zizhenyuan_shu=101;fs=40000;
Data_path='D:\bsdata\shuiping\80zheng\1.';
i=96;
data_i=rename(i);
filename=strcat(Data_path,data_i);

[hp,hvx,hvy]=xindao2(filename,fs);
hp1=hp;
length0=size(hp1,2);
for n1=1:length0;
    if hp1(1,n1)~=0,break,end
end
length1=4000-(length0-n1+1);
if length1>0;
    hp1=[hp1,zeros(1,length1)];
end            %n1后的數不足3999個，就補零
hp1=hp1(:,[n1:(n1+3999)]);
% hp1=hp1(:,[n1:length1]);
figure(1);
subplot(211)
plot((0:3999)*1000/fs,hp1);
xlabel('time(ms)')
ylabel('幅度')

fft_p1=fft(hp1);
subplot(212);
plot((0:length(fft_p1)-1)/length(fft_p1)*fs,abs(fft_p1));
xlabel('f/Hz');
ylabel('|H(f)|');



Data_path='D:\bsdata\shuiping\psbianhua\58.'
for j=1;
    data_j=rename(j);
    filename=strcat(Data_path,data_j);

    [hp,hvx,hvy]=xindao2(filename,fs);
    hp2=hp;
    length2=size(hp2,2);
    for n2=1:length2;
        if hp2(1,n2)~=0,break,end;
    end
    length3=4000-(length2-n2+1);
    if length3>0;
        hp2=[hp2,zeros(1,length3)];
    end            %n1后的數不足3999個，就補零

    hp2=hp2(:,[n2:(n2+3999)]);
    %     hp2=hp2(:,[n2:length2]);
    figure(2);
    subplot(211)
    plot(hp2);

    %信道二圖
    fft_p2=fft(hp2);
    subplot(212);
    plot((0:length(fft_p2)-1)/length(fft_p2)*fs,abs(fft_p2));
    xlabel('f/Hz');
    ylabel('|H(f)|');
end

% figure(3)
% plot(abs(xcorr(hp1,hp2,'coeff')));
%     if size(hp2,2)>size(hp1,2);
%         M=size(hp2,2)-size(hp1,2);
%         b(j)=max(abs(xcorr([hp1,zeros(1,M)],hp2,'coeff')));
%         figure(3)
%         plot(abs(xcorr([hp1 ,zeros(1,M)],hp2,'coeff')));
%     else size(hp2,2)<size(hp1,2);
%         M=size(hp1,2)-size(hp2,2);
%         b(j)=max(abs(xcorr(hp1,[hp2,zeros(1,M)],'coeff')));
%         figure(3);
%         plot(abs(xcorr(hp1,[hp2,zeros(1,M)],'coeff')));
%     end
% end