?? mula_pcm.m
字號:
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));
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