SOUNDS FILES
Tune played at normal speed/pitch
MATLAB CODE
clc
clear
%The frequencies (Hz) shown below were found on the NYU CS website:
%http://www.cs.nyu.edu/courses/fall03/V22.0201-003/notes.htm
C = 262; CSharp = 227; D = 294; DSharp = 311; E = 330;
F = 349; FSharp = 370; G = 392; GSharp = 415; A = 440;
ASharp = 466; B = 494;
%Note Lengths defined below:
QTR = 0.25; HLF = 0.50; ETH = 0.125;
%This is the array that makes up the notes played in the song:
noteOrder = [DSharp, F, G, GSharp, ASharp, C, C,
CSharp, CSharp, CSharp, GSharp, ASharp,
ASharp, C, C, C, ASharp, GSharp, ASharp,
C, C, ASharp, F, G, GSharp, G, F ,ASharp, ASharp];
noteLength = [HLF, QTR, QTR, QTR, ETH, QTR, QTR, QTR,
ETH, ETH, QTR, ETH, ETH, HLF, QTR, HLF,
QTR, QTR, ETH, QTR, QTR, QTR, ETH, ETH,
QTR, ETH, ETH, HLF, QTR];
numNotes = 29; %Number of notes to be played
delta = 0.00005; %Sampling Rate
x = 1; %Counter Value
count1 = 1; %Used as counter for while loop.
%PART A
while x<= numNotes;
t1 = 0:delta:noteLength(x); %Helps scale the length of notes
p1 = sin(2*pi*noteOrder(x)*t1); %Sound function
count2 = 1; %While loop counter
while count2<length(p1); %Builds the array.
writeArray1(count1) = p1(count2);
count1 = count1 + 1;
count2 = count2 + 1;
end
x = x + 1; %Increments the loop counter
end
sound(writeArray1, 1/delta); %Plays sound file
x = 1; %Counter Value
count1 = 1; %Reinitializes the counter
%PART B
while x<= numNotes;
t2 = 0:delta:0.5*noteLength(x); %Helps scale the length of notes
p2 = sin(2*pi*noteOrder(x)*t2); %Sound function
count2 = 1;
while count2<length(p2); %Builds the array
writeArray2(count1) = p2(count2);
count1 = count1 + 1;
count2 = count2 + 1;
end
x = x + 1; %Increments the loop counter
end
sound(writeArray2, 1/delta); %Plays the sound file
x = 1; %Counter Value
count1 = 1; %Reinitializes the counter
%PART C
while x<= numNotes;
t3 = 0:delta:noteLength(x); %Helps scale the length of notes
p3 = sin(2*pi*noteOrder(x)*2*t3); %Sound Function
count2 = 1;
while count2<length(p3); %Builds the array
writeArray3(count1) = p3(count2);
count1 = count1 + 1;
count2 = count2 + 1;
end
x = x + 1; %Increments the loop counter
end
sound(writeArray3, 1/delta); %Plays the sounds file
%Below are the matlab commands used to write the sound files to 3 separate
%files. The files will be written to the same director as this ".m" file.
wavwrite(writeArray1,'fightSong_PartA.wav');
wavwrite(writeArray2,'fightSong_PartB.wav');
wavwrite(writeArray3,'fightSong_PartC.wav');
Results
This part of the HW was a lot of fun. I had no idea that Matlab could generate sound files. The project wasn't too hard, but it seemed to take a long time. It was a great "hands on" application of the material we've been learning in class.
