《专业英语考试重点.doc》由会员分享，可在线阅读，更多相关《专业英语考试重点.doc（3页珍藏版）》请在三一文库上搜索。
1、这是考试范围，第一道大题选十个单词或词组，第二道答题选十个缩写词，第三道答题选六段翻译 1.写出下列单词或词组的中文。multimeter insulation transistor rectifier spectrum binary antenna harmonics attenuation capacitance differential bandwidth propagation transmission optical fiberchannel multiplex modulation telecommunication impairment ULSI samplingquantizi
2、ng carrier encryption scheme trade off state of art performance envelope2.写出下列缩写的全称DSBFC ITU FFT IFFT LAN MAN WAN WWW HTTP GPRS ASCII ISDN ADSL IEEE ISO FET USB GSM CPU LCD CDMA 3. 将下列句子译成中文。The ratio of the capacitance with some material other than air between the plates, to the capacitance of the
3、same capacitor with air insulation, is called the dielectric constant of that particular material.A design for a general purpose VLSI frequency synthesizer is presented. It is shown that a simple basic design can have a fully professional performance. Some of the special requirements placed on the V
4、LSI technology are discussed. The original source information can be in analog (continuous) form, such as the human voice or music, or in digital (discrete) form, such as binary-coded numbers or alphanumeric codes. All forms of information, however, must be converted to electromagnetic energy before
5、 being propagated through an electronic communications system. In addition, the signal processor may also add parity bits to the digital word to provide channel coding so that error detection and correction can be used by the signal processor in the receiver to reduce or eliminate bit errors that ar
6、e caused by noise in the channel. Information theory is a highly theoretical study of the efficient use of bandwidth to propagate information through electronic communications systems. Information theory can be used to determine the information capacity of a communications system. Information capaci
7、ty is a measure of how much information can be transferred through a communications system in a given period of time.Modern communication systems use digital modulation techniques. Advancements in very large integration (VLSI) and digital signal processing (DSP) technology have made digital modulati
8、on less cost than analog transmission systems. Digital modulation offers many advantages over analog modulation.Some advantages include greater noise immunity and robustness to channel impairments, easier multiplexing of various forms of information (e. g., voice, data, and video), and greater secur
9、ity. Furthermore, digital transmissions accommodate digital error-control codes that detect and/or correct transmission errors, and support complex signal conditioning and processing techniques such as source coding, encryption, and equalization to improve the performance of the overall communicatio
10、n link. Some modulation schemes are better in terms of the bit error rate performance, while others are better in terms of bandwidth efficiency. Depending on the demands of the particular application, tradeoffs are made when selection a digital modulation.Telecommunications are the transmission of w
11、ords, sounds, images, or data in the form of electronic or electromagnetic signals or impulses. Transmission media include the telephone (using wire or optical cable), radio, television, microwave, and satellite. Data communication, the fastest growing field of telecommunication, is the process of t
12、ransmitting data in digital form by wire or radio.Digital data can be generated directly in a 1/0 binary code by a computer or can be produced from a voice or visual signal by a process called encoding. A data communications network is created by interconnecting a large number of information sources so that data can flow freely among them. The data may consist of a specific item of information, a group of such items, or computer instructions. Example includes a news item, a bank transaction, a mailing address, a letter, a book, a mailing list, a bank statement, or a computer program.