| 摘要: |
| 本文提出一种新的用于LPC语音编码器的BSP激励信号，即根据语音产生的原理，以一个幅度受到二项式调制的正弦波BSP（Binomial Sine Pulse)作为LPC激励源，该二项式反映了激励信号在一个基音周期内的变化趋势。本文同时推导了BSP激励参数的求取和改进方法。实验结果表明，在此基础上构造的BSP语音编解码器具有低复杂度、低时延的优点，同时编码速率在低至2．65kb/s时，具有较高的合成语音质量。 |
| 关键词: 计算机网络 语音合成 正弦脉冲激励 语音编码 |
| DOI：10.3969/j.issn.1001-893X. |
| Revised:January 02, 2001 |
| 基金项目: |
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| A New Excitation Model for Linear Prediction- based Speech Codecs |
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| Abstract: |
| We present in this paper a new Binomial Sine Pulse (BSP) excitation signal used in linear prediction-based speech codecs. The structure of the BSP excitation signal is actually a sine wave whose amplitude is modulated by a binomial signal. The binomial signal describes the various trends of excitation signals in a pitch period, and the pulsatance of the BSP excitation signal coincides with the vibration frequency of vocal folds. In experiments, processing is going on frame by frame and the same excitation signal is placed at every pitch excitation moment in a frame. Speech codecs based on this new BSP excitation have the advantages of low complexity and low delay. Experiment results prove that such a new speech codec can provide highly intelligible synthesized speech below 3 kbps. |
| Key words: Mobile communication,Computer network,Speech synthesis,Pulse excitation |
