1、主程序：%fs=22050; %抽样频率x=wavread(2.wav);figure(1);subplot(211);plot(x);title(原始语音信号波形,fontsize,16,fontweight,bold);xlabel(样点数,fontsize,16,fontweight,bold);ylabel(幅值,fontsize,16,fontweight,bold);grid on;N=128;n=0:N-1;y=fft(x);mag=abs(y);f=(0:length(y)-1)*fs/length(y);%进行对应的频率转换figure(1);subplot(212);plo
2、t(f,mag);title(原始信号频谱图,fontsize,16,fontweight,bold);xlabel(频率（Hz）,fontsize,16,fontweight,bold);ylabel(幅值,fontsize,16,fontweight,bold);grid on;y=wavread(2.wav);%预加重figure();subplot(211);plot(x);xlabel(样点数,fontsize,16,fontweight,bold);ylabel(原始波形(幅值),fontsize,16,fontweight,bold);xx=double(y);subplot(2
3、12);plot(xx);xlabel(样点数,fontsize,16,fontweight,bold);ylabel(预加重波形（幅值）,fontsize,16,fontweight,bold);%对指定帧位置进行加窗处理Q=y;N=256;%窗长Hamm=hamming(N);%加窗（汉明窗）Rect=rectwin(N);%加窗（矩形窗）frame=60;%需要处理的帧位置M=Q(frame-1)*(N/2)+1):(frame-1)*(N/2)+N);Frame=M.*Hamm;%加窗后的语音帧frame=M.*Rect;figure();subplot(211);plot(Frame
4、);ylabel(汉明窗,fontsize,16,fontweight,bold);subplot(212);plot(frame);ylabel(矩形窗,fontsize,16,fontweight,bold);%语音信号分帧figure();subplot(211);plot(y);xlabel(样点数,fontsize,16,fontweight,bold);ylabel(原始,fontsize,16,fontweight,bold);y=enframe(y,256,80);subplot(212);plot(y);xlabel(帧数,fontsize,16,fontweight,bol
5、d);ylabel(分帧,fontsize,16,fontweight,bold);%端点检测x1,x2=vad(x);%调用函数vad实现%浊音， 取13270-13510个点%短时自相关函数temp=y(13271:13510);Rn1=zeros(1,240);for nn=1:240 for ii=1:240-nn Rn1(nn)=Rn1(nn)+temp(ii)*temp(nn+ii); endendfigure(6);subplot(211);jj=1:240;plot(jj,Rn1,b);title(浊音自相关函数,fontsize,16,fontweight,bold);xla
6、bel(帧数,fontsize,16,fontweight,bold);ylabel(短时自相关函数,fontsize,16,fontweight,bold);grid on;%清音， 取12120-12360个点%短时自相关函数temp=y(12121:12360);Rn2=zeros(1,240);for nn=1:240 for ii=1:240-nn Rn2(nn)=Rn2(nn)+temp(ii)*temp(nn+ii); endendfigure(6);subplot(212);jj=1:240;plot(jj,Rn2,b);title(清音自相关函数,fontsize,16,fo
7、ntweight,bold);xlabel(帧数,fontsize,16,fontweight,bold);ylabel(短时自相关函数,fontsize,16,fontweight,bold);grid on;分帧功能子程序：function f=enframe(x,win,inc) % F = ENFRAME(X,LEN) splits the vector X(:) up into % frames. Each frame is of length LEN and occupies % one row of the output matrix. The last few frames o
8、f X % will be ignored if its length is not divisible by LEN. % It is an error if X is shorter than LEN. nx=length(x(:); nwin=length(win); if (nwin = 1) len = win; else len = nwin; end if (nargin 1) w = win(:); f = f .* w(ones(nf,1),:); End选端点功能子程序：function x1,x2 = vad(x)% x=audioread(1.wav);%幅度归一化到-
9、1,1x = double(x);x = x / max(abs(x);%常数设置FrameLen = 240;FrameInc = 80;amp1 = 10;amp2 = 2;zcr1 = 10;zcr2 = 5;maxsilence = 8; % 6*10ms = 30msminlen = 15; % 15*10ms = 150msstatus = 0;count = 0;silence = 0;%计算过零率tmp1 = enframe(x(1:end-1), FrameLen, FrameInc);tmp2 = enframe(x(2:end) , FrameLen, FrameInc)
10、;signs = (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, FrameInc), 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x1 = 0; x2 = 0;for n=1:length(zcr) goto = 0; switch status case 0,1 % 0 = 静音, 1 = 可能开始 if amp(n)
11、amp1 % 确信进入语音段 x1 = max(n-count-1,1); status = 2; silence = 0; count = count + 1; elseif amp(n) amp2 | . % 可能处于语音段 zcr(n) zcr2 status = 1; count = count + 1; else % 静音状态 status = 0; count = 0; end case 2, % 2 = 语音段 if amp(n) amp2 | . % 保持在语音段 zcr(n) zcr2 count = count + 1; else % 语音将结束 silence = sil
12、ence+1; if silence maxsilence % 静音还不够长，尚未结束 count = count + 1; elseif count minlen % 语音长度太短，认为是噪声 status = 0; silence = 0; count = 0; else % 语音结束 status = 3; end end case 3, break; endend count = count-silence/2;x2 = x1 + count -1;figure();subplot(311)plot(x)axis(1 length(x) -1 1)ylabel(Speech);line
13、(x1*FrameInc x1*FrameInc, -1 1, Color, red);line(x2*FrameInc x2*FrameInc, -1 1, Color, red);subplot(312)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(313)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);
