write and reading array from 2 functions files at the same time

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Hi All,

I am new with matlab, i am building a small program, where it reading an audio file and start to divide it to blocks using (For Loop), at the same time (when i create the blocks array) i want to use this blocks in another function to be in real time and not to wait till (For Loop)to finish.

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Jan 2012-2-14

You forgot to ask a question. Do you have any troubles with building this program?

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Answer 1

Honglei Chen 2012-2-14

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Looks like you want to do stream processing. I would suggest you to take a look at the example in the following page

http://www.mathworks.com/help/toolbox/dsp/ref/dsp.audioplayerclass.html

You can replace the playing part with any processing you want to do, but the example shows a framework of dividing things into small blocks and then process them in real time.

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Answer 2

adel 2012-2-15

在 MATLAB Online 中打开

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hi Jan Simon,

my question is who to read from the array at the same time when i am creating it in other function

hi Honglei Chen, thanks for the example, and u r right i am doing a stream process, but at the same time i wanna use the blocks in another process, where the size of block will change and i will re-block them again. during this process i have another process waiting for these blocks to work. u can see the code here

    function SRCFAR
global X
X=[];
% The Signal
[v, fs] = wavread('v.wav'); 
n = 1:length(v);
%resample the signal
K = 5;
fsi = fs;
fso = 8000;
blk=2048;
a=(1:blk);
Qblk=1;
Qlen=1;
% stream the audio file to be resampled by ASRC as blocks
for k=1:blk:length(n)-blk
    j=k+blk-1;
    % should be change to use SRC
    x = asrc_lagrange(xfar(k:j).', fsi/fso, 0, zeros(1, K), K);
      % recollect new size blocks 
      for i=1:length(x)
          if (Qblk>blk)
              Qblk=1;
              % put in the array
              X(Qlen,:) = a;
              a (Qblk)= x(i);
              Qlen=Qlen+1;
          else
              a (Qblk)= x(i);
              Qblk=Qblk+1;
          end;
      end;
  end;

write and reading array from 2 functions files at the same time

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