상세정보
학술대회
MDCT Domain Postfiltering for Speech Quality Enhancement
- 발행일
- 201410
- 출처
- International Conference on Information and Communication Technology Convergence (ICTC) 2014, pp.892-894
- 협약과제
- 14MS1500, 모바일 플랫폼 기반 대화모델 적용 자연어 음성인터페이스 기술 개발, 이윤근
- 초록
- 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 제안 키워드
- Local minima, Peaks and valleys, Quality enhancement, Spectral peaks, linear interpolation, piecewise linear, short-term, speech quality