关键词: 语音分析, 包络检测器, 倒谱分析, 线性预测编码, 美尔卷曲

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