通信基础知识
英文翻译
通信基础知识(中文2700字,英文2000字)
通信系统
一般的通信系统由下列部分组成：
（a）信息源。它产生消息，可以是写成的或口说的文字，或是某种形式的数据。
（b）发信机。发信机把消息转变为信号，信号形式要适合在通信信道中传送。
（c）通信信道。通信信道是用于从发信机传送信号到接收机的媒质。信道可以是无线电链路或者是直接的有线连接。
（d）接收机。接收机可以看作与发信机相反的东西。它把接收到信号变回成消息，并把消息传给终端，这个终端可以是一台扬声器、电传打字机、或一个计算机数据库。
所有通信信道的一个不好的特征是信号上都叠加了噪声。这种人们不希望存在的噪声会引起电话中声音失真，或者在电报报文或数据中出现的差错。
附录一：英文资料
Basic Knowledge of Communication
Communication System
A generalized communication system has the following components
(a) In formation Source .This produces a message which may be written or spoken words,or some form of data.
(b) Transmitter .The transmitter converts the message into a signal ,the form of which is sutiable for transmission over the communication channel. [资料来源：http://Doc163.com]
(c) Communication Channel .The communication channel is the medium used transmit the signal, from the transmitter to the receiver. The channel may be a radio link or a direct wire connection.
(d) Receiver . The receiver can be thought of as the inverse of the transmitter .It changes the received signal back into a message and passes the message on to its destination which may be a loudspeaker , teleprinter or computer data bank.
An unfortunate characteristic of all communication channels is that noise is added to the signal. This unwanted noise may cause distortions of sound in a telephone , or errors in a telegraph message or data.
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