The project uses for reference the algorithm thought of sbc ( subband coding ) to measure off the audio to the corresponding frequency width and encode it by the different sensitivity of human hearing , which results in the lower coding rate and bearable voice quality . the algorithm processing low bit - rate audio is designed to be self - adaptive by the situation of network . the component developped by that algorithm and project has already been used in the realtime interactive educational system 该方案借鉴sbc ( subbandcoding )子带编码算法思想，将音频按对人听觉敏感程度不同划分为相应的频带并进行相应的编码，从而得到较低的编码率和较好的语音质量，设计了可根据网络状况进行自适应的低带宽音频处理算法。
Mechanism and difficulty of current real - time transport technology are analyzed in this article , technologies such as multicast , real - time transport , resource reservation and error correction code technologies are studied in this dissertation . a method of improving the quality of real - time transport of multimedia data on network on where packet loss rate and packet error rate are high is provided 本文分析了现有网络数据实时传输的机理及面临的困难，研究了多播、实时传输、资源预留以及纠错编码等技术在实时传输中的应用，给出了在低带宽、包错误率和丢包率较高的网络中提高多媒体数据实时传输质量的方法，提出了带动态纠错编码的实时传输技术。
The standard is designed to give a new technical solution for a broad range of applications , such as very low bit rate conversational services and entertainment quality broadcast , interactive video - on - demand services etc . for the enhancement of the coding efficiencies , the new standard adopts new tools as following : multiple reference pictures , variable block - size with seven block sizes in motion prediction , quarter - pixel accuracy for motion vector , short word - length integer transform , context - adaptive entropy coding and loop filter deblocking H . 264 / avc标准支持从低带宽、高误码率的无线移动视频通信到高带宽、低误码率的有线视频广播等多种应用,因此,日益受到业界的关注。为了实现更高的编码效率, h . 264 / avc标准采用了很多新的编码技术,如多参考帧预测、多尺寸编码块模式、 1 / 4像素精度运动矢量、整数变换量化、基于内容的熵编码、新型帧内预测、去除方块效应的滤波器等。
