Why do I recieve an error "Index in position 1 exceeds array bounds" ?

I have a dataset with 5132 audio samples. The samples have different time duration. Samples ranging from 1 to 10 seconds.

For Eg: Audiofile1 has duration 1 secs, Audiofile 2 has duration of 6 seconds, Audiofile 3 has duration of 10 seconds..................etc.

I had to remove the silent parts from each sample. Then I have to trim this modified sample to just 1 second (First 1 Second). Once the program is run. A few samples work through but some gave me an error ( I had to manually change 'y' with various 'i' values inorder to check which sample gave me the error)

clear;

close all;

NewTrimmed = 'C:\Users\joena\Desktop\backup_cough_from_main_folder\TrimmedSamples\'; %Creation of a new folder for Trimmed samples

s = 'C:\Users\joena\Desktop\backup_cough_from_main_folder\coughswav\';

Coughdirectory = dir(['C:\Users\joena\Desktop\backup_cough_from_main_folder\coughswav','/*.wav']);

Totalfiles =size(Coughdirectory,1); %Counting the number of samples

Name_of_file = cell(1,Totalfiles); % Pre-Allocation using Cell array

Name_of_file{1,Totalfiles} =[];

%k = 'C:\Users\joena\Desktop\backup_cough_from_main_folder\coughswav\006f340f-7067-4a95-ae52-97bf9ba31558.wav';

%Ignore the above commented line

for i = 1:Totalfiles %Loop to go through all the dataset, Remove silence parts and then crop it to 1 sec clips

Name_of_file = strcat(s,Coughdirectory(i).name);

[y,Fs] = audioread(Name_of_file);

envelope = imdilate(abs(y), true(1501, 1)); % To remove the quiet parts in the audio

quietParts = envelope < 0.04; % Or whatever value you want

% Cut out quiet parts and plot.

yEdited = y; % Initialize

yEdited(quietParts) = [];

desiredlength = 1; % Cut the yEdited audio file to 1 second (First One Second)

L = Fs * desiredlength; % ################ IS THERE AN ALTERNATIVE CODE FOR CROPPING AUDIO TO 1 SECOND

trimmedAudioMatrix =yEdited(1:L,:);

plot(trimmedAudioMatrix);

Newfilesaved = strcat(NewTrimmed,Coughdirectory(i).name); % saving the modified audio with the name of the original

audiowrite(Newfilesaved,trimmedAudioMatrix,Fs); % Saved to a new folder 'Newfilesaved'

end

The error ( This error occurs with only some files)

Index in position 1 C

Error in march_11 (line 37)
    trimmedAudioMatrix =yEdited(1:L,:);

Answer 1

[Star Strider]

Try this —

    desiredlength = 1;            % Cut the yEdited audio file to 1 second (First One Second)
    L = Fs * desiredlength;       % ################ IS THERE AN ALTERNATIVE CODE FOR CROPPING AUDIO TO 1 SECOND
    trimmedAudioMatrix = yEdited;
    if size(yEdited,1) > L
        trimmedAudioMatrix = yEdited(1:L,:);
    end

The problem is apparently that not all the ‘y’ arrays are longer than 1 second.

.

[Joenam Coutinho]

Thank you so much. That worked just fine :)

[Star Strider]

As always, my pleasure!