The other alternative is to embed the clocking information in the signal. For digital signals, this can be accomplished with Manchester or Differential Manchester encoding For analog signals, a number of techniques can be used; for example the carrier frequency itself can be used to synchronize the receiver based on the phase of the carrier 每个数据块以一个“前同步码( preamble)”开始,用 个“后同步”码( postamble)”结束。此外,数据中的控 制信息中也有一部分是起同步作用的 方法(如何让接收器判断数据块的开始和结束) 网络通信 9网络通信 9 The other alternative is to embed the clocking information in the signal. For digital signals, this can be accomplished with Manchester or Differential Manchester encoding. For analog signals, a number of techniques can be used; for example, the carrier frequency itself can be used to synchronize the receiver based on the phase of the carrier. 每个数据块以一个“前同步码（preamble）”开始，用一 个“后同步”码（postamble）”结束。此外，数据中的控 制信息中也有一部分是起同步作用的。 – 方法（如何让接收器判断数据块的开始和结束）