MFCC into feature vector

Hello, right now im working on baby cry meaning using MFCC for feature extraction

this is my code for mfcc

[audioIn, fs] = audioread('Lelah2.wav');
coeffs = mfcc(audioIn, fs);

so the result is a matrix, not a feature vector

any suggestion to change the matrix into a feature vector ?

Answer 1

[Brian Hemmat]

The mfcc function returns mel frequnecy cepstral coefficients (MFCC) over time. That is, it separates the audio into short windows and calculates the MFCC (aka feature vectors) for each window.

For example, in this scenario:

coeffs = mfcc(audioIn,fs);
[L,M,N] = size(coeffs);

• L - Number of windows the function analyzed (aka number of feature vectors)
• M - Number of coefficients (aka number of features in each feature vector)
• N - Number of channels

Depending on your application, you may want to combine the feature vectors into a single statistical summation by averaging the coffecients, or you may want to feed each feature vector into your system separately.

For example, the following code gives the mean of the coefficients.

coeffs = mean(coeffs,1);

For more information, consult the documentation:

https://www.mathworks.com/help/audio/ref/mfcc.html#mw_7e1e2bdf-548a-45f3-a053-7627b9e8b2b9