《通信英语》综合练习题（即课后练习题）
（第一章）
•请将下述词组译成英文：
抽样量化与编码 | 话路 | 幅值 | 抽样频率 |
抽样速率 | 脉冲流 | 重复率 | 编码过程 |
模拟信号 | 传输质量 | 数字通信 | 数字传输 |
含噪声的环境 | 传输路由 | 信噪比 | 信号电平 |
地面系统 | 噪声功率 | 二进制传输 decoder | 反向操作 |
8位码序列 | 接收端 | 帧格式 | 同步宁 |
二•请将下述词组译成中文：
1.the schemes for performing these three functions
2.the series of amplitude values
3.the speech channel of telephone quality
4.the sequence of 8~binary digits
5.the minimum theoretical sampling frequency
6.the voice channel occupying the range 300 Hz to 3. 4 kHz
7.the 8~digits per sample value
8.the sparking of a car ignition system
9.the stream of the pulses with a repetition rate of 64 kHz
10.the relationship of the true signal to the noise signal
11.the signal received from a satellite
12.the complete information about a particular message
13.the shape of the transmitted signal
14.the a/ttenuation introduced by transmission path
15.the unit that converts sampled amplitude value to a set of pulses
16.the sequence relating to channel 1, 2 and so on
17.the unique sequence of pulses called synchronization word
18.the terrestrial system
19.the presence or absence of the pulse
20.the high-speed electronic switch
21.the time division multiplexer
22.the Time Division Multiplexing
五.请将下述短文译成中文：
1.If we consider binary transmission, the complete information about a particular message will always be obtained by simply detecting the presence or absence of the pulse. By comparison, most other forms of transmission systems convey the message information using the shape, or level of the transmitted signal; parameters that are most easily affected by the noise and attenuation introduced by the transmission path. Consequently there is an inherent advantage for overcoming noisy environments by choosing digital transmission.
2.The reader may ask, how does the demultiplexer know which group of 8~digits relates to channel 1, 2, and so on? Clearly this is important! The problem is easily overcome by specifying a frame format, where at the start of each frame a unique sequence of pulses called the frame code, or synchronization word, is placed so as to identify the start of the frame. A circuit of the demultiplexer is arranged to detect the synchronization word, and thereby it knows that the next group of 8~digits corresponds to channel 1.
3.Noise can be introduced into transmission path in many different ways; perhaps via a n
earby lightning strike, the sparking of a car ignition system, or the thermal low-level noise within the communication equipment it self. It is the rela tio nship of the t rue signal to the noise signal, known as the signal一to-noise ratio, which is of most interest to the communication engineer・
4.Basically, if the signal is very large compared to the noise level, then a perfect message can take place; however, this is not always the case. For example, the signal received from a satellite, located in far outer space, is very week and is at a level only slightly above that of the noise・ Alternative examples may be found within terrestrial systems where, although the message signal is strong, so is the noise power・
5.So far we have assumed that each voice channel has a separate coder, the unit that converts sampled amplitude values to a set of pulses; and decoder, the unit that performs the reverse operation. This need not be so, and systems are in operation where a single codec is shared between 24, 30, or even 120 separate channels.
6.A high-speed electronic switch is used to present the analog information signal of each
channel, taken in tern, to the codec. The codec is then arranged to sequentially sample the amplitude value, and code this value into the 8 - dig it sequence. Thus the output to the codec may be seen as a sequence of 8 pulses relating to channel 1, then channel 2, and so on. This unit is called a time division multiplexer.
（第九章）
一.请将下述词组译成英文：
个人通信 | 通信标准 | 固定电话业务 | 网络容量 |
移动交换中心 | 国际漫游 | 宽带业务 | 接口转换 |
频谱分配 | 模拟方式 | 蜂窝通信原理 | 拥塞 |
蜂窝裂变 | 移动交换中心 | 寄存器 | |
收费功能 | 接入方法 | 突发脉冲传输方式 | 开销信息 |
切换算法 | 短消息服务 | 技术规范 | |
二.请将下述词组译成中文：
1.the total access communication system
2.the global mobile communication system
3.the time division multipie access
4.the facsimile and short message service
5.the fixed communication networks
6.the more personalized system
7.the cost and quality of the link
8.the market growth
9.the fixed telephone service
10.the coaxial cable
11.the interface conversion
12.the cellular communication principle
13.the frequency reuse and cell splitting
14.the cochannel interference
15.the theoretical spectral capability
16.the micro-cellular system
17.the base station transceiver
18.the subscriber register
19.the burst transmission mode
20.the overhead information
21.the advanced handover algorithms
22.the facsimile and short message service
23.the GSM technical specifications
五.请将下述短文译成中文：
1.The success of mobile systems across the world is a sign that communication is moving to wards a more personalized, convenie nt sys tem. People who have to use a mobile phone on business soon begin to realize that the ability to phone any time, any place in one' s personal life rapidly becomes a necessity, not a convenience.
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