一种特征波提取速率自适应的波形内插语音编码方案
doi: 10.3724/SP.J.1146.2005.01325
A Characteristic Waveform Extraction Rate Adaptive WI Speech Coding Scheme
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摘要: 该文提出了一种特征波形提取速率自适应于输入语音帧特性的波形内插编码方案。基于双加权长时预测增益最大原则并利用前向基音判决实现了较为可靠的基音周期估计算法，用基音周期、浊音度和波表面平坦度决定波形提取速率以及SEW(Slowly Evolving Waveform)和REW(Rapidly Evolving Waveform)的更新速率。实验证明，该文提出的波形内插(WI)编码算法相比固定波形提取速率的WI算法在平均码率和计算复杂度上均有一定程度的降低，且合成语音质量明显优于4.8kbps的CELP语音编码算法。Abstract: This paper presents a Waveform Interpolation (WI) speech coder, which characteristic waveform extraction rate is adaptive to the feature of the input frame. Efficient pitch estimation algorithm is based on the principle of maximizing double weighted Long Time Prediction(LTP) gain and uses the forward pitch detection. The waveform extraction rate and the update rate of SEW(Sulocoly Evoloiuy Waveform) and REW(Rapidly Evolving Waveform) are based on the three features: pitch cycle, voicing degree and stationary degree of waveform surface. Tests indicate that the proposed WI coding algorithm has lower average bit rate and computing complexity compared to the fixed-extraction-rate WI coder and obviously deliver better quality than FS1016 CELP at 4.8kbps.
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