Matlab file doesn't produce audio

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Jacob
Jacob il 7 Mar 2024
Commentato: Walter Roberson il 7 Mar 2024
Ran in:
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
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Jacob
Jacob il 7 Mar 2024
So is there a way to fix that or is it an error in the file thus not fixable??
Walter Roberson
Walter Roberson il 7 Mar 2024
Ran in:
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

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