【作者】 崔慧娟； 计哲； 何洪华； 徐敬德； 常亮； 赵海军；

【Author】 CUI Huijuan,JI Zhe,HE Honghua,XU Jingde,CHANG Liang,ZHAO Haijun (Dept.of E.E.of Tsinghua Univ.,Beijing,100084,China,

【机构】 清华大学电子工程系；

【摘要】 本文阐述了ASELP声码器针对数字集群应用中的算法优化。由于声码器采用纯参数编码技术,与生俱来的弱点是重建语音自然度较差、算法复杂度高及鲁棒性低。针对这些弱点,我们在参数的分析、量化策略,激励信号的选择,声码器参数后处理及信源、信道编码变参数技术等方面仔细权衡,实现了基本能满足要求的2.4kb/s、1.2kb/s声码器算法。本算法已经应用于数字集群系统,得到了用户的好评。更多还原

【Abstract】 The algorithm of ASELP vocoder at 2.4kb/s,1.2kb/s for Digital Trunking System is presented in this paper. Vocoders are weak in naturalness,robustness and the high resources consumption of computing and storage resources that means high cost and power.These interferences are obstructions of its application in Digital Mobile Radio.In this ASELP vocoder,the proper excitation signal,simple quantizer and a post-processing are adopted,a trade off at the bit-rate between the vocoder and the FEC is applied.Take the advantages of these algorithms,this 2.4kb/s,1.2kb/s ASELP vocoder is perfect for a digital radio.It has been well used in Digital Trunking Systems.更多还原