| 8Kb／sLD－CELP编码器的研究 |
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| 引用本文： | 陈健,曹建杰.8Kb／sLD－CELP编码器的研究[J].上海交通大学学报,1996(11). |
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| 作者姓名： | 陈健 曹建杰 |
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| 摘 要： | 描述了一种８Ｋｂ／ｓ的低延迟ＣＥＬＰ编码器．这种编码器采用后向自适应技术，所使用的激励矢量长度很短，使得单向编译码延迟小于５ｍｓ，计算复杂度也由于使用了“形状－增益”码本而得到降低．这种编码算法包括：（１）用于ＬＰＣ分析的汉明窗（Ｈａｍｍｉｎｇｗｉｎｄｏｗｓ）；（２）三抽头基音预测器和１０阶ＬＰＣ预测器的级联；（３）对数增益预测器；（４）闭环搜索．
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| 关 键 词： | 语音编码 线性预测编码 码激励线性预测 |
Study on LD-CELP Coder at the Bit Rate of 8 Kb/s |
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| Chen Jian, Cao Jianjie.Study on LD-CELP Coder at the Bit Rate of 8 Kb/s[J].Journal of Shanghai Jiaotong University,1996(11). |
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| Authors: | Chen Jian Cao Jianjie |
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| Institution: | Department of Electronic Engineering |
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| Abstract: | The paper presents an 8 Kb/s low delay CELP coder. With backward adaptation the coder uses small excitation vectors and then makes one way CODEC delay smaller than 5ms,and the computational complexity is reduced by a"gain-shape"codebook. The algorithm includes: (1 )a Hamming window for LPC analyses; (2) tandom of a three-tap pitch predictor and a 10-order LPC predictor; (3) a log-gain predictor; (4)closed-loop search. |
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| Keywords: | speech coding linear prediction coding code-excited linear prediction |
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