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I have recently started to use MFCC as a feature for a project. However, I am unable to understand why MFCC have varying 2nd dimension size even when I chose the number of coefficients to be 40.

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  • $\begingroup$ It is a little bit difficult to answer this question without knowing a little bit more about the problem or how you are going about solving it (?). Which one is this varying 2nd dimension? The number of coefficients or the time dimension? $\endgroup$ – A_A Jun 18 '18 at 9:31
  • $\begingroup$ Are you simply talking about having 40 MFCC's per frame, where number of frames is dependent on the signal length? $\endgroup$ – jojek Jun 19 '18 at 8:08
  • $\begingroup$ @jojek yes, can I fix the number of frames ? $\endgroup$ – user5722540 Jun 20 '18 at 12:01
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    $\begingroup$ You can’t unless you trim files to the same length. Anyway if you are asking about keeping the same dimension in time then for 99% you are doing something wrong. Also have a look here. $\endgroup$ – jojek Jun 21 '18 at 15:16

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