语音pcm编码解码

语音pcm，包括μ律pcm编码、解码、滤波

clear;
clc;
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%  语音信号  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
[Yfsbits]=wavread（‘yuyin.wav‘） %读出信号1，采样率和采样位数
sound（Yfsbits）;
N=40000;
% tt=[0.1:0.1:10];
t0=1/fs;
t=[t0:t0:N*t0];
df=fs/256;
f=[df:df:256*df];
x=Y（1:N）;
xf=fft（x）; %1024为数据点数，即对信号采样数据为1024点的处理
xf=fftshift（xf）;
subplot（211）;
plot（tx）;
title（‘语音信号时域波形图‘）;
subplot（212）;
plot（abs（xf））;
xlabel（‘频率/Hz‘）;
ylabel（‘振幅‘）;
title（‘语音信号的频域图‘）;
delta=1/（255*16）;
start_value=[01/2553/2557/25515/25531/25563/255127/255];    
% start_level=[0 16*delta 48*delta 112*delta 240*delta 496*delta 1008*delta 2032*delta];
interval=[delta2*delta4*delta8*delta16*delta32*delta64*delta128*delta];
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%μ律及μ律15折线%%%%%%%%%%%%%%%%%%

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     文件        4903  2013-11-17 12:13  pcmuu.m