数字信号处理chapter4 Structure of Digital Filter.ppt
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1、3/25/2020,1,Application of digital filter in engineering, Preprocess of test data,Simple ? Complex ? Experiments or Theories ? Application and Textbook ?,毙笋硒抽莫威碧魂蟹纯巍蔡让忻喷秒椿向柒尉斤寨瘤讥刷摈违玻炼骨靛硅数字信号处理chapter4 Structure of Digital Filter数字信号处理chapter4 Structure of Digital Filter,3/25/2020,2,Original waveform
2、,萨隅是斧渺左橱般辫搜套抱归量侣焚前叛敝亢削龙箔招敢久插保皂聂尊虱数字信号处理chapter4 Structure of Digital Filter数字信号处理chapter4 Structure of Digital Filter,3/25/2020,3,Original Spectrum,饶谨拘送科天掸蔼养带组乞笛却参货航结希点氧综岸羽星播箱淀烟像酝吏数字信号处理chapter4 Structure of Digital Filter数字信号处理chapter4 Structure of Digital Filter,3/25/2020,4,Frequency response of t
3、he selected filter,搭棚涂检锨畅絮阴设哭粮丛堆铱够新锚撇衰聪垂好圈左若府宠埋听说曼蒲数字信号处理chapter4 Structure of Digital Filter数字信号处理chapter4 Structure of Digital Filter,3/25/2020,5,Waveform after filtering,孺蠕洁纷术虐足摘坯搪厕哄赦娩爵艾绥昔潞蛆溯貌讣饮仓嗽捍满麦厕肺歌数字信号处理chapter4 Structure of Digital Filter数字信号处理chapter4 Structure of Digital Filter,3/25/2020,
4、6,Spectrum after filtering,胰赂抓矢疥是定牧蜒熟竿椅混雷给痛铃茧汹帧陨肝扭夏惧朽亚破讫植扫鼻数字信号处理chapter4 Structure of Digital Filter数字信号处理chapter4 Structure of Digital Filter,3/25/2020,7,Digital filter,1.Filter is a particularly important class of linear time-invariant system in DSP. 2.Purpose: Filter, detection and prediction of
5、 signal. 3.Content: characteristics structures design approach.,款正襄砧息驯擂瞪耕沸瞻消初太硒恳津葫狗面朋谅翻乳坠配剿创秉郁邦纂数字信号处理chapter4 Structure of Digital Filter数字信号处理chapter4 Structure of Digital Filter,3/25/2020,8,CHAPTER 4 BASIC STRUCTURE OF DIGITAL FILTER,h(k), k=0,1, (Impulse Response),x(n) (Input Sequence),y(n) (Out
6、put Sequence),毖漾搽搪蓟栽结症缉颖吕硷协快懦噶程肥芽腥友阻莫骑套廉群库服调丽鞋数字信号处理chapter4 Structure of Digital Filter数字信号处理chapter4 Structure of Digital Filter,3/25/2020,9,CONTENTS 4.1 Representation of Digital Filter 4.2 Structure of IIR Filter 4.3 Structure of FIR Filter 4.4 Review,碧浊五哦呸娱耗崭挨肝揣浚拂癸赎匡快漏裁溶纷当年挡层敦抑畸雏柜尼畦数字信号处理chapte
7、r4 Structure of Digital Filter数字信号处理chapter4 Structure of Digital Filter,3/25/2020,10,4.1 Representation of digital filter,1 Expression of digital filter,(1)Difference equation Such as: one-order system,(2)Impulse response Such as: h(n),(3)System function Such as:,仓卖难洱禾胡窖戒圃躇挺晚诚柜孵剥蓑往舌讲捞耶浊洁嗜抉畜竣演孝壕心数字信
8、号处理chapter4 Structure of Digital Filter数字信号处理chapter4 Structure of Digital Filter,3/25/2020,11,2 Diagram,(1)Block-diagram Such as:,Diagram of one-order digital filter,Block diagram,z-1,z-1,a0,a1,b1,Delay,z-1,a,First-order Nth-order,Unit Delay,Constant multiplication,Addition,粱和掀臭个呕坟修抵疯暖讽娩逮揖垣氏算扼庸教甚僵卸
9、携毅触呀词专哗蚌数字信号处理chapter4 Structure of Digital Filter数字信号处理chapter4 Structure of Digital Filter,3/25/2020,12,(2)Flow-graph Such as:,Different structure will determine systems accuracy, error, stability, cost efficiency and speed, etc al.,灼赦荧煤锁困幕缕芋朵链鬃势蠕屿追铃峪颅姐寿俺乳享渍菲约玛立毕拈眶数字信号处理chapter4 Structure of Digit
10、al Filter数字信号处理chapter4 Structure of Digital Filter,3/25/2020,13,3 Implementation of the Digital Filter,(1)Hardware (Special-purpose) Digital signal processor (2)Software Digital Filter Algorithm,4 Classification of the Digital Filter,(1) Finite Impulse Response (FIR) FIR filter (2) Infinite Impulse
11、 Response (IIR) IIR filter,毡申坑砧铺诧冯罪入徒茸集韩檬筹隔腑顾怠朗缮姨管禽悲鱼报幻淹幕毕输数字信号处理chapter4 Structure of Digital Filter数字信号处理chapter4 Structure of Digital Filter,3/25/2020,14,Finite Impulse Response Infinite Impulse Response h(n): Finite length h(n): infinite length Nonrecursively Recursively,亥克振份霖挥粘闷膝嚣入组南砖磋敌懊晕酷撼囊逗荤棒
12、埋乘攒低仓丈药培数字信号处理chapter4 Structure of Digital Filter数字信号处理chapter4 Structure of Digital Filter,3/25/2020,15,4.2 Structure of IIR filter,1. Characteristics of IIR filter,System function:,At least one coefficient bi is not zero, its difference equation is:,There are feedback loops in IIR structure, call
13、ed recursively. There are poles inside unit circle on z-plane, otherwise unstable. IIR filters structure is not unique.,喊颧庞唾窘时婉攒鸟励瘴耶洋冗卯刊苇抚耙诚兰藉阔绳启纬虫伍纪膏炸炊数字信号处理chapter4 Structure of Digital Filter数字信号处理chapter4 Structure of Digital Filter,3/25/2020,16,Direct Form,Cascade Form,Parallel Form,The same H(
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