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數字信號處理DSP實驗四報告.doc


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數字信號處理DSP實驗四報告.doc
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數字信號處理DSP實驗四報告.docExample:DesignofaButterworthLowpassDigitalFilterbyusingbilinearmethodbandpassattenuation1dBbandstopattenuation40dBbandpassedgefrequency400hzbandstopedgefrequency500hzsamlingfrequency2000hzclc;clearallRp=1;%bandpassattenuationindB帶通衰減帶通截至頻率帶阻截至頻率采樣頻率Rs=40;%bandstopattenuationindB 帶阻衰減OmegaPl_l=400;%bandpassedgefrequencyOmegaSl_l=500;%bandstopedgefrequencyFp=2000;%samlingfrequency%changeanalogfrequencytodigitalangularWpl=2*pi*0megaPl_l/Fp;frequencyWs1=2*pi*OmegaSl_l/Fp;%changeanalogfrequencytodigitalangular數字參數frequency0megaPl=2*Fp*tan(Wpl/2);%nonlinearlization轉換為模擬參數OmegaS1=2*Fp*tan(Wsl/2);%a_P=OmegaPl/OmegaPl;%a_S=OmegaSl/OmegaPl;%Normalization 一化Lemta_P_EquivalentLowPass=Eta_P;%changetotheequivalentLowpasspatameterLemta_S_EquivalentLowPass=Eta_S;%%changetotheequivalentLowpasspatameter 變量命名%EstimatetheFilterOrder[N,Wn]=buttord(Lemta_P_EquivalentLowPass,Lemta_S_EquivalentLowPass,Rp,Rs,1s1);%DesigntheFilter[numl.deni]=butter(N.Wn,1s1);[num2.den2]=lp21p(numl,deni,OmegaPl);[num,den]=bilinear(num2,den2,Fp);%Computethegainresponsew=0:pi/255:pi;h=freqz(num,den,w);g=20*logl0(abs(h));%Plotthegainresponsefigure;plot(w/pi,g);gridaxis([01-605]);xlabel(|\omegm/\pi');ylabelLGainindB1);title(1GainResponseofaButterworthLowpassFilter1);result:GainResponseofaButterworthLowpassFilter0-10-20-30-40-50-600 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1cd/k8Pu一weeExperiment:1DesignofaChebylH 內容來自淘豆網www.eawpme.live轉載請標明出處.
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