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function [f, amplitude, pha]= transferfunction(fs, x, y)
%fs---sample frequency
%x---input array
%y---output array

if nargin < 2,
error ('input arguments are not enough.');
end

[row_x,column_x]=size(x);
[row_y,column_y]=size(y);

if row_x ~= row_y
    error ('the length of x and y must be same.');
end

NFFT=length(x);
Pxx=fft(x);
Pyy=fft(y);
%Syy = Pyy((1:floor(NFFT/2)+1)).*conj(Pyy(1:floor(NFFT/2)+1)); %yigao
Sxy = Pxx((1:floor(NFFT/2)+1)).*conj(Pyy(1:floor(NFFT/2)+1));  
Sxx = Pxx(1:floor(NFFT/2)+1).*conj(Pxx(1:floor(NFFT/2)+1));
Hxy = Sxy./Sxx;

%Gxx = 2*Sxx; %yigao
%Gyy = 2*Syy; %yigao
%Gxy = 2*Sxy; %yigao

%rr = (abs(Gxy).*abs(Gxy))./(Gxx.*Gyy);

f = fs/2*linspace(0,1,length(x)/2+1);
amplitude = 20*log10(abs(Hxy)); %·ùÖµ£¬·Ö±´
pha = phase(Hxy)*180/pi;  %Ïà룬¶È
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