一种用于语声转换系统的LPC残差信号生成算法

残差信号中的基音信息对语音的说话人个性特征有着重要的影响.本文首先通过转换后的语音谱包络特征参数(LSP)来预测相应的目标基音周期,再利用预测的目标基音周期来修改源语音的残差信号,从而生成所需要的目标语音残差信号.客观评测和主观听觉测试都表明,本文的残差信号生成算法(PP DCT,Pitch Prediction Discrete Cosine Trans-form)性能要好于以往的残差预测法.

An Algorithm for Generating LPC Residual Signal Used in Voice Conversion System

Pitch information contained in residual signal of speech plays an important role in speaker identity.An algorithm (PP DCT,Pitch Prediction Discrete Cosine Transform) for generating residual signal is proposed in this paper,which firstly predicts the corresponding target pitch using the converted spectral envelop feature (LSP),and then uses DCT to modify the source residual signal according to the dynamic pitch-scale factor.Both subjective and objective evaluations are conducted.The experimental results demon- strated that the proposed algorithm can achieve better performance than the residual prediction (RP) method.