| 1. | A dynamic layered multicast scheme based on optimal layer rate allocation
一种基于最优层速率分配算法的动态分层多播方案 |
| 2. | The correctness and practicability of the dynamic bit rate allocation algorithm are verified by the analytical result of the experiment data
通过实验数据的分析，验证了动态位速率调整算法的正确性和实用性。 |
| 3. | 2 . when the existed dynamic bit rate allocation algorithms is working , the video data bit rate and the audio data bit rate are changed
2 )已有的动态速率调整算法在进行动态速率调整时，音、视频的位速率都要改变。 |
| 4. | An optimal subband rate allocation algorithm in mean - squared error ( mse ) minimization sense was proposed , which achieves persistent optimal rate - distortion performance under any given rate constrains
提出均方误差最小意义上的最佳三维子带码率分配算法，该算法在任意给定码率限制条件下都能获得最优率失真性能。 |
| 5. | Comparing with the existed dynamic bit rate allocation algorithms , the model can provide better audio data quality by adjusting the video data bit rate . this meets the requirement in remote education system
本模块只对视频位速率进行调整，保持音频位速率不变，保证音频质量，在一定程度能满足远程教育的需要。 |
| 6. | Combined in the environment of the videoconference system provided by beijing shixun inc , preliminary experiment of the dynamic bit rate allocation module has been conducted on the atm lines of the online education academy of sichuan university
本动态位速率调整模块与北京视讯公司的桌面视频会议系统相结合，在四川大学网络教育学院的租用的atm线路线进行了初步的实验。 |
| 7. | The topics in this thesis are analysing the drawbacks of current h . 323 videoconference systems and popular solutions of them , discussing the advantages of dynamic bit rate allocation model and its features . 5 sub - modules implement the model
该模型的实现是通过5个子模块( rtp连接建立模块、数据包接收模块、媒体播放模块、反馈信息分析模块和动态位速率调整模块)来完成。 |
| 8. | The features of the dynamic bit rate allocation model are listed below : 1 . the existed dynamic bit rate allocation algorithms that only involved the situations of data loss ca n ' t meets the requirement of the videoconference system
作者的动态位速率调整模块具有以下特点： 1 )已有的动态速率调整算法只考虑了发生loss时进行速率调整，在一定程度上不能满足视频会议系统的实际需要。 |
| 9. | Focusing on the flaw that the complexity is incompatible with performance in the existing code - rate allocation methods of the unequal loss protection system with transmission rate constraint , a new code - rate allocation method based on estimation is proposed
摘要针对现有传输码率约束抗丢包不等保护系统的码率分配方法不能兼顾复杂度和性能的缺陷，提出了一种基于估计的码率分配新方法。 |
| 10. | The dynamic bit rate allocation module receives relevant data from the loss rate of multi - media data packet , jitter , delay , and compares these data with predefined values to make one of these 3 decisions that : decrease the video bit rate ( stat = decrease ) , or maintain current video bit rate ( stat = hold ) , or increase video bit rate ( stat = inccease ) . the video bit rate will be adjusted according to the decision and the total bit rate is changed accordingly . in this way the impact of network environmental variation is settled , and consequently the adaptability of videoconference systems in remote education area is improved
整个模型从rtcp协议获得多媒体数据包丢失率( lossrate ) 、抖动( jitter ) 、延时( delay )的相关数据，这些数据与预先设定好的阀值作比较，得出减小视频位速率( stat = dectease ) 、维持视频位速率不变( stat = hold )或增大视频位速率( stat = increase )的决定，模块根据这些决定对视频位速率进行相应的调整，从而总的位速率也相应变化，这样可以减小由于网络环境变化而带来的影响，从而提高视频会议在远程教育应用中的实用性。 |
