processing wav data to extract

hello

am not an expert in matlab and using this code to load multiple wav sound in matlab now how I can process data so I can run the extract features like find peaks,...… and other feature ( I got the feature codes but I to process these first ).

 numfiles = 2;
mydata = cell(1, numfiles);
for k = 1:numfiles 
myfilenames = sprintf('a%d.wav', k);
mydata{k} = importdata(myfilenames);
   end

[sam aldoss]

my question was how to process the wav files after loading in matlab

Answer 1

[Walter Roberson]

for k = 1 : numfiles
  thisdata = mydata{k};
  [peaks{k}, peaklocs{k}] = findpeaks(thisdata);
end

[sam aldoss]

this was wrong I have try this one but it says Expected Y to be one of these types:

double, single

[Walter Roberson]

numfiles = 2;
mydata = cell(1, numfiles);
for k = 1:numfiles 
  myfilenames = sprintf('a%d.wav', k);
  [mydata{k}, myfs{k}] = audioreader(myfilenames);
 end

for k = 1 : numfiles
  thisdata = mydata{k};
  thisfs = myfs{k};
  thistime = (1:size(thisdata,1)) ./ thisfs;
  for chan = 1 : size(thisdata, 2)
    [peaks{k, chan}, peaklocs{k, chan}] = findpeaks(thistime, thisdata(:,chan));
end

This would need a slight adjustment if you want the first sample to be considered to be at time 0 instead of time 1/fs.

The code isolates peaks independently for any channels. If there is a mix of number of channels in the files, then some of the peaks{k,channel} and corresponding peaklocs{K,channel} entries might be []

[sam aldoss]

Undefined function or variable 'audioreader'.

[sam aldoss]

my question was how to process the wav files after loading in matlab

[Walter Roberson]

audioread() instead of audioreader()

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The Cheshire Cat: That depends a good deal on where you want to get to.

Alice: I don't much care where.

The Cheshire Cat: Then it doesn't much matter which way you go.

Alice: ...So long as I get somewhere.

The Cheshire Cat: Oh, you're sure to do that, if only you walk long enough.”

[sam aldoss]

thanks