基于MATLAB的语音端点检测(2)

基于MATLAB的语音端点检测

axis([1 length(zcr) 0 max(zcr)])

ylabel('ZCR');

语音信号的端点检测matlab实现:

[x,fs,nbits]=wavread('song1.wav');

x = x / max(abs(x));%幅度归一化到[-1,1]

%参数设置

FrameLen = 256; %帧长

inc = 90; %未重叠部分

amp1 = 10; %短时能量阈值

amp2 = 2;

zcr1 = 10; %过零率阈值

zcr2 = 5;

minsilence = 6; %用无声的长度来判断语音是否结束

minlen = 15; %判断是语音的最小长度

status = 0; %记录语音段的状态

count = 0; %语音序列的长度

silence = 0; %无声的长度

%计算过零率

tmp1 = enframe(x(1:end-1), FrameLen,inc);

tmp2 = enframe(x(2:end) , FrameLen,inc);

signs = (tmp1.*tmp2)<0;

diffs = (tmp1 -tmp2)>0.02;

zcr = sum(signs.*diffs,2);

%计算短时能量

amp = sum((abs(enframe(filter([1 -0.9375], 1, x), FrameLen, inc))).^2, 2);

%调整能量门限

amp1 = min(amp1, max(amp)/4);

amp2 = min(amp2, max(amp)/8);

%开始端点检测

for n=1:length(zcr)

goto = 0;

switch status

case {0,1} % 0 = 静音, 1 = 可能开始 if amp(n) > amp1 % 确信进入语音段

x1 = max(n-count-1,1); % 记录语音段的起始点

status = 2;

silence = 0;

count = count + 1;