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中文摘要：
为了提高自适应后向码本的精度,提出了一种码本更新的新算法.该算法设置了一个线谱频率系数自适应后向码本,通过对该码本中最新一个码矢量与当前帧线谱频率系数内插来提高线性预测系数自适应后向码本的精度,从而提高了后向量化的使用率,降低了平均编码速率.主客观测试表明,改进算法的合成语音质量好于自适应前后向量化IMBE算法,且合成语音质量与2.4 kb/s IMBE算法相当.
英文摘要：
A new method for updating the codebook is proposed to improve the accuracy of the adaptive backward codebook. This new algorithm sets up a line spectrum frequency coefficient＇s adaptive backward codebook, which implements the interpolation between the line spectrum frequency coefficients to improve the precision of the linear prediction coefficient＇s adaptive backward codebook. As a result, it increases the use frequency of the backward quantization and reduces the average coding rate. Objective and subjective tests show that the quality of speech synthesized by the improved method is superior to the one synthesized by the IMBE algorithm with adaptive forward-backward quantization, and as good as the one synthesized by the 2.4 kbps IMBE algorithm.
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