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discard the 1st DCT coefficient in mfcc #7
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The first DCT coefficient is affected by the sampling precision of the audio.
That is, for 2 audios with the same content but stored in different formats, like 32-bit floating-point and 32-bit PCM, the first coefficients of each frame are different while others are the same.
Therefore the first DCT coefficient should not be considered valid.
It's also instructed in this tutorial to "Keep DCT coefficients 2-13, discard the rest".