【摘要】 平滑、流畅的语音交流是当前高性能视频会议系统追求的主要目标之一 .为此 ,提出并实现了一种基于分组网络的多点实时语音混合及调度算法 .调度算法采用了排队模型分析、多点语音流的同步控制、数据预取以及缓冲区定时刷新等策略 ,在有限的复杂度内有效地保证了混合后语音的连续性 .同时 ,采用的混合方法保证了语音质量的自然度和可理解性 .算法的实现使得在多点情况下 ,此 H.32 3视频会议系统比现有国外同类 H.32 3产品 (如 Netmeeting等 )具有更好的语音听觉效果 .更多还原

【Abstract】 Smooth and fluent speech communication is one of the main aims of current high performance video conferencing system. For this purpose, a multipoint real time speech mixing and scheduling algorithm based on packet network is put forward and then realized. The scheduling algorithm, which contains several strategies, such as queue model analysis, synchronous control of multipoint speech streams, data pre fetching, timely refreshing buffers and so on, effectively guarantees continuity of the mixed speech in a limited complexity, and its mixing method has proved to ensure naturalness and intelligibility of the mixed speech quality. The realization of this algorithm has led to a fact that the video conferencing system has better hearing perceptibility than those available oversea H.323 products, such as Netmeeting, based on the same H.323 specification.更多还原