gusucode.com > 现代通信系统——使用MATLAB(+全部程序) > 现代通信系统——使用MATLAB(+全部程序)/现代通信系统——使用MATLAB(+全部程序)/Matlab 程序/Chapter4/Mula_pcm.m
function [sqnr,a_quan,code]=mula_pcm(a,n,mu) %MULA_PCM mu-law PCM encoding of a sequence % [SQNR,A_QUAN,CODE]=MULA_PCM(A,N,MU). % a=input sequence. % n=number of quantization levels (even). % sqnr=output SQNR (in dB). % a_quan=quantized output before encoding. % code=the encoded output. [y,maximum]=mulaw(a,mu); [sqnr,y_q,code]=u_pcm(y,n); a_quan=invmulaw(y_q,mu); a_quan=maximum*a_quan; sqnr=20*log10(norm(a)/norm(a-a_quan));