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Comparison of different implementations of MFCC

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Abstract

The performance of the Mel-Frequency Cepstrum Coefficients (MFCC) may be affected by (1) the number of filters, (2) the shape of filters, (3) the way in which filters are spaced, and (4) the way in which the power spectrum is warped. In this paper, several comparison experiments are done to find a best implementation. The traditional MFCC calculation excludes the 0th coefficient for the reason that it is regarded as somewhat unreliable. According to the analysis and experiments, the authors find that it can be regarded as the generalized frequency band energy (FBE) and is hence useful, which results in the FBE-MFCC. The authors also propose a better analysis, namely the auto-regressive analysis, on the frame energy, which outperform its 1st and/or 2nd order differential derivatives. Experiments with the “863” Speech Database show that, compared with the traditional MFCC with its corresponding auto-regressive analysis coefficients, the FBE-MFCC and the frame energy with their corresponding auto-regressive analysis coefficients form the best combination, reducing the Chinese syllable error rate (CSER) by about 10%, while the FBE-MFCC with the corresponding auto-regressive analysis coefficients reduces CSER by 2.5%. Comparison experiments are also done with a quite casual Chinese speech database, named Chinese Annotated Spontaneous Speech (CASS) corpus. The FBE-MFCC can reduce the error rate by about 2.9% on an average.

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Authors and Affiliations

  1. Center of Speech Technology, State Key Laboratory of Intelligent Technology and Systems Department of Computer Science and Technology, Tsinghua University, 100084, Beijing, P.R. China

    Zheng Fang, Zhang Guoliang & Song Zhanjiang

Authors
  1. Zheng Fang
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  2. Zhang Guoliang
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  3. Song Zhanjiang
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Correspondence to Zheng Fang.

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Zheng, F., Zhang, G. & Song, Z. Comparison of different implementations of MFCC. J. Comput. Sci. & Technol. 16, 582–589 (2001). https://doi.org/10.1007/BF02943243

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  • DOI: https://doi.org/10.1007/BF02943243

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