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#include "F2407REGS_c.h" #include "math.h" extern signed long U_data_in[320]; // 10个周波AD采样数据，为长整数 signed long U_data_analog[32]; // 1个周波AD采样模拟数据 /***********************************************

Hardware API Selector: AT91SAM7A3 Definitions Analog

Hardware API Selector: AT91SAM7A3 Definitions Analog

function y = modmap(x, Fd, Fs, method, M, opt2, opt3) %MODMAP Maps digital signal to analog signal for modulation. % Y = MODMAP(X, Fd, Fs, METHOD, OPT1, OPT2, OPT3) maps a sample % freq

function [num,den]=FREQ2LEVY(H,w,na,nb) % FREQ2LEVY Analog filter weighted least squares fit to frequency response data % by Levy algorithm.. % [NUM,DEN]=FREQ2LEVY(H,W,NA,NB) gives real numera

Wp=0.2*pi;Ws=0.3*pi;Rp=1;As=16; Ripple=10^(-Rp/20);Attn=10^(-As/20); %Analog filter design: [b,a]=afd_chb2(Wp,Ws,Rp,As); %Chebyshev-2 Filter Order=4 %Calculation of second-order sections: [C,B

Wp=0.2*pi;Ws=0.3*pi;Rp=1;As=16; Ripple=10^(-Rp/20);Attn=10^(-As/20); %Analog filter design: [b,a]=afd_chb1(Wp,Ws,Rp,As) %Chebyshev-1 Filter Order=4 % Calculation of second-order sections: [C,B,A

function y = modmap(x, Fd, Fs, method, M, opt2, opt3) %MODMAP Maps digital signal to analog signal for modulation. % Y = MODMAP(X, Fd, Fs, METHOD, OPT1, OPT2, OPT3) maps a sample % freq

% Program P5_4 % Design of Analog Lowpass Filter clf; Fp = 3500;Fs = 4500; Wp = 2*pi*Fp; Ws = 2*pi*Fs; [N, Wn] = buttord(Wp, Ws, 0.5, 30,'s'); [b,a] = butter(N, Wn, 's'); wa = 0:(3*Ws)/511:3*W