【摘要】 通过研究语音残差信号的合成方法,给出了一种改进的波形内插(Waveform Interpolation,WI)编码器语音重建方案,去除了解码器中特征波形(Characteristic waveform,CW)的对齐运算。在该方案中,当帧间的基音周期连续变化时,语音残差信号由幅度谱和相位轨迹直接合成,而当基音周期发生跳变时,则利用相位过渡过程合成语音残差信号。该方法大大降低了WI解码器的复杂度,同时保证了合成语音质量没有变化。更多还原

【Abstract】 An improved speech reconstruction scheme of waveform interpolation(WI) coder is presented by studying a speech signal synthesis method without characteristic waveform(CW) alignment.In this scheme,the speech residual signal is directly synthesized using the magnitude spectrum and the phase track.There are continuous changes for pitch between frames,while the speech residual signal is synthesized by using phase intergradations with a burst of the pitch.The computing complexity of WI decoder is reduced by the method,meanwhile the reconstructed speech quality keeps invariable.更多还原