extract audio features from music

My code below is failing to extract the audio features specified on the code and I can't solve the problem. Anyone can help please? Thanks very much

Matlab presents the following errors:

'Unrecognized function or variable 'spectralCentroid'.

Error in AudioFeaturesExtractAudioToolbox_01>extractAudioFeatures (line 49)

spectralCentroid = spectralCentroid(audio,sampleRate);

Error in AudioFeaturesExtractAudioToolbox_01 (line 20)

features = extractAudioFeatures(audio,sampleRate,chosenFeatures);'

%This code extracts audio features from all audio files within a folder and saves the extracted features in separate '.mat' files

% select the folder path where audio files are located
folderPath = 'C:\Users\xxxxx\Documents\MATLAB\Experiment3';

%get a list of all audio files in the folder
fileList = dir(fullfile(folderPath,'*.wav')); 

%Specify the chosen audio features
chosenFeatures = {'mfcc','spectralCentroid','spectralRolloff'};

% Loop through each audio file
for i = 1:length(fileList)

    % Read the audio file
    filePath = fullfile(folderPath,fileList(i).name);
    [audio,sampleRate] = audioread(filePath);

    % Extract chosen audio features 
    features = extractAudioFeatures(audio,sampleRate,chosenFeatures);

    % Do something with extracted features (e.g. save to a file)
    saveFilePath = fullfile(folderPath,[fileList(i).name '_features.mat']);
    save(saveFilePath,'features');
end
%% 

% Function to extract the chosen audio features
function features = extractAudioFeatures(audio,sampleRate,chosenFeatures)

% Convert audio to mono if it is stereo

if size(audio,2) > 1
    audio = mean(audio,2);
end

% Normalize the audio signal
audio = audio / max(abs(audio));

% Extract the chosen audio features

features = struct();
if ismember('mfcc', chosenFeatures)
    mfccCoeffs = mfcc(audio,sampleRate);
    features.mfcc = mean(mfccCoeffs,2); % Take the mean across time
end

if ismember('spectralCentroid',chosenFeatures)
    spectralCentroid = spectralCentroid(audio,sampleRate);
    features.spectralCentroid = mean(spectralCentroid); %single value
end

if ismember('spectralRolloff = mean(spectralRolloff', chosenFeatures)
    spectralRolloff = spectralRolloffPoint(audio, sampleRate);
    features.spectralRolloff = mean(spectralRolloff); %single value
end

% Add more feature extractions as needed later

end

Answer 1

[Star Strider]

The spectralCentroid function was introduced in R2019a. You need to have that or a later release to be able to use it.

[Rita Campos]

Thanks very much for your help! Sorry for the delay of my reply.

I am using R2023 so it should work, correct? But it does not, unfortunately.

Thanks

[Star Strider]

I assume that you have the Audio Toolbox licensed and installed.

If you do, and you are still having the same problem, run these from a script or your Command Window:

restoredefaultpath

rehash toolboxcache

If that fails to solve the problem, Contact Support.

.

[Rita Campos]

Yes, it is licensed and installed.

MATLAB Version 9.14 (R2023a)

Audio Toolbox Version 3.4 (R2023a)

I'll contact support. Thanks!

[Star Strider]

My pleasure!

[Rita Campos]

Still in regard to the above code, could you please teach me how to implement BPM tracking in that code. What I need to do is be able to get the BPM for each song that is part of the above folder/fileList.Basically just like I extract other features, I also need to extract BPM.

I have found information regarding audiotoolbox on how to do it, but can't figure out how to make it work as part of my code above.

Any chance you could please help?

Thanks in advance.

[Star Strider]

I do not have any experience with the Audio Toolbox, or its functions.