《Lesson11Filter电子技术专业英语教程》由会员分享，可在线阅读，更多相关《Lesson11Filter电子技术专业英语教程（38页珍藏版）》请在金锄头文库上搜索。
1、Lesson 11 Filter电子技术专业英语教程冯新宇 主编 电子工业出版社 Unit 4 Power Date1电子技术专业英语教程Lesson 11 Filter Backgrounds Text tour Language in use Vocabulary Structure Reading/writing techniquesDate2电子技术专业英语教程 Terminology Electronic filters IIR filter FIR filterBackgroundsDate3电子技术专业英语教程Terminology Date4电子技术专业英语教程 lowpass
2、 filter 低通滤波器 bandpass filter 带通滤波器 bandstop filter 带阻滤波器 frequency responses 频率响应 Date5电子技术专业英语教程Electronic filtersElectronic filters are electronic circuits which perform signal processing functions, specifically to remove unwanted frequency components from the signal, to enhance wanted ones, or b
3、oth. Electronic filters can be: passive or active analog or digital high-pass, low-pass, bandpass, band-reject (band reject; notch), or all-pass. discrete-time (sampled) or continuous-time linear or non-linear infinite impulse response (IIR type) or finite impulse response (FIR type) Date6电子技术专业英语教程
4、Electronic filters The most common types of electronic filters are linear filters, regardless of other aspects of their design. Date7电子技术专业英语教程IIR filter IIR filters may be implemented as either analog or digital filters. In digital IIR filters, the output feedback is immediately apparent in the equ
5、ations defining the output. Note that unlike with FIR filters, in designing IIR filters it is necessary to carefully consider “time zero“ case in which the outputs of the filter have not yet been clearly defined.Date8电子技术专业英语教程FIR filter A finite impulse response (FIR) filter is a type of a digital
6、filter. The impulse response, the filters response to a Kronecker delta input, is finite because it settles to zero in a finite number of sample intervals. This is in contrast to infinite impulse response (IIR) filters, which have internal feedback and may continue to respond indefinitely. The impul
7、se response of an Nth-order FIR filter lasts for N+1 samples, and then dies to zero. Date9电子技术专业英语教程 Outline Brief introduction (para.1-6) Lowpass Filters (para.7-8) Highpass Filters (para.9-10) Bandpass Filters (para.11- 13) Bandstop Filters (para.14- 15) Text tourDate10电子技术专业英语教程Brief introduction
8、 A filter can have a lowpass, highpass, bandpass, or bandstop response can also be described by the method used to approximate the ideal filter a filters primary purpose is to differentiate between different bands of frequencies hertz (Hz) or radians/second gain characteristics of the passband(s) an
9、d stopband(s) of the filter response. Date11电子技术专业英语教程Lowpass Filters four parameters: the passband gain apass, the stopband gain astop, the passband edge frequency fpass, and the stopband edge frequency fstop limit the high-frequency content of a signal Date12电子技术专业英语教程Highpass Filters eliminate lo
10、w frequencies from a signal Date13电子技术专业英语教程 pass a band of frequencies while attenuating frequencies above or below that band. load. the processing of voice signals Bandpass Filters Date14电子技术专业英语教程Bandstop Filtersa 60Hz notch filter used in sensitive measurement equipmenDate15电子技术专业英语教程 Vocabulary
11、 attenuation ,amplitude ,decibel ,passband,ripple, stress StructureLanguage in useDate16电子技术专业英语教程VocabularyDate17电子技术专业英语教程 the act of attenuating or the state of being attenuated the loss of energy suffered by radiation as it passes through matter, esp as a result of absorption or scatteringattenu
12、ation in dictionary Date18电子技术专业英语教程attenuation in textFor example, a lowpass filter would pass low frequencies with little attenuation (reduction in amplitude), while high frequencies would be significantly reduced. 举例来说，一个低通滤波器允许频率衰减很小的 低频信号通过（主要是振幅的衰减），然而对高 频信号来说，则会产生一个显著的减小。 Date19电子技术专业英语教程 att
13、enuation q 衰减q attenuation coeffcient 衰减系数 speed attenuation 转速衰减 attenuation features 衰减特征 attenuation zone 衰减区 paid attenuation 单调衰减 height attenuation 高衰减 attenuation equalizers 衰减均衡器 non attenuation 非衰减attenuation in use Date20电子技术专业英语教程 greatness of extent; magnitude 广阔, 广大 abundance or copious
14、ness充足, 丰富 breadth or scope, as of the mind (思想的)广度 the angular distance along the horizon measured from true east or west to the point of intersection of the vertical circle passing through a celestial body(天体)出没(磁)方位角 the maximum variation from the zero or mean value of a periodically varying quan
15、tity (起重机)作用半径 (交变电流的)幅度, (无线电波的)波幅; 调幅 (音波场中空气压力的)振幅, (钟摆持的)摆幅 (生物的类或群的)生态适应范围 射程amplitude in dictionary Date21电子技术专业英语教程 amplitude ratio 振幅比 amplitude anomalies 振幅异常 amplitude transformer 变幅杆 amplitude subdivision 幅值细分 instantaneous amplitude 瞬时振幅 large amplitude 大振幅 signal amplitude 信号幅度 voltage amplitude 电压幅值 amplitude modulator 调幅器 amplitude functions 振幅函数amplitude in use Date22电子技术专业英语教程 a unit for comparing two currents, voltages, or power levels, equal to one tenth of a bel a similar uni
