摘要
本文先对ITU-T G.723.1语音编解码器结构、工作方式做了简单的描述,然后对其中的基音预测模块做了算法上的具体分析,对输入、输出给该模块的参数做了明确说明,指出搜索过程是按照目标矢量(原始语音经过一系列处理后)与自适应码本贡献(用过去的激励重建语音)差值的平方最小化准则进行的。
The excitation consists of two components. The adaptive codebook contribution is taken from a segment of the past excitation. This supplies the pitch-like components by placing repetitions of past pitch pulses into the correct position in the excitation. The second excitation component is the fixed codebook contribution. The search procedure for the best excitation is done sequentially. First an adaptive codebook contribution （pitch contribution） is determined assuming the fixed codebook contribution is zero. Then, given the adaptive codebook contribution, the appropriate fixed codebook contribution is found.
出处
《无线通信技术》
2005年第3期28-30,共3页
Wireless Communication Technology
关键词
线性预测
自适应码本
基音贡献
linear prediction
adaptive codebook
pitch contribution
