DRA多声道数字音频编码算法的改进  

Improved Algorithm of DRA Multichannel Audio Coding

作　　者：许憬[1] 马文华[2] 曾庆煜[1] 马元喆[3] 

机构地区：[1]广东省广晟资产经营有限公司科技部,广东广州510600 [2]广东外语外贸大学思科信息学院计算机系,广东广州510630 [3]华南理工大学生物科学与工程学院,广东广州510006

出　　处：《电视技术》2013年第10期44-47,87,共5页Video Engineering

基　　金：广东省科技计划项目(2012B010100033)

摘　　要：采用2遍扫描和金字塔编码技术对DRA(Digital Rise Audio)多声道数字音频编码算法进行了改进,新算法会依据网络的状况自适应调整传输码率,用可变的DRA码流适应可变的网络条件。当网络条件较好时,用户可欣赏高质量DRA音乐;当网络条件变差时,传输的DRA码流减少,但用户仍可以欣赏流畅的DRA音乐。用比特流容器配置的DRA格式音乐码流在移动智能终端上的播放测试结果表明,在网络状况较差的情况下DRA格式的音乐也能流畅播放。An improved DRA coding algorithm used two-pass bit allocation module and pyramidal （multi-resolution） coding scheme is introduced. The transmission rate is changed adaptively according to the conditions of network. When the network condition is good, the whole pyramid can be delivered to the receiver, allowing a user to enjoy music with the best sound quality. When the network condition becomes poor, only lower layers of the pyramid can be delivered at significantly reduced bit rate so that the user can still enjoy DRA encoded music, although at a lower sound quality. Extensive tests using mobile terminals indicate that these two improvements enable smooth streaming of DRA music over a variety of network conditions.

关 键 词：DRA算法 数字音频编码 金字塔编码 两遍扫描 无线传输 

分 类 号：TN912.3[电子电信—通信与信息系统] TP274[电子电信—信息与通信工程]