HDTV系统音视频显示时间标签同步生成和自适应交织策略

分析了MPEG—2系统中音视频数据的解码时序，以及理想解码器中的音视频同步原理，结合HDTV系统复用器的设计，提出了音视频PTS同步生成和基于具有相近PTS值的音视频访问单元在码流中相对位置的自适应交织策略。实验结果表明，该策略解决了码流速率高，特别是音频码率相对于视频码率较低时出现的音视频不同步和解码器缓，中区上溢或下溢问题，有效地降低了解码器缓冲区的容量和控制复杂度。

Synchronal Creation and Self-Adaptive Interlace Strategy of Video and Audio Presentation Time Stamps in HDTV System

With the research on timing model for video and audio in MPEG 2 system and the principle of video and audio synchronization, this paper presented synchronal creation of video and audio presentation time stamps(PTS) and a self adaptive interlace and synchronization strategy of video and audio in HDTV system multiplex. The strategy is based on the relative position of audio and video access units in bit stream, which is provided with closely PTS. Using the strategy, HDTV coder exports interlaced bit stream that can be perfectly decoded without decoder buffer overflow or underflow. In addition, the strategy is efficient for very lower audio's bit rate than videos and reduces the decoder buffer capacity and control complexity.