一種橢圓帶通IIR數(shù)字濾波器設(shè)計(jì)
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數(shù)字濾波器|無(wú)線(xiàn)單位沖激響應(yīng) |
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2009-04-14 21:20:00 |
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畢業(yè)設(shè)計(jì) 一種橢圓帶通IIR數(shù)字濾波器設(shè)計(jì) 共23頁(yè),9336字
摘要:當(dāng)前我們正處于數(shù)字化時(shí)代,數(shù)字信號(hào)處理技術(shù)受到了人們的廣泛關(guān)注,其理論及算法隨著計(jì)算機(jī)技術(shù)和微電子技術(shù)的發(fā)展得到了飛速的發(fā)展,被廣泛應(yīng)用于語(yǔ)音圖象處理、數(shù)字通信、譜分析、模式識(shí)別、自動(dòng)控制等領(lǐng)域。數(shù)字濾波器是數(shù)字信號(hào)處理中最重要的組成部分之一,幾乎出現(xiàn)在所有的數(shù)字信號(hào)處理系統(tǒng)中。數(shù)字濾波器是指完成信號(hào)濾波處理的功能,用有限精度算法實(shí)現(xiàn)的離散時(shí)間線(xiàn)性非時(shí)變系統(tǒng),其輸入是一組(由模擬信號(hào)取樣和量化的)數(shù)字量,其輸出是經(jīng)過(guò)變換的另一組數(shù)字量。相對(duì)于模擬濾波器,數(shù)字濾波器沒(méi)有漂移,能夠處理低頻信號(hào),頻率響應(yīng)特性可做成非常接近于理想的特性,且精度可以達(dá)到很高,容易集成等,這些優(yōu)勢(shì)決定了數(shù)字濾波器的應(yīng)用越來(lái)越廣泛。同時(shí)DSP(數(shù)字信號(hào)處理器)的出現(xiàn)和FPGA的迅速發(fā)展也促進(jìn)了數(shù)字濾波器的發(fā)展,并為數(shù)字濾波器的硬件實(shí)現(xiàn)提供了更多的選擇。
IIR數(shù)字濾波器是數(shù)字濾波器中非常重要的一類(lèi)慮波器,因其可以較低的階次獲得較高的頻率選擇特性而得到廣泛應(yīng)用。本文研究了IIR數(shù)字濾波器的常用設(shè)計(jì)方法,在分析各種IIR實(shí)現(xiàn)結(jié)構(gòu)的基礎(chǔ)上,利用MATLAB針對(duì)并聯(lián)型結(jié)構(gòu)的IIR數(shù)字濾波器做了多方面的仿真,從理論分析和仿真情況確定了所要設(shè)計(jì)的IIR數(shù)字濾波器的實(shí)現(xiàn)結(jié)構(gòu)以及中間數(shù)據(jù)精度。
關(guān)鍵詞: 數(shù)字濾波器 無(wú)線(xiàn)單位沖激響應(yīng) MATLAB
Abstract: At present, we are in the digital era, digital signal processing technology by the people’s attention, along with its theory and algorithms of computer technology and micro-electronics technology has been rapid development has been widely used in image processing voice, digital Communications, spectral analysis, pattern recognition, automatic control and other areas. Digital filter digital signal processing is the most important part of almost all in the digital signal processing systems. Digital filter is the completion of the signal processing functions of filtering, with limited accuracy algorithm of discrete-time non-linear time-varying systems and their input is a set (by the analog signal sampling and quantitative) figures, its output is a transformation The volume of a different set of figures. As opposed to analog filters, digital filters do not drift, to deal with low-frequency signal, the frequency response characteristics can be made very close to the ideal characteristics, and can reach very high precision, easy integration, which determines the advantages of digital filter applications More and more. At the same time, DSP (digital signal processor) and the emergence of the rapid development of the FPGA also promoted the development of the digital filter, and hardware implementation of digital filters to provide more choice.
IIR digital filter in the digital filter is very important to consider a class of wave, because of their lower-order can be obtained at a higher frequency selectivity and widely used. In this paper, the IIR digital filter design methods commonly used in the analysis of the realization of IIR structure on the basis of MATLAB for the use of parallel structure of the IIR digital filter has done a wide range of simulation, from the theoretical analysis and simulation to determine the circumstances to be IIR digital filter designed to achieve the accuracy of the data structure as well as in the middle.
Key words: digital filter Wireless unit impulse response MATLAB
1 IIR濾波器理論分析設(shè)計(jì) 5
1.1 IIR數(shù)字濾波器基本理論 5
1.2 IIR數(shù)字濾波器的幅頻特性 7
1.3 IIR數(shù)字濾波器的相頻特性 8
1.4 IIR數(shù)字濾波器的實(shí)現(xiàn)結(jié)構(gòu) 8
1.4.1直接型結(jié)構(gòu) 8
1.4.2 級(jí)聯(lián)型結(jié)構(gòu) 9
1.4.3 并聯(lián)型結(jié)構(gòu) 10
2 IIR數(shù)字濾波器分析設(shè)計(jì) 11
2.1 IIR數(shù)字濾波器的性能指標(biāo)要求 11
2.2 IIR數(shù)字濾波器常用設(shè)計(jì)方法介紹 11
2.2.1 S-Z變換…………………………………………………………………………11
2.2.2標(biāo)準(zhǔn)Z變換 12
3 橢圓帶通IIR濾波器設(shè)計(jì)以及MATLAB工具箱仿真 14
3.1 橢圓帶通IIR數(shù)字濾波器的MATLAB設(shè)計(jì) 14
3.2 橢圓帶通IIR數(shù)字濾波器的相頻特性與群時(shí)延分析 15
3.2.1 橢圓帶通IIR濾波器的相頻特性分析 15
3.2.2 橢圓帶通IIR濾波器的群時(shí)延分析 17
3.3 橢圓帶通IIR數(shù)字濾波器的穩(wěn)定性分析與設(shè)計(jì) 18
3.3.1 橢圓帶通IIR濾波器的穩(wěn)定性分析 18
3.3.2 橢圓帶通IIR濾波器的穩(wěn)定性設(shè)計(jì) 19
3.4 橢圓帶通IIR數(shù)字濾波器的量化精度設(shè)計(jì) 20
3.4.1輸入量化精度 20
3.4.2系數(shù)量化精度 21
4 橢圓帶通IIR數(shù)字濾波器的MATLAB程序及仿真圖 21
5 總結(jié) 22
參考文獻(xiàn) 23
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