求翻译：图1所示是数据通信系统的基本构成。在计算机通信中，通信双方传递的信息必须进行量化并以某种形式进行编码后才能进行传输。机内信号不论采用哪一种编码方法，它们的基本信号都是脉冲信号，为了减少信号在传输媒质上的通信带宽限制，以及噪音、衰减、时延等影响，也由于同步技术的需要，操作时都需要对简单的脉冲信号进行一些不同的变换，以适合传输的需要。这样就会产生许多不同的代码，通常有不归零电平(NRZ-L)码，逢“1”反转(NRZ-1)码，曼彻斯特码和差分曼彻斯特等。图2所示是部分编码方式的波形图。是什么意思？

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As shown in Figure 1 is a data communications system of the basic elements. In the Computer communications, both parties to a communication of information passed must be quantified in a coded form before it transfers. Whether or not the signal in a method of encoding the basic signals, and they are

As shown in Figure 1 is the basic structure of data communication system. In computer communication, the communicating parties that message must be quantified and encoded for transmission in some form. Machine signal regardless of the encoding method used, their basic signal is a pulse signal, in or