1、精選優質文檔-傾情為你奉上1. This electron beam sweeps across each line at a uniform rate，then flies back to scan another line directly below the previous one and so on，until the horizontal lines into which it is desired to break or split the picture have been scanned in the desired sequence 電子束以均勻的速率掃描每一行，然后飛速返

2、回去掃描下一行，直到把被掃描的圖像按所希望的順序分割成行。2. The technical possibilities could well exist，therefore，of nation-wide integrated transmission network of high capacity，controlled by computers，interconnected globally by satellite and submarine cable，providing speedy and reliable communications throughout the word 因此，

3、在技術上完全可能實現全國性的集成發送網絡。這種網絡容量大，由計算機控制，并能通過衛星和海底電纜實現全球互聯，提供世界范圍的高速、可靠的通信。3. Transit time is the primary factor which limits the ability of a transistor to operate at high frequency 渡越時間是限制晶體管高頻工作能力的主要因素4. The intensity of sound is inversely proportional to the square of the distance measured from the s

4、ource of the sound. 聲強與到聲源的距離的平方成反比。5. The attenuation of the filter is nearly constant to within 0.5 dB over the entire frequency band 該濾波器的衰減近于恒定, 整個頻帶內的變化在0.5 dB以內。6. At present, the state of most semiconductor device technology is such that the device design and process technology must be supple

5、mented by screening and inspection procedures, if ultimate device reliability is to be obtained and controlled 目前, 大多數半導體器件的技術尚未十分完善, 以至若要獲得并控制器件最終的可靠性, 就必須輔以篩選和檢驗, 以彌補設計和工藝技術之不足7. Bandwidth of transistor amplifiers vary from about 250 MHz in the L band to 1000 MHz in the X band 晶體管放大器的帶寬在L波段約為250 M

6、Hz, 在X波段為1000 MHz。8. The output of the differential amplifier is fed to the circuits output stage via an offset-compensation network, which causes the op-amps output to center at zero volts. The output stage takes the form of a complementary emitter follower, and provides a low-impedance output. 差動放

7、大級的輸出通過一個失調補償網絡與輸出級相連, 目的是使運放的輸出以0 V為中心。 輸出級采用互補的射極跟隨器的形式以使輸出阻抗很低9. Because of the very high open-loop voltage gain of the op-amp, the output is driven into positive saturation (close to +V) when the sample voltage goes slightly above the reference voltage, and driven into negative saturation (close

8、 to-V) when the sample voltage goes slightly below the reference voltage. 由于運放的開環電壓增益很高, 當取樣電壓略高于參考電壓時, 輸出趨向于正向飽和狀態(接近+V)。 當取樣電壓低于參考電壓時, 輸出趨向于負向飽和狀態(接近-V)。10. If the signal source were direct connected instead of capacitor coupled, there would be a low resistance path from the base to the negative s

9、upply line, and this would affect the circuit bias conditions. 如果信號源和電路不是用電容耦合而是直接相連，從基極到負電源線就會一個低阻通路，并且這將影響到電路偏置狀態11. The differential amplifier has a high-impedance (constant-current)“tail” to give it a high input impedance and a high degree of common-mode signal rejection. It also has a high-impe

10、dance collector (or drain) load, to give it a large amount of signal-voltage gain (typically about 100 dB).差動放大極有一個高阻抗的“尾巴”（恒流源）以提供高輸入阻抗和對共模信號的深度抑制，同時，它還具有一個高阻抗和集電極或漏極負載以提供高的信號電壓增益（典型的數據是100dB).12. On the other hand, a DC negative-logic system, as in Figure 3.6(b), is one which designates the more n

11、egative voltage state of the bit as the 1 level and the more positive as the 0 level. 另一方面, 如圖3.6(b)所示, 把比特的較低的電壓狀態記為1電平, 較高的電壓狀態記為0電平, 這樣的系統稱為直流負邏輯系統。13. For example, to represent the 10 numerals (0, 1, 2, , 9) and the 26 letters of the English alphabet would require 36 different combinations of 1s

12、 and 0s. Since 25<36<26, then a minimum of 6 bits per bite are required in order to accommodate all the alphanumeric characters. 例如，要表示09十個數字和英文字母表中的26個字母，就需要0和1的36種不同的組合。因為25<36>26,所以,為了能表示所有的字母和數字，要求每個字節最少要6個比特。14. A 1 signifies the existence of a positive pulse in a dynamic positive-l

13、ogic system; a negative pulse denotes a 1 in a dynamic negative-logic system; a 0 at a particular input (or output) at a given instant of time designates that no pulse is present at that particular moment. 在動態正邏輯系統中，1表示有一個正脈沖存在，而在負邏輯系統中，負脈沖表示為1。不管那種系統，某一時刻在某一輸入端（或輸出端）的0，均表示此刻無脈沖。15. Intergraded circ

14、uits are also classified according to their functions. Digital or logical IC are used as switches, they are either on or off. In computers the on and off states correspond to 0 or 1.Other IC is called linear or analog IC. 也可根據其功能不同對集成電路進行分類。 數字IC(也稱為邏輯IC)通常用作開關, 表示接通或關斷。 在計算機中, 接通和關斷狀態分別對應“0”或“1”。 另

15、一種IC被稱為線性或模擬IC。 16. The reduction in power dissipation is particularly important where a complex circuit is to be concentrated into a small space. The problem of extracting the heat generated in the circuit may then be a difficult one. 減小功率損耗是非常重要的, 其方法是將一個復雜的電子線路集成為一小塊。 這使得釋放電路工作時產生的熱量變成一個難題。17. Bo

16、th N-type and P-type semiconductors are made by treated materials, such as germanium and silicon with impurities such as arsenic and indium. N型半導體和P型半導體是利用雜質摻入純凈半導體而形成的, 如將雜質砷和銦摻入鍺和硅中18. In addition, the signal processor may also add parity bits to the digital word to provide channel coding so that

17、error detection and correction can be used by the signal processor in the receiver to reduce or eliminate bit errors that are caused by noise in the channel. 此外, 信號處理器還可以給數碼字加入奇偶校驗位, 即提供信道編碼, 使得接收機的信號處理器可以進行誤碼檢測和糾錯, 以減少或消除由信道噪聲所引起的誤碼。19. Furthermore, we shall prove that a minimum theoretical samplin

18、g frequency of order 6.8 kilohertz (kHz) is required to convey a voice channel occupying the range 300 Hz to 3.4 kHz. 而且我們將證明, 為了變換頻率范圍為300 Hz 3.4 kHz的話路信號, 理論上的最小采樣頻率為6.8 kHz。20. By comparison, most other forms of transmission systems convey the message information using the shape, or level of the

19、transmitted signal; parameters that are most easily affected by the noise and attenuation introduced by the transmission path. 相比之下, 許多其他形式的傳輸系統是利用被傳信號的波形或電平的高低來傳送信息的, 而這些參數又極易受到傳輸路徑中的噪聲和衰耗的影響。21. Depending on the relationship between the signal frequencies and the sampling rate, spectral inversion

20、may cause the shape of the spectrum in the baseband to be inverted from the true spectrum of the signal. 根據信號頻率和采樣頻率之間的關系的不同, 可能出現“頻譜反轉”現象基帶頻譜的形狀和信號真實頻譜的形狀正好相反。 22. The primary reason for processing real-world signals is to extract information from them. This information normally exists in the form of signal amplitude(absolute or relative), frequency or spectral content, phase, or timing relationships with respect to other signals. Once the desired information is extracted from the signal, it may be used in a number of ways. 對現實世界信號進行處理的主要原因是從中提取信息。這些信息通常以信號的幅度（絕對幅度或者相當幅度），頻率或頻