How to replaced extracted audio files running in a for loop?

Hello Community,

I am trying to do some features extractions in m4a, trying to extract and replace several audios which are running in a for loop with the initial 'p'.

Audio_files(p).name consist of individual .m4a files running in the for loop with the initial 'p'.

I am running into some problems with my audiowrite line. How should I rewrite the line? What am I missing here? Thank you in advance! :)

[data,samp_rate] = audioread(Audio_files(p).name);
%% equations worked on the audio file and get s, the new starting point of the audio
startSample = s;
endSample = length(data);
extractedData = data(startSample:endSample);
audiowrite(Audio_files(p).name '.m4a', extractedData,fs ); 

Answer 1

[Ameer Hamza]

audiowrite cannot save the file in .mat format. Use extension of an audio file. Also use concotenation brackets [ ]

audiowrite([Audio_files(p).name '.wav'], extractedData,fs ); 

[whalelady]

Hi Hamza, Thank you for your answer!

Would be glad if you could help with one more question regarding to this..

In my data, there are two columns. I am trying to use the second column.

If I just purely use the below code, the script will work on the first column,

how do I choose the second column, or insert data(:,end) to this code?

[data,samp_rate] = audioread(Audio_files(p).name);
%% equations worked on the audio file and get s, the new starting point of the audio
startSample = s;
endSample = length(data);
extractedData = data(startSample:endSample);
extractedData(1:2*samp_rate ) = [];
audiowrite(Audio_files(p).name '.m4a', extractedData,fs );

[Ameer Hamza]

try this

[data,samp_rate] = audioread(Audio_files(p).name);
%% equations worked on the audio file and get s, the new starting point of the audio
startSample = s;
extractedData = data(:, 2); % choose 2nd column
extractedData(1:2*samp_rate ) = []; % delete first two seconds
audiowrite([Audio_files(p).name '.m4a'], extractedData,fs );

[whalelady]

Thank you Hamza!

[Ameer Hamza]

I am glad to be of help.