| 一种多媒体会议系统的实时同步混音转发算法 |
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| 引用本文： | 李宇,郭雷勇,陈建铭,谭洪舟.一种多媒体会议系统的实时同步混音转发算法[J].中山大学学报(自然科学版),2010,49(2). |
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| 作者姓名： | 李宇 郭雷勇 陈建铭 谭洪舟 |
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| 作者单位： | 1. 广东药学院医药信息工程学院,广东,广州,510006
2. 中山大学信息科学与技术学院,广东,广州,510275 |
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| 基金项目： | 国家自然科学基金资助项目 |
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| 摘 要： | 在集中式多媒体音频会议中,混音算法决定了其混音输出语音质量的高低,而混音算法的实现要依靠同步混音转发机制的支持。对Perkins提出的混音循环缓冲区进行分析,提出一种适用于集中式多媒体音频会议系统的实时同步混音转发算法。该算法通过设置多个循环混音缓冲区,并对其实施同步控制来实现音频数据的混音、转发功能,并利用反映操作系统调度情况的声卡缓冲区数据长度确定每次混音处理的数据长度,以减轻操作系统调度对混音的影响。实验验证了此算法的可行性和稳定性。
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| 关 键 词： | 集中式多媒体会议系统 混音 循环缓冲区 同步 系统调度 |
| 收稿时间： | 2009-02-01; |
A Real-Time Synchronous Audio Mixing and Transmitting Scheme in Multimedia Conference System |
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| LI Yu,GUO Leiyong,CHEN Jianming,TAN Hongzhou.A Real-Time Synchronous Audio Mixing and Transmitting Scheme in Multimedia Conference System[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2010,49(2). |
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| Authors: | LI Yu GUO Leiyong CHEN Jianming TAN Hongzhou |
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| Institution: | LI Yu1,GUO Leiyong2,CHEN Jianming2,TAN Hongzhou2(1.College of Medical Information Engineering,Guangdong Pharmaceutical University,Guangzhou 510006,China,2.School of Information Science , Technology,Sun Yat-sen University,Guangzhou 510275,China) |
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| Abstract: | The audio mixing algorithm determines the quality of the mixing voice in the unicast based centralized multimedia conference system.However,the implementation of the mixing algorithm is based on the backup of synchronous audio mixing and transmitting mechanism.The circular mixing buffer(CMB) proposed by Perkins is analyzed,and then a real-time synchronous audio mixing and transmitting scheme is presented.This scheme is achieved by setting multi-CMBs and controlling them synchronously.The length of data used... |
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| Keywords: | centralized multimedia conference system audio mixing circular mixing buffer synchronization system scheduling |
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