vad.rar_vad_vad matlab_vad检测_短时过零率_语音端点检测

clc; clear all; path(path,'D:\setup\matlab\voicebox') x1=wavread('2.wav'); x=x1'; x=double(x); x=x/max(abs(x)); framelen=240; frameinc=80; amp1=10; amp2=2; zcr1=10; zcr2=5; maxsilence=3; minlen=15; status=0; count=0; silence=0; tmp1=enframe(x(1:length(x)-1),framelen,frameinc); tmp2=enframe(x(2:length(x)),framelen,frameinc); signs= (tmp1.*tmp2)<0; diffs= abs(tmp1-tmp2)>0.02; zcr=sum(signs.*diffs,2); amp=sum(abs(enframe(filter([1-0.9375],1,x),framelen,frameinc)),2); amp1=min(amp1,max(amp)/4); amp2=min(amp2,max(amp)/8); x1=0; x2=0; for n=1:length(zcr) goto=0; switch status case {0,1} if amp(n)>amp1 x1=max(n-count-1,1); status=2; silence=0; count=count+1; elseif amp(n)>amp2 | zcr(n)>zcr2 status=1; count=count+1; else status=0; count=0; end case 2, if amp(n)>amp2 | zcr(n)>zcr2 count=count+1; else silence=silence+1; if silence<maxsilence count =count+1; else if count<minlen status=0; silence=0; count=0; else status=3; end end end case 3, break; end end count=count-silence/2; x2=x1+count-1; subplot(3,1,1) plot(x) axis([1,length(x) -1 1]) ylabel('speech'); line([x1*frameinc x1*frameinc],[-1,1],'color','red'); line([x2*frameinc x2*frameinc],[-1,1],'color','red'); subplot(3,1,2) plot(amp); axis([1 length(amp) 0 max(amp)]) ylabel('energy'); line([x1 x1],[min(amp),max(amp)],'color','red'); line([x2 x2],[min(amp),max(amp)],'color','red'); subplot(3,1,3) plot(zcr) axis([1 length(zcr) 0 max(zcr)]) ylabel('zcr'); line([x1 x1],[min(zcr),max(zcr)],'color','red'); line([x2 x2],[min(zcr),max(zcr)],'color','red');