Optimizing feature extraction for speech recognition

Chulhee Lee, Donghoon Hyun, Euisun Choi, Jinwook Go, Chungyong Lee

Research output: Contribution to journalArticle

36 Citations (Scopus)


In this paper, we propose a method to minimize the loss of information during the feature extraction stage in speech recognition by optimizing the parameters of the mel-cepstrum transformation, a transform which is widely used in speech recognition. Typically, the mel-cepstrum is obtained by critical band filters whose characteristics play an important role in converting a speech signal into a sequence of vectors. First, we analyze the performance of the mel-cepstrum by changing the parameters of the filters such as shape, center frequency, and bandwidth. Then we propose an algorithm to optimize the parameters of the filters using the simplex method. Experiments with Korean digit words show that the recognition rate improved by about 4-7%.

Original languageEnglish
Pages (from-to)80-87
Number of pages8
JournalIEEE Transactions on Speech and Audio Processing
Issue number1
Publication statusPublished - 2003 Jan

All Science Journal Classification (ASJC) codes

  • Software
  • Acoustics and Ultrasonics
  • Computer Vision and Pattern Recognition
  • Electrical and Electronic Engineering

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