CELP

The Study of Algorithm of Short-Delay Predictor in CELP

CELP短时预测器算法的研究

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CELP coders, due to its high quality of reconstructed speech and robustness against channel noise, have many applications in mobile communication, encrypted telephone and voice relay service etc.

CELP以其高质量的合成语音及优良的抗噪声和多次转接性能，在移动通信，保密电话和语音中继等中低速率上获得了广泛应用。

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On the other side, the character of CELP algorithm is that it does not distinguish voiced or unvoiced speech, and it uniformly uses time domain waveform matching method based on AbS principle to produce LP excitation, which is represented by vector codes.

CELP算法的主要特点是不区分语音信号的清浊音类型，而是统一使用基于AbS原理的时域波形匹配方法来产生线性预测激励，且该激励信号通过矢量码本来表示。

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CELP is a low bit rate speech compression algorithm that applies the ABS ( analysis-by-synthesis ) method.

码簿激发线性预测)是一种利用ABS ( 合成分析法 ) 而可将语音压缩到低位元率的演算法.

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A speech recorder and player system based on 4kb/ s dispersed-pulse CELP ( DP-CELP) speech coding algorithm is being developed by Telecommunication and Signal Processing Lab in BJUT.

北京工业大学通信与信号处理研究室也正在开发一种基于4kb／s散布脉冲CELP（DP-CELP）语音编解码算法的DSP实时语音记录和回放系统。

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This annex includes electronic material containing low bit rate LD _ CELP implementation test vectors.

本附件包括含有低比特率LD-CELP实现测试矢量的电子资料.

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Research on a Variable Bit Rate for LD CELP Speech Coding

一种可变速率的LD-CELP编码的研究

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A study on 6.3 kbit/ s CELP Speech Coder

6.3kbit/s CELP语音编码的研究

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CELP based speech coding/ decoding system and its DSP realization

基于CELP的语音编解码系统及其DSP实现

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The computational cost of CELP coding can be reduced more than an order of magnitude by using the populating code book.

通过用繁殖码本，使CELP编码的计算量减少近一个数量级。

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Based on the CELP algorithm model, many speech standards are made.

很多语音标准都是基于CELP算法模型之上而制定的，但它们都采用了AR模型。

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The CELP Coder usually uses a long-term predictor that the delay is the integer multiples of sampling interval to exploit the quasi-periodic structure of speech.

在CELP编码器中，通常用延迟为抽样间隔整数倍的长项预测器表征浊音语音的准周期性。

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Simulation results shows that, the time waveform of the synthetic speech of ARMA-CELP is much closer to the input speech, and the speech quality is better.

仿真表明，ARMA-CELP的合成语音的时间波形更接近原始语音，且音质较好。

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