【摘要】 给出了三种多媒体电视会议的共享白板系统一致性的定义，提出了一个基于令牌的共享白板通信算法，算法的核心是使用一个循环传递的令牌来分配白板绘图消息的局部序号和全局序号，控制消息发送和处理的顺序，从而保证用户白板在外观上的一致．该算法对于三种一致性均能满足．更多还原

【Abstract】 It is crucial to keep the consistency of all the users sensation when designing a share whiteboard in TV conference system. Three types of consistency concept are defined in the paper. Based on a token, a share whiteboard communication algorithm supporting the consistency is designed. The key point of the algorithm is using a circulating token to allocate the local number and global number of whiteboard messages and control their sending and processing sequence. Therefore, the appearing consistency of users whiteboard is ensured. It is proved that the algorithm satisfies all types of consistency.更多还原