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ID:307933
大小:211.00 KB
页数:15页
时间:2017-07-21
《基于Matlab软件的数字滤波器设计方法-》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、摘要本文分析了国内外数字滤波技术的应用现状与发展趋势,介绍了数字滤波器的基本结构,在分别讨论了IIR与FIR数字滤波器的设计方法的基础上,指出了传统的数字滤波器设计方法过程复杂、计算工作量大、滤波特性调整困难的不足,提出了一种基于Matlab软件的数字滤波器设计方法,完成了高Q值50Hz带通IIR滤波器的设计,达到了通带45-55Hz,衰减小于3db,阻带40-60Hz,衰减大于80db的参数指标。文中深入分析了该滤波器系统设计的功能特点、实现原理以及技术关键,阐述了使用MATLAB进行带通滤波器设计及仿真的具体方法。最后把整个设计方案用VHDL语言进行了
2、描述并在Modelsim上仿真。Modelsim与Matlab的仿真结果对比说明该设计准确性好,可精确到小数点后六位,稳定后误差小于万分之一;可移植性强,在实际应用中,可根据不同的阶数、精度和速度等要求对IIR滤波器系数进行灵活的修改,以实现任意阶数的IIR滤波器。因此,该设计方法可靠性好,效率高,极大的减轻了工作量,有利于滤波器设计的最优化。关键词带通滤波器;IIR;Matlab;VHDL;Modelsim仿真;13AbstractThispaperanalyzesthesituationofapplicationanddevelopmentofdigi
3、talfiltertechnologyhomeandabroad.Itintroducesthebasicstructureofadigitalfilter,discussesdifferentdesignmethodsofFIRandIIRfilter,andpointsoutthatthetraditionaldesignmethodofdigitalfilterisnotonlycomplexbutalsoofheavyworkload,evenadjustmentoffilteringparametrerisverydifficult.Soitbr
4、ingsforwadanotherdesignmethodofdigitalfilterwhichbasedontheMatlabsoftwareandModelsimsoftware.ThispaperintroducesthedesignmethodofahighQvalueband-passIIRfilterwhichmeetsthegivenstandard--thepassbandis45-55Hz,withattenuationoflessthan3db;thestopbandis40-60Hzwithattenuationgreatertha
5、n80db.Itdeeplyanalyzesthedesignfeaturesandprinciplesofthefiltersystemandthekeytechnicalinthedesign.ThenitdescribstheuseofMatlabindesignandsimulationofthebandpassfiltedesign.Intheend,theprocedurewassimulatedonModelsim.SimulationresultsofModelsimandMatlabcomparedtomakeproofoftheaccu
6、racyofthedesign.Itisprovedthatthedesigncanbeaccurateatthesixthdecimalplace,stableerroriswithinonetenthousandth;Thedesignhasgoodportabilityandwidelypracticalapplication.Indifferentapplications,accordingtodifferentperformancerequirementsoforder,speedandaccuracy,etc,theIIRfiltercoeff
7、icientscanchangeflexiblytomakeupofIIRfilterofarbitraryorder;Inaddition,VHDLprocedurecanalsomakecertainoptimizations,accordingtothedifferentactualsituation,toachievegreaterspeedorconservationofFPGAresources.Keywords digitalfilterIIRMatlabVHDLModelsimsimulation13第一章绪论1.1数字滤波器的研究背景与意
8、义当今,数字信号处理(DSP:DigtalSignalProces
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