临沂大学2012级第二学期 综合英语-答案.docVIP

《综合英语》参考答案 一、Translate the following words and expressions（30 points）： 1. (1) bias 偏置 , (2) diode 二极管 , (3) distortion 失真 , (4) filter 滤波器 ,(5)impedance 阻抗 ,(6) decoder 解码器 , (7) debug 调试 ,(8)flip-flop 触发器 , (9)causality 因果性 , (10) convolution 卷积 , (11)algorithm 算法 , (12) luminance 亮度 , (13) refraction 折射 , (14) waveguide 波导 , (15) gray level 灰度 . 2. (1) 调协回路 tuned circuits ，（2）负反馈 negative feedback ， （3）移位寄存器 shift register ，（4）真值表 truth table ，（5）并行 parallel ， （6）微波 microwave ，（7）全向天线 omni-directional antenna ， （8）铜轴电缆 coaxial cable ，（9）光纤 optical fibre，（10）电信 telecommunication， (11) 光栅 grating ,（12）对比度 contrast ratio ，（13）象素 pixel , （14）幻灯片 transparency ，（15）分解方程 analysis equation 。 二、Close.（10 point）： The purpose of a receiver is to select a desired group of frequencies from one transmitter, get rid of all unwanted signals and noise, and then demodulate the signal to obtain the modulating information. All incoming signals are mixed with the output of a local oscillator and the difference frequency is selected and amplified by the intermediate frequency amplifiers. In a typical system the transmitter terminal will contain an input transducer which converts the speech pressure waves in the air into an electrical signal. This input transducer is commonly called a microphone. 三. Translate the following sentences into Chinese. (40 points) For each type of modulation used (i.e., AM, FM, SSB, PM), a number of different circuits exist. Some will have gain, others a loss. 对于所应用的各种调制方式（如调幅、调频、单边调和脉冲调制），都有一些不同的电路。一些可获得增益，另一些则插入损耗。 2. Some discrimination against unwanted mixing products can therefore be had if all RF input levels to the mixer are kept as low as possible and the local oscillator signal kept as high as possible. 如果到混频器的所有射频输入电平都保持尽可能的低，并且本振信号尽可能的高，就能对一些不期望的混频分量抑制。 The analog world is full of relative numbers, tr