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Old 06-18-2011, 11:23 AM   #1
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Default 曼彻斯特编码 差分曼彻斯特编码

在信号位开始时不改变信号极性,表示逻辑"1";






  差分曼切斯特编码比曼切斯特编码的变化要少,因此更适合与传输高速的信息,被广泛用于宽带 高速网中,ralph lauren polo shirts。然而,由于每个时钟位都必须有一次变化,所以这两种编码的效率仅可达到50%左右
在信号位中电平从高到低跳变表示1;
差分曼彻斯特编码的编码规则是:
在信号位中电平从低到高跳变表示0;



曼彻斯特编码的编码规则是:


曼切斯特和差分曼切斯特编码是原理基本相同的两种编码,后者是前者的改进。他们的特征是在传输的每一位信息 中都带有位同步时钟,因此一次传输可以允许有很长的数据位。
  曼切斯特编码的每个比特位在时钟周期内只占一半,当传输“1”时,在时钟周期的前一半为高电平,后一半 为低电平,ralph lauren polo who;而传输“0”时正相反。这样,Nike Lunar Rejuven8,每个时钟周期内必有一次跳变,这种跳变就是位同步信号。
  差分曼切斯特编码是曼切斯特编码的改进。它在每个时钟位的中间都有一次跳变,cheap polo shirts,传输的是“1”还是“0”,是在每个时钟位的开始有无跳变来区分的。



不论码元是1或者0,在每个码元正中间的时刻,一定有一次电平转换。
在信号位开始时改变信号极性,表示逻辑"0";
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