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create a piece of music using matlab??

Asked by Passband Modulation on 21 Sep 2012
Latest activity Commented on by Franklin on 10 Oct 2014

given a note file named “toneA.m"

------ note A-----

 clear all
 Fs=8000;
 Ts=1/Fs;
 t=[0:Ts:1];
 F_A=440; %Frequency of note A is 440 Hz
 A=sin(2*pi*F_A*t);
 sound(A,Fs);

The frequencies of notes B, C#, D, E and F# are 493.88 Hz, 554.37 Hz, 587.33 Hz, 659.26 Hz and 739.99 Hz, respectively.

how to write a MATLAB file to produce a piece of music with notes in the following order : A, A, E, E, F#, F#, E, E, D, D, C#, C#, B, B, A, A. Assign the duration of each note as 0.3s.

2 Comments

Passband Modulation on 21 Sep 2012

my question is how do make a series of notes in just a note file, so that they sound like a piece of music?

Sean de Wolski on 21 Sep 2012

In grad school I figured out how to play every Linkin Park song:

sound(rand(100000,1),20000)
Passband  Modulation

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3 Answers

Answer by Star Strider on 21 Sep 2012

I suggest:

notecreate = @(frq,dur) sin(2*pi* [1:dur]/8192 * (440*2.^((frq-1)/12)));
notename = {'A' 'A#' 'B' 'C' 'C#' 'D' 'D#' 'E' 'F' 'F#' 'G' 'G#'};
song = {'A' 'A' 'E' 'E' 'F#' 'F#' 'E' 'E' 'D' 'D' 'C#' 'C#' 'B' 'B' 'A' 'A'};
for k1 = 1:length(song)
    idx = strcmp(song(k1), notename);
    songidx(k1) = find(idx);
end    
dur = 0.3*8192;
songnote = [];
for k1 = 1:length(songidx)
    songnote = [songnote; [notecreate(songidx(k1),dur)  zeros(1,75)]'];
end
soundsc(songnote, 8192)

0 Comments

Star Strider
Answer by Wayne King on 21 Sep 2012
Edited by Wayne King on 21 Sep 2012

Simple sine waves are not going to sound like music even if you string them together. I'm not a music expert by any stretch of the imagination, but an A played on a piano vs. guitar sounds different (and much richer) because of the harmonic structure.

I have not done the notes in the order you give, but you can easily modify:

 Fs=8000;
 Ts=1/Fs;
 t=[0:Ts:0.3];
 F_A = 440; %Frequency of note A is 440 Hz
 F_B = 493.88;
 F_Csharp = 554.37; 
 F_D = 587.33;
 F_E = 659.26;
 F_Fsharp = 739.9;
 notes = [F_A ; F_B; F_Csharp; F_D; F_E; F_Fsharp];
 x = cos(2*pi*notes*t); 
 sig = reshape(x',6*length(t),1);
 soundsc(sig,1/Ts)

1 Comment

Franklin on 10 Oct 2014

I'm able to replicate your example.

But, what if instead of x being cos (2*pi*note*t), x is defined as: 0.25* (2*pi*F_A*t) + 0.5* (2*pi*F_B*t) + 0.75* (2*pi*F_C*t)?

I'm not sure how to setup the constants outside of the cosine functions.

Wayne King
Answer by Daniel on 21 Sep 2012

There are a number of things on the FEX. For example FEX:Matlab Piano.

0 Comments

Daniel

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