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Noise Estimation for Speech Enhancement Using Minimum-Spectral-Average and Vowel-Presence Detection Approach

  • Ching-Ta Lu
  • Yung-Yue Chen
  • Jun-Hong Shen
  • Ling-Ling Wang
  • Chung-Lin Lei
Conference paper
Part of the Lecture Notes in Electrical Engineering book series (LNEE, volume 422)

Abstract

The accuracy of noise estimation is important for the performance of a speech enhancement system. This study proposes using variable segment length for noise tracking and variable thresholds for the determination of speech-presence probability. Initially, the fundamental frequency is estimated to determine whether a frame is a vowel. In the case of a vowel frame, the segment length increases; meanwhile the threshold for speech-presence is decreased. So the noise magnitude is adequately underestimated. The speech distortion is accordingly reduced in enhanced speech. Conversely, the segment length is rapidly decreased during noise-dominant regions. This enables the noise estimate to be updated quickly and the noise variation to be well tracked, yielding background noise being efficiently removed by the process of speech enhancement. Experimental results show that the proposed method can efficiently track the variation of background noise, enabling the performance of speech enhancement to be improved.

Keywords

Noise estimation Variable segment length Speech enhancement Harmonic adaptation Minimum-Spectral-Average 

Notes

Acknowledgements

This research was supported by the Ministry of Science and Technology, Taiwan, under contract numbers MOST 104-2221-E-468-007, and MOST 104-2628-E-006-012-MY3.

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Copyright information

© Springer Nature Singapore Pte Ltd. 2018

Authors and Affiliations

  • Ching-Ta Lu
    • 1
  • Yung-Yue Chen
    • 2
  • Jun-Hong Shen
    • 1
  • Ling-Ling Wang
    • 1
  • Chung-Lin Lei
    • 1
  1. 1.Department of Information CommunicationAsia UniversityTaichungTaiwan, ROC
  2. 2.Department of Systems and Naval Mechatronics EngineeringNational Cheng Kung UniversityTainanTaiwan, ROC

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