Adaptive Postfiltering for Quality Enhancement of AVS-M Coded Music
An adaptive postfiltering algorithm for enhancing the quality of coded music is presented for the AVS-M decoder. The postfilter consists of a long-term postfilter in cascade with a short-term postfilter section and includes spectral tilt compensation and automatic gain control. The long-term module emphasizes periodic harmonics and attenuates the spectral valleys between periodic harmonics. We use the autocorrelations to indicate the degree of the harmonics and only when the harmonic degree beyond a given threshold the long-term module will be adopted. The short-term module, on the other hand, emphasizes music formats and attenuates the spectral valleys between formats. Unlike earlier postfilters which generally introduced a substantial amount of muffing to the output audio signal, our postfilter significantly reduces this effect by minimizing the spectral tilt in its frequency response. As a result, this postfilter achieves noticeable noise reduction while introducing only minimal distortion in the output music of AVS-M.
A VS-M postfilter short-term long-term
Kai Meng Jing Wang Zuo Wang Jingming Kuang
School of Information and Electronics Beijing Institute of Technology Beijing, China
国际会议
杭州
英文
522-525
2012-03-23（万方平台首次上网日期，不代表论文的发表时间）