Matlab file doesn't produce audio

Hi, I am trying to produce an audio file out of the following matlab code. When I go to play these Matlab Files Matlab just hangs and I am unable to get any output out of them. Is there a specific way that these files have to be played to get a successful output? Any help is appreciated Matlab code below

I am trying to play the bach_fugue.mat file with the 2 matlab files below.

First File

clear;
load bach_fugue.mat;
fs = 11025; % set sampling frequency
bpm = 120; % set tempo in beats per minute
bps = bpm/60; % tempo in beats per second
spb = 1/bps; % seconds per beat (inverse of bps)
spp = spb/4; % seconds per pulse
sampp = fs*spp; % samples per pulse
voices = length(theVoices);
xx = zeros(1,560000);
for i = 1:voices % for loop that runs through different voices in theVoices
notenum = length(theVoices(i).noteNumbers);
n1 = 1;
% establish value for rest
rest = key2note(0,theVoices(i).startPulses(1)*spp,i);
n2 = n1 + length(rest) - 1;
xx(n1:n2) = xx(n1:n2) + rest;
n1 = n2 + 1;
% for loop that runs through each note in current voice
for k = 1:notenum
dur = theVoices(i).durations(k)*spp;
keynum = theVoices(i).noteNumbers(k);
firstPulse = theVoices(i).startPulses(k);
tone = key2note(keynum, dur, i);
n2 = n1 + length(tone) - 1;
xx(n1:n2) = xx(n1:n2) + tone;
n1 = n2 + 1;
% conditional statement to create inter-note pauses
if k < notenum
if (theVoices(i).startPulses(k+1)-firstPulse) > dur
pause = key2note(0,theVoices(i).startPulses(k+1)-(firstPulse)*spp,i);
n2 = n1 + length(pause) - 1;
xx(n1:n2) = xx(n1:n2) + pause;
n1 = n2 + 1;
end
end
end
end

Index exceeds the number of array elements. Index must not exceed 560000.

soundsc(xx, fs);
specgram(xx,512,fs);

Second File

function xx = key2note(keynum, dur, voicenum)
fs = 11025;
tt = 0:(1/fs):dur;
if (keynum == 0)
xx = zeros(1, length(tt)); % pause if no note
else
freq = 440*2^((keynum-49)/12);
if (voicenum == 1)
f = freq*[1 2 3 4]';
A = [1 1/2 1/4 1/8];
elseif (voicenum == 2)
f = freq*[1 3 5]';
A = 0.8*[1 1/2 1/4];
elseif (voicenum == 3)
f = 1.5*freq*[1 2 3 4]';
A = [1 1/2 1/4 1/8];
end
xx = A*cos(2*pi*f*tt);
% ADSR Envelope
if( dur>0.15 )
E = interp1([0,0.05,0.1,dur-0.05,dur],[0,1,0.9,0.8,0],tt);
elseif( dur>0.10 )
E = interp1([0,0.05,dur-0.05,dur],[0,1,0.8,0],tt);
else
E = interp1([0,0.05,dur],[0,1,0],tt);
end
% multiply xx by ADSR envelope
xx = xx.*E;
end 
end

[Walter Roberson]

We need bach_fugue.mat to test with.

[Jacob]

Here you go this should be it.

[Voss]

@Jacob: I added the mat file to the question and ran the code. An error appears (see above) on this line:

xx(n1:n2) = xx(n1:n2) + pause;

due to not initializing xx with enough samples. Do you get the same error?

[Jacob]

Yes I do get the same error which is confusing I don't know why I am getting it.

[Voss]

xx = zeros(1,560000);

This makes xx length 560000. No subsequent part of the code increases the length of xx, only adds new notes onto existing consecutive elements of xx. So whatever length xx is initialized to has to be enough to store all the notes, and apparently 560000 is not enough samples to store all the notes.

[Walter Roberson]

Your song exceeds 1e8 in size.

load bach_fugue.mat;
fs = 11025; % set sampling frequency
bpm = 120; % set tempo in beats per minute
bps = bpm/60; % tempo in beats per second
spb = 1/bps; % seconds per beat (inverse of bps)
spp = spb/4; % seconds per pulse
sampp = fs*spp; % samples per pulse
voices = length(theVoices);
xx = zeros(1,1e8);
for i = 1:voices % for loop that runs through different voices in theVoices
notenum = length(theVoices(i).noteNumbers);
n1 = 1;
% establish value for rest
rest = key2note(0,theVoices(i).startPulses(1)*spp,i);
n2 = n1 + length(rest) - 1;
xx(n1:n2) = xx(n1:n2) + rest;
n1 = n2 + 1;
% for loop that runs through each note in current voice
for k = 1:notenum
dur = theVoices(i).durations(k)*spp;
keynum = theVoices(i).noteNumbers(k);
firstPulse = theVoices(i).startPulses(k);
tone = key2note(keynum, dur, i);
n2 = n1 + length(tone) - 1;
disp(-[n1, n2]), whos xx
xx(n1:n2) = xx(n1:n2) + tone;
n1 = n2 + 1;
% conditional statement to create inter-note pauses
if k < notenum
if (theVoices(i).startPulses(k+1)-firstPulse) > dur
pause = key2note(0,theVoices(i).startPulses(k+1)-(firstPulse)*spp,i);
n2 = n1 + length(pause) - 1;
disp([n1, n2]), whos xx
xx(n1:n2) = xx(n1:n2) + pause;
n1 = n2 + 1;
end
end
end
end

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Index exceeds the number of array elements. Index must not exceed 100000000.

whos xx
soundsc(xx, fs);
specgram(xx,512,fs);

function xx = key2note(keynum, dur, voicenum)
fs = 11025;
tt = 0:(1/fs):dur;
if (keynum == 0)
xx = zeros(1, length(tt)); % pause if no note
else
freq = 440*2^((keynum-49)/12);
if (voicenum == 1)
f = freq*[1 2 3 4]';
A = [1 1/2 1/4 1/8];
elseif (voicenum == 2)
f = freq*[1 3 5]';
A = 0.8*[1 1/2 1/4];
elseif (voicenum == 3)
f = 1.5*freq*[1 2 3 4]';
A = [1 1/2 1/4 1/8];
end
xx = A*cos(2*pi*f*tt);
% ADSR Envelope
if( dur>0.15 )
E = interp1([0,0.05,0.1,dur-0.05,dur],[0,1,0.9,0.8,0],tt);
elseif( dur>0.10 )
E = interp1([0,0.05,dur-0.05,dur],[0,1,0.8,0],tt);
else
E = interp1([0,0.05,dur],[0,1,0],tt);
end
% multiply xx by ADSR envelope
xx = xx.*E;
end 
end

[Jacob]

Unfortuantly the file is what I was required to use for this part. Is there anyway to still make it work? Is that why it won't play anything?

[Walter Roberson]

This is why it does not play anything: it reaches the end of array xx

[Jacob]

So is there a way to fix that or is it an error in the file thus not fixable??

[Walter Roberson]

You can set a buffer size and quit filling it when you get to the end of the buffer.

load bach_fugue.mat;
fs = 11025; % set sampling frequency
bpm = 120; % set tempo in beats per minute
bps = bpm/60; % tempo in beats per second
spb = 1/bps; % seconds per beat (inverse of bps)
spp = spb/4; % seconds per pulse
sampp = fs*spp; % samples per pulse
voices = length(theVoices);
maxXX = 560000;
xx = zeros(1,maxXX);
for i = 1:voices % for loop that runs through different voices in theVoices
    notenum = length(theVoices(i).noteNumbers);
    n1 = 1;
    % establish value for rest
    rest = key2note(0,theVoices(i).startPulses(1)*spp,i);
    n2 = n1 + length(rest) - 1;
    xx(n1:n2) = xx(n1:n2) + rest;
    n1 = n2 + 1;
    % for loop that runs through each note in current voice
    for k = 1:notenum
        dur = theVoices(i).durations(k)*spp;
        keynum = theVoices(i).noteNumbers(k);
        firstPulse = theVoices(i).startPulses(k);
        tone = key2note(keynum, dur, i);
        n2 = n1 + length(tone) - 1;
        if n2 > maxXX
            margin = maxXX - n1 + 1;
            tone = tone(1:margin);
            n2 = maxXX;
        end
        disp(-[n1, n2])
        xx(n1:n2) = xx(n1:n2) + tone;
        n1 = n2 + 1;
        if n1 > maxXX; break; end
        % conditional statement to create inter-note pauses
        if k < notenum
            if (theVoices(i).startPulses(k+1)-firstPulse) > dur
                pause = key2note(0,theVoices(i).startPulses(k+1)-(firstPulse)*spp,i);
                n2 = n1 + length(pause) - 1;
                if n2 > maxXX
                    margin = maxXX - n1 + 1;
                    pause = pause(1:margin);
                    n2 = maxXX;
                end
                disp([n1, n2])
                xx(n1:n2) = xx(n1:n2) + pause;
                n1 = n2 + 1;
                if n1 > maxXX; break; end
            end
        end
    end
end

       -4136       -5514

        5515       45480

      -45481      -46859

       46860       96472

      -96473      -98126

       98127      168411

     -168412     -170065

      170066      259644

     -259645     -261298

      261299      370170

     -370171     -371549

      371550      488690

     -488691     -490069

      490070      560000

      -48236      -49614

       49615      398280

     -398281     -399659

      399660      560000

     -136436     -137814

      137815      560000

soundsc(xx, fs);

Timeout occurred while trying to communicate to the device.

specgram(xx,512,fs);

function xx = key2note(keynum, dur, voicenum)
fs = 11025;
tt = 0:(1/fs):dur;
if (keynum == 0)
xx = zeros(1, length(tt)); % pause if no note
else
freq = 440*2^((keynum-49)/12);
if (voicenum == 1)
f = freq*[1 2 3 4]';
A = [1 1/2 1/4 1/8];
elseif (voicenum == 2)
f = freq*[1 3 5]';
A = 0.8*[1 1/2 1/4];
elseif (voicenum == 3)
f = 1.5*freq*[1 2 3 4]';
A = [1 1/2 1/4 1/8];
end
xx = A*cos(2*pi*f*tt);
% ADSR Envelope
if( dur>0.15 )
E = interp1([0,0.05,0.1,dur-0.05,dur],[0,1,0.9,0.8,0],tt);
elseif( dur>0.10 )
E = interp1([0,0.05,dur-0.05,dur],[0,1,0.8,0],tt);
else
E = interp1([0,0.05,dur],[0,1,0],tt);
end
% multiply xx by ADSR envelope
xx = xx.*E;
end 
end