MATLAB: How to concatenate two audio files of different matrix dimensions

audiodspmatrixvertcat

Hi all,

this is my code-

[y1,Fs] = audioread('M:\audio files\british.wav');
len= length(y1);
[y2,Fs] = audioread('M:\audio files\door1.wav');
q=44100; %sampling rate of y1
% Extract first 10second samples from y1,
% Then attach y2,
% Then extract the remaining samples
% and stick them on the end.
y3 = [y1(1:q*10,:); y2; y1(q*10+1:end)];
audiowrite('M:\audio files\british.wav', y3,Fs);

the error message which i get is-

Error using vertcat
Dimensions of matrices being concatenated are not consistent.
Error in Untitled2 (line 13)
y3 = [y1(1:q*10,:); y2; y1(q*10+1:end)];

can anyone please help me with this problem?

Best Answer

You're missing the column indexing in your y1(q*10+1:end), therefore it's converted into a row vector, which will have a different number of columns than y2 and y1(1:q*10,:). The correct code:

y3 = [y1(1:q*10,:); y2; y1(q*10+1:end, :)]; %that last colon is critical

Of course, y2 must have the same numbers of channels as y1 for the above to work.

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MATLAB: Concatenate two audio files

If your intentions are to subsample every 8000 values in y1 and then concatenate y2 to the end,

y3 = [y1(1:y1_sample_rate:numel(y1)); y2]; 
%                         |________|    ^ no need for semicolon

MATLAB: How to properly sum 3D matrixes

Use this function:

function M=sumnd(M,dim)
s=size(M);
M=permute(M,[setdiff(1:ndims(M),dim),dim]);
M=reshape(M,[],s(dim));
M=sum(M,2);
s(dim)=1;
M=reshape(M,s);
end

Code:

A=sumnd(M,3) ;
A = simplify(A) ;

Result:

[ x1*y1*(z1 + z2 + z3), x1*y2*(z1 + z2 + z3), x1*y3*(z1 + z2 + z3)]
[ x2*y1*(z1 + z2 + z3), x2*y2*(z1 + z2 + z3), x2*y3*(z1 + z2 + z3)]
[ x3*y1*(z1 + z2 + z3), x3*y2*(z1 + z2 + z3), x3*y3*(z1 + z2 + z3)]

Best Answer

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