Journal of South China University of Technology (Natural Science Edition) ›› 2011, Vol. 39 ›› Issue (2): 26-31.doi: 10.3969/j.issn.1000-565X.2011.02.005

• Electronics, Communication & Automation Technology • Previous Articles     Next Articles

 Mel-Warping-Based TELPC Algorithm for Estimating Spectral Envelope

Li Ye Yang Jia-wei Liang Yan-xia   

  1. Xian university of electronic science and technology YeWuWang theory and key technology comprehensive national key laboratory, xian in shaanxi 710071
  • Received:2010-04-14 Revised:2010-08-16 Online:2011-02-25 Published:2011-01-02
  • Contact: 李烨(1982-)，男，博士生，主要从事语音编码、语音信号处理研究 E-mail:yli@pcn.xidian.edu.cn
  • About author:李烨(1982-)，男，博士生，主要从事语音编码、语音信号处理研究
  • Supported by:

    国家杰出青年科学基金资助项目(60725105)；国家自然科学基金资助项目(61072068)

PDF

1017

Abstract:

In order to perceptually enhance the spectral envelope extracted via TELPC algorithm,a new estimation algorithm of spectral envelope is proposed using the property of auditory perception.In this algorithm,the spectral envelope is extracted using a real-time true envelope（TE） estimator and is perceptually enhanced via the Mel-warping.Then,a linear predictive analysis is performed for the warped envelope.Moreover,the warped envelope is compressed to further improve the performance of linear prediction coding（LPC）.The Mel-warping is implemented in two ways： one is by the Fourier transform pair and the other is by the linear interpolation of spectral envelope.Test results indicate that,as compared with the existing TELPC algorithm,the proposed algorithm is more effective because it results in smaller log-spectral distortion and spectral flatness in the low-frequency band,as well as higher performance due to the envelope compression.

Key words: speech analysis, envelope detectors, cepstral analysis, linear predictive coding, Mel-warping