Q); %frequency of the G note is 2 half steps lower than A and is a quarter note

QBflat = sin(2*2*pi*((2^(1/12))*fA)*Q); %frequency of the bflat is 2 half steps above A and is a quarter note

DQC = sin(2*2*pi*((2^(3/12))*fA)*DQ); % C is 3 half steps above A and is a dotted quarter note

EDflat = sin(2*2*pi*((2^(4/12))*fA)*E); %frequency the dflat is 4 half steps above A and is an eighth note

HC = sin(2*2*pi*((2^(3/12))*fA)*H); %half note C

smoke = [QG, QBflat, DQC, QG, QBflat, EDflat, HC, QG, QBflat, DQC, QBflat, QG];

sound(smoke, 1/delta) wavwrite(smoke, 1/delta,'hw1_section3')

Media:hw_1section3.wav

  1. 2

clear all clc


[x,f] = wavread('Beatles.wav');  %wavread function to read the beatles file %sound(x,f); if this were not commented the file would play in the way it %was intended to be played originally y = flipud(x);  %the new variable y acts as a function within flipud to play the song backwards sound(y,f); %plays the song in reverse because of the change of variables wavwrite(y,f,'Backwards Beatles')

Media:Backwards Beatles.wav

%in forward play, the lyrics are "number nine, number nine, etc..." but in %reverse, the lyrics sound like "bring me on demand" however, internet %sources say it is supposed to sound like "turn me on dead man."

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EISL lab graduate

Mu Qiao