Chapter 2 describes the system part of MPEG-2 standard with focuses on PSI (Program Specific Information) and PCR (Program Clock Reference).
第二章主要讲述了MPEG - 2标准系统层规范，着重介绍节目特殊信息PSI和节目时钟参考pcr。
Ideally, both programs use the same reference clock, such as the application server's clock.
理想情况，两个程序都使用相同的参照时钟，比如应用服务器的时钟。
Single frequency source is usually used as local oscillator in communication system and radar system, also as a reference clock in digital circuits, so it is a extensive-applied technique.
固定频率源可以在在通讯系统和雷达系统中作为本机振荡器，也可以作为数字电路的基准时钟信号，因此得到了广泛的应用。
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