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function [b,a]=u_elipap(N,Rp,As,Omegac); % b=numerator polynomial coefficients % a=denominator polynomial coefficients % N=Order of the Elliptic Filter % Rp=Passband Ripple in dB;Rp>0

function [b,a]=u_buttap(N,Omegac) [Z,P,K]=buttap(N); P=P*Omegac; K=K*Omegac^N; B=real(poly(Z)); b0=K; b=K*B; a=real(poly(P));

function[sqnr,a_quan,code]=u_pcm(a,n) %u_pcm 一个序列的均匀PCM编码 %[sqnr,a_quan,code]=u_pcm(a,n) %a=输入序列 %n=量化级数的数目（偶数） %sqnr=输入信号量化噪声比（以dB为单位） %a_quan=编码前的量化输出 %code=编码后的输出 amax=max(abs(a)); a_q