关键词: 3G, 跨平台, 多方会议, 静音检测, 混音

Abstract: Based on the practical application and the characteristics of some small devices, such as PDA, a new and simple fast real-time adaptive cross-platform conference scheme was put forward. In the proposed scheme, priority was decided by probability, namely, the client calculated its audio probability according to energy value and the coded frame length, then the server decided the current speakers and mixed the streams by audio probability, finally transmitted mixed packages. The scheme skillfully offsets the weak computation of PDA and other small devices, at the same time reduces the calculation complexity of the server. The simulation results show that the proposed scheme has a low complexity and good hearing perceptibility. It can be easily implemented in hardware, such as PDA and mobile phone, and can be widely applied in cross-platform multimedia conference system.

Key words: 3G, cross-platform, multi-party conference, Voice Activity Detection (VAD), audio mixing