How to extract specific MFCC from .wav files?

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Ibrahim A
Ibrahim A 2019-11-7
评论： jibrahim 2020-12-17
When I use the "audioFeatureExtractor" to extract MFCC, since there are 13 MFCC features, I am not sure how to use the setExtractorParams function to pick specific MFCC features? For example, MFCC 1, 4 , 6, and 11.
aFE = audioFeatureExtractor("SampleRate",fs, ...
"mfcc",true);
idx = info(aFE) % output below.
setExtractorParams(aFE,"mfcc",) % not sure how to pick the MFCC features. I don't need all of them.
idx = struct with fields:
mfcc: [1 2 3 4 5 6 7 8 9 10 11 12 13]

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jibrahim
jibrahim 2019-11-7
Hi Ibrahim,
Here you go:
setExtractorParams(aFE,"mfcc","NumCoeffs",11)
  2 个评论
hp
hp 2020-12-17
Y NumCoeffs is 11?plz elaborate the answer
jibrahim
jibrahim 2020-12-17
Sorry, let me clarify.
You use setExtractorParams to set the number of MFCC coefficients to compute. NumCoeffs is a scalar value. This function does not enable you to "pick" specific coefficients But that is easy to do by simply indexing into the output of the audioFeatureExtractor.
[audioIn,fs] = audioread('speech_dft.wav');
aFE = audioFeatureExtractor("SampleRate",fs, ...
"mfcc",true);
% Set the max number of mfccs to compute
setExtractorParams(aFE,"mfcc","NumCoeffs",11)
features = extract(aFE,audioIn);
% Extract the coefficients you are interested in
mfccs = features(:,[1 4 6 11])

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