如何用MATLAB编写双线性变换法答:[num,den]=butter(N,wc,'s');[numt,dent]=lp2bs(num,den,w0,B);[numd,dend]=bilinear(numt,dent,Fs);w=linspace(0,pi,512);h=freqz(numd,dend,w);norm=max(abs(h));numd=numd/norm;subplot(2,2,1);plot(w/pi,20*log(abs(h)/norm));grid;xlabel('Butterworth BS DF')...