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| − | + | ==Matlab Code== | |
| − | + | <pre> | |
| − | + | %Dan Morris | |
| + | %drmorris@purdue.edu | ||
| + | %EE 301 Hw1.1 | ||
| − | + | clear;clc; | |
| − | + | %define sampling rate as 20 kHz | |
| − | + | delta=1/20000; | |
| − | + | %now define the duration of each note, take quater note (q) to be 172 bpm. | |
| − | + | q=60/172; %quater | |
| − | + | h=2*q; %half | |
| − | + | w=4*q; %whole | |
| − | + | e=q/2; %eighth | |
| − | + | dotq=3/2*q; %dotted quater | |
| − | + | doth=3*q; %dotted half | |
| − | + | %now define the note frequencies | |
| − | + | x=3/5*440; %(440=5x/3 => x=3*440/5 => x=264) | |
| − | + | A=5/3*x; | |
| − | + | B=15/8*x; | |
| − | + | C=x; | |
| − | + | D=9*x/8; | |
| − | + | Db= 277.18; | |
| − | + | E=5/4*x; | |
| − | + | F=4/3*x; | |
| − | + | G=3/2*x; | |
| − | + | Gb= 369.99; | |
| − | + | %now to define the song using arrays | |
| − | + | notes=[A,B,Db,D,E,Gb,Gb,G,G,G,D,E,F,Gb]; | |
| − | + | duration=[h,q,q,dotq,e,q,q,q,e,e,q,e,e,doth]; | |
| − | + | %A) now to play the song at normal speed | |
| − | + | for n=1:length(notes) | |
| − | + | time=1:delta:duration(i); | |
| − | + | song=sin(2*pi*notes(i)*time); | |
| − | + | sound(song, 1/delta); | |
| − | + | end | |
| − | + | pause(3) | |
| − | + | %B) now to play the song at twice as fast | |
| − | + | for n=1:length(notes) | |
| − | + | time=1:delta:0.5*duration(i); | |
| − | + | song=sin(2*pi*notes(i)*time); | |
| − | + | sound(song, 1/delta); | |
| − | + | end | |
| − | + | pause(3) | |
| − | + | %C) now play the song x(t) scaled to y(t) = x(2t) | |
| − | + | for n=1:length(notes) | |
| − | + | time=1:delta:duration(i); | |
| − | + | song=sin(2*2*pi*notes(i)*time); | |
| − | + | sound(song, 1/delta); | |
| − | + | end | |
| + | </pre> | ||
| + | |||
| + | ==Comments== | ||
| + | I don't know how to upload the sound file. | ||
Latest revision as of 13:08, 4 September 2008
Matlab Code
%Dan Morris
%drmorris@purdue.edu
%EE 301 Hw1.1
clear;clc;
%define sampling rate as 20 kHz
delta=1/20000;
%now define the duration of each note, take quater note (q) to be 172 bpm.
q=60/172; %quater
h=2*q; %half
w=4*q; %whole
e=q/2; %eighth
dotq=3/2*q; %dotted quater
doth=3*q; %dotted half
%now define the note frequencies
x=3/5*440; %(440=5x/3 => x=3*440/5 => x=264)
A=5/3*x;
B=15/8*x;
C=x;
D=9*x/8;
Db= 277.18;
E=5/4*x;
F=4/3*x;
G=3/2*x;
Gb= 369.99;
%now to define the song using arrays
notes=[A,B,Db,D,E,Gb,Gb,G,G,G,D,E,F,Gb];
duration=[h,q,q,dotq,e,q,q,q,e,e,q,e,e,doth];
%A) now to play the song at normal speed
for n=1:length(notes)
time=1:delta:duration(i);
song=sin(2*pi*notes(i)*time);
sound(song, 1/delta);
end
pause(3)
%B) now to play the song at twice as fast
for n=1:length(notes)
time=1:delta:0.5*duration(i);
song=sin(2*pi*notes(i)*time);
sound(song, 1/delta);
end
pause(3)
%C) now play the song x(t) scaled to y(t) = x(2t)
for n=1:length(notes)
time=1:delta:duration(i);
song=sin(2*2*pi*notes(i)*time);
sound(song, 1/delta);
end
Comments
I don't know how to upload the sound file.
