摘要
音视频同步是数字电视系统中实现实时解码的难点。讨论MPEG -2传输码流中的时间信息在音视频同步中的作用 ,详细介绍两种MPEG -2系统时序时钟的恢复方法———锁相环同步和异步置数法 ,给出处理音视频同步的实际方法 ,采用跳帧或者重复帧的纠正措施。其算法及几个主要电路设计适用于各种MPEG -2解码器。
Synchronization of audio/video is one of the difficulties in digital TV system real-time decoding. The timing information in MPEG-2 transport stream and its function on synchronizing the audio and video is pointed out in this paper. Two methods to recover the system time clock are discussed in detail: a synchronization scheme by PLL and a simple non-PLL digital scheme. Using the repeat frame and skip frame manner to make it resynchronized when losing synchronization with audio and video in decoding process. The algorithm and several circuit designs here are proper for all kinds of MPEG-2 decoders.
出处
《中国有线电视》
北大核心
2004年第11期17-19,共3页
China Digital Cable TV
