Denoising on adapted wavelet packets domain for robust speech recognition
- Title
- Denoising on adapted wavelet packets domain for robust speech recognition
- Author
- 양성일
- Issue Date
- 2001-06
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Citation
- ISIE 2001. 2001 IEEE International Symposium on Industrial Electronics Proceedings (Cat. No.01TH8570), v. 1, page. 495-500
- Abstract
- In a real environment, additive noise will corrupt input speech for speech recognition. In this paper, the authors propose a noise suppression method on the wavelet packet domain as a front-end pre-processor for robust speech recognition. They focus on the enhancement of the formant characteristic to input speech. Suppose, one has observations y/sub i/=f(t/sub i/)+ /spl sigma//spl middot/z/sub i/, i=0, 1, ..., n-1, where f(t/sub i/) is the speech signal and z/sub i/ is i.i.d. white Gaussian noise (AWGN). And assume that one has an available library L of orthogonal bases, such as wavelet packet bases. Using these assumptions, the authors enhance the formant characteristic as well as SNR by adjusting each node variance from adapted wavelet packet transform (AWPT) tree. Experimental result shows an enhancement of SNR from 3.58 dB to 8.66 dB. Also, phoneme recognition performance is improved more than 6%. It confirms the robustness of proposed noise suppression method against additive white Gaussian noise.
- URI
- https://ieeexplore.ieee.org/document/931841?arnumber=931841&SID=EBSCO:edseeehttps://repository.hanyang.ac.kr/handle/20.500.11754/158326
- ISBN
- 0-7803-7090-2; 978-0-7803-7090-6
- DOI
- 10.1109/ISIE.2001.931841
- Appears in Collections:
- COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > ELECTRICAL ENGINEERING(전자공학부) > Articles
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