多速率话音适配研究与应用  

Research and Application of Multi-rate Voice Adaption

作　　者：邵延峰[1] 康京山[1] 

机构地区：[1]中国电子科技集团公司第五十四研究所,河北石家庄050081

出　　处：《无线电通信技术》2008年第4期39-42,共4页Radio Communications Technology

摘　　要：ATM技术以定长分组进行交换和传递,是一种比较理想的承载话音业务的技术。在研究话音数据的适配方式和信元适配时延的基础上,根据AAL2适用于低速率话音和节省带宽的优点,结合工程应用和实践,选择了AAL2的话音适配方式。来自不同编解码和不同话路的话音数据经过AAL2适配,统一成以CID为标识的定长AAL2信元,在信元适配时限内填充成ATM信元,实现了多种速率编码话音包的AAL2承载和AAL2交换。ATM technology uses fixed - length cell for exchange and transmission. It is a suitable technology for voice service. In this article, AAL2 voice adaption is selected for its advantage in low rate voice and bandwidth saving based on the study of voice adapt/on and cell adaption delay and depending on engineering applications and practices. Voice data of different codecs and different channels are adapted using AAL2 to CID- identified, fixed - length AAL2 cells and are filled in ATM cells within time limit, realizing AAL2 carrying and exchange of multi - rate coded voice packet.

关 键 词：适配 AAL1 AAL2 

分 类 号：TN915.2[电子电信—通信与信息系统]