通信专业英语期末复习

Unit１

【中译英】

(1)信号:signal (2)波特率:the baud rate (3)单工:simplex (4)同步:synchronous (5) 信道:communications channel (6) 模拟:analog (7) 数字:digital (8) 电磁的:electromagnetic (9) 串行口:serial port (10) 带宽:bandwidth

【英译中】

(1)baud:波特(2) asynchronous:异步的(3) full duplex:全双工(4) parallel:并行(5) electromagnetic:电磁的

(6) discrete:离散的(7) simultaneously:同时发生地(8) parity:奇偶校验

【句子翻译（英译中）】

1. Since transmitted data can be assigned to different frequencies,the wider the bandwidth,the more the frequencies,and the more data can be transmitted at the same time.

因为传输的数据能被分配到不同频率，所以带宽越宽频率越多，同一时间能被传输的数据就越多。

2. To distinguish where one character stops and another starts,the asynchronous communication mode uses a start and a stop bit.

为了辨别一个字符在什么地方结束而另一个字符在什么地方开始，异步通信模式使用一个起始位和一个结束位。3. More technical manes for the serial port are RS-232C connector and asynchronous communication port.

串行端口技术上又叫做RS-232C连接器和异步通信接口。

【段落翻译（英译中）】

The third is the transmission mode. Transmission modes include the asynchronous mode and the synchronous mode. In the asynchronous transmission mode, individual characters (made up of bits) are transmitted at irregular intervals, for example. When a user enters data. To distinguish where one character stops and another starts, the asynchronous communication mode uses a start and a stop bit. An additional bit called a parity bit is sometimes included at the end of each character. Parity bits are used for error checking. The asynchronous transmission mode is used for lower speed data transmission and is used with most communication equipment designed for personal computers.

第三是传输模式。传输模式包括异步和同步。在异步传输模式中，单独的字符(由比特组成)以不规则的时间间隔传输，例如当用户输入数据时。为了辨别一个字符在什么地方停止而另一个字符在什么地方开始，异步通信模式使用一个起始位和一个停止位。一个称为奇偶位的附加位有时包含在每个字符的末端。奇偶位用于错误校验。异步传输模式用于低速数据传输以及用在设计适合个人计算机的大多数的通信设备中。

[第一段翻译]

The need to communicate is part of man’s nature. Since the beginning of time man has used different techniques and methods to communicate. Circumstances and available technology have dictated the method and means of communications. Date communication concerns itself with the transmission (sending and receiving) of information between two parties. Now let’s learn the foundation knowledge of data communication.

通信是人类固有需求的一部分，人类一开始就使用不同的技术和方式进行交流，而环境和可利用的技术也限定了人类通信的方法和方式。数据通信涉及在通信双方间传递信息。现在我们共同来学习关于数据通信的基本知识。

Unit 3

【中译英】

（1）载波：Carrier Frequencies （2）多路复用：Multiplexing

（3）载波振荡频率：the frequency at which the station’s carrier oscillates （4）频分复用：Frequency Division Multiplexing （5）旋转开关：round-robin scheme （6）时分复用：Time Division Multiplexing

【缩写翻译】

FDM：Frequency Division Multiplexing 频分复用

TDM：Time Division Multiplexing 时分复用

【句子翻译（英译中）】

（1）In fact，a channel number is merely shorthand for the frequency at which the station’s carrier oscillates.