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I saw the DCT in wiki: enter image description here

but the DCT in htk book is : enter image description here

These two formulas are not the same and I can't transform the first to the second one,anybody tell me which one is used in mfcc?

马慧超
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    There are differences in implementation caused by variety of standards. They are not significant for recognition accuracy but they lead to different values. See also https://stackoverflow.com/questions/52112204/why-do-mfcc-extraction-libs-return-different-values – Nikolay Shmyrev Oct 22 '18 at 22:20

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