Arrays have incompatible sizes for this operation.

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i have the following code which mixes two audios as the user enters the number he wants to mix
freq = str2double(get(handles.edit3,'string'));
scnd = str2double (get(handles.edit10,'string'));
[y,Fs] = audioread("Sound and "+freq+" hz.wav");
[x,Fs] = audioread(scnd+".wav");
mix = y+x;
soundsc(mix,sample);
Nsamps = length(mix);
t = (1/Fs)*(1:Nsamps);
y_fft = abs(fft(mix));
y_fft = y_fft(1:Nsamps/2);
f = Fs*(0:Nsamps/2-1)/Nsamps;
axes(handles.axes3);
plot(f, y_fft)
xlim([0 5000])
ylim([0 5000])
end
some values seem to work while others dont and i get Arrays have incompatible sizes for this operation.
  3 Comments

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Accepted Answer

Mathieu NOE
Mathieu NOE on 29 Aug 2022
hello
in case the two files have different number of samples, either you truncate the longest one or you padd the shortest one (with zeros);
I opted for the second solution :
freq = str2double(get(handles.edit3,'string'));
scnd = str2double (get(handles.edit10,'string'));
[y,Fs] = audioread("Sound and "+freq+" hz.wav");
[x,Fs] = audioread(scnd+".wav");
%%
x = x(:); % make x col vector
y = y(:); % make y col vector
lx = numel(x);
ly = numel(y);
if ly>lx
x = [x; zeros(ly-lx,1)];
elseif ly<lx
y = [y; zeros(lx-ly,1)];
end
%%
mix = y+x;
% soundsc(mix,sample); % ?? 2nd argument should be Fs ?
soundsc(mix,Fs); % please double check 2nd argument
Nsamps = length(mix);
t = (1/Fs)*(1:Nsamps);
y_fft = abs(fft(mix));
y_fft = y_fft(1:Nsamps/2);
f = Fs*(0:Nsamps/2-1)/Nsamps;
axes(handles.axes3);
plot(f, y_fft)
xlim([0 5000])
ylim([0 5000])
  2 Comments
Mathieu NOE
Mathieu NOE on 2 Sep 2022
hmm
I wonder if your files have one or more channels , so what are dimensions of x and y just after your read them
[y,Fs] = audioread("Sound and "+freq+" hz.wav");
[x,Fs] = audioread(scnd+".wav");
maybe your "echoes" are related to these lines I introduced , have to change that for multi channel audio (if that is the case) :
x = x(:); % make x col vector
y = y(:); % make y col vector

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