一种可变速率的LD-CELP编码的研究

Research on a Variable Bit Rate for LD CELP Speech Coding

设计了一种可变速率的低时延、码激励线性预测编码（ＬＤＣＥＬＰ）的方案，它是通过修改码本来实现的。该方案工作在１１．２ｋｂｉｔ／ｓ。对其做了计算机仿真，并与１６ｋｂｉｔ／ｓ的ＬＤＣＥＬＰ算法在信噪比（ＳＮＲ）、波形等方面进行了对比，仿真结果表明效果良好。

By modifying the codebook,we can design a variable bit rate method for low delay code excited linear predictive speech coding.This design works at 11.2 kbit/s and has been simulated by computer.Comparisons with the 16 kbit/s LD CELP coder in SNR and waveform show that the VBR LD CELP can provide good speech quality.