Audio Signal eval() Error (for Fourier Series Approximation)
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Hello everyone, I am trying to calculate the fourier series of my voice but I cannot do it. My code works for square wave, sine wave everything else but for audio file it gives error. What is my mistake and how can I converge by different methods. Thanks.
My code is:
recorder= audiorecorder(16000,8,1);
disp('please record your voice');
drawnow();
pause(1);
recordblocking(recorder, 2);
play(recorder);
data=getaudiodata(recorder);
subplot(4,1,1);
plot(data);
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
syms n aSym(n) bSym(n) x(t) t A(t)
To=2;
f=1/To;
wo=2*pi*f;
a=trapz(data);
a0= 4.08*a;
aSym(n)=simplify(int(data*cos(n.*wo.*t),t,0,To)/(To/2))
bSym(n)=simplify(int(data*sin(n.*wo.*t),t,0,To)/(To/2))
nMax = 9;
n = 1:nMax;
an = eval(aSym(n));
bn = eval(bSym(n));
converge = a0;
for m = 1:nMax
converge = converge + an(m)*cos(m*wo*t) + bn(m)*sin(m*wo*t);
end
t = 0:0.0001:2;
subplot(4,1,2);
last = eval(converge);
plot(t,last, 'linewidth', 2)
Error using eval
Argument must contain a character vector.
Error in Untitled2 (line 25)
an = eval(aSym(n));
8 个评论
Rik
2020-11-16
Audio Signal eval() Error (for Fourier Series Approximation)
Hello everyone, I am trying to calculate the fourier series of my voice but I cannot do it. My code works for square wave, sine wave everything else but for audio file it gives error. What is my mistake and how can I converge by different methods. Thanks.
My code is:
recorder= audiorecorder(16000,8,1);
disp('please record your voice');
drawnow();
pause(1);
recordblocking(recorder, 2);
play(recorder);
data=getaudiodata(recorder);
subplot(4,1,1);
plot(data);
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
syms n aSym(n) bSym(n) x(t) t A(t)
To=2;
f=1/To;
wo=2*pi*f;
a=trapz(data);
a0= 4.08*a;
aSym(n)=simplify(int(data*cos(n.*wo.*t),t,0,To)/(To/2))
bSym(n)=simplify(int(data*sin(n.*wo.*t),t,0,To)/(To/2))
nMax = 9;
n = 1:nMax;
an = eval(aSym(n));
bn = eval(bSym(n));
converge = a0;
for m = 1:nMax
converge = converge + an(m)*cos(m*wo*t) + bn(m)*sin(m*wo*t);
end
t = 0:0.0001:2;
subplot(4,1,2);
last = eval(converge);
plot(t,last, 'linewidth', 2)
Error using eval
Argument must contain a character vector.
Error in Untitled2 (line 25)
an = eval(aSym(n));
采纳的回答
Walter Roberson
2020-11-10
syms Data
assume(n, 'integer');
aSym(n) = subs( simplify(int(Data*cos(n.*wo.*t),t,0,To)/(To/2)), Data, data);
bSym(n) = subs( simplify(int(data*sin(n.*wo.*t),t,0,To)/(To/2)), Data, data);
n = 1:nMax;
an = double( aSym(n) );
bn = double( bSym(n) );
However, you will find that with that particular To that all of your a entries and all of your b entries are exactly 0.
7 个评论
Stephen23
2020-11-16
编辑:Stephen23
2020-11-16
"The code should be private"
By submitting your question on this forum you consented to the terms and conditions given here
which clearly state that you release your code under the Creative Commons Attribution Share Alike 3.0 license. So you have already given everyone on the entire planet permission to copy, distribute, and reuse your code (with appropriate attribution, of course, following the requirements of that license).
"I can not understand why u share all of my code again sir."
Because this answer does not make sense without it.
Because all of the volunteers on public internet forums volunteer their time on the understanding that their time helping one person might also be of interest and use to other people. This is the nature of such public forums.
By deleting the content of your question you treat those volunteers as your own unpaid private consultants. You unilaterally decide to reject one of the reasons for taking part in a public forum, which is that it is public.
If you want private help then you can find plenty of private consultants who will be happy to sign an NDA.
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