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Conference Paper
MDCT Domain Postfiltering for Speech Quality Enhancement
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- Authors
- Hyun Woo Kim, Jeon Gyu Park
- Issue Date
- 2014-10
- Citation
- International Conference on Information and Communication Technology Convergence (ICTC) 2014, pp.892-894
- Publisher
- IEEE
- Language
- English
- Type
- Conference Paper
- Abstract
- In this paper, we propose a MDCT domain postfilter to suppress the noise in speech spectral valleys and allow more noise in speech spectral peaks. Since peaks and valleys of MDCT coefficients don't correspond to those of speech spectrum, we construct both the short-term and long-term postfilter using MDCT pseudo spectrum. The short-term postfilter is induced by smoothing the envelope that is obtained by a piece-wise linear interpolation between consecutive local minima of the MDCT pseudo spectrum. And the long-term postfilter is generated by smoothing the residual spectrum that is a difference between the MDCT pseudo spectrum and envelope. Experiments show that the proposed method outperforms the G.729.1 postfilter.
- KSP Keywords
- Linear interpolation, Local minima, Peaks and valleys, Spectral peaks, piecewise linear, quality enhancement, short-term, speech quality