diff --git "a/\345\210\230\346\237\257\347\277\224-20202320-\347\275\221\347\273\234\347\274\226\347\250\213\345\256\236\351\252\214\350\257\276" "b/\345\210\230\346\237\257\347\277\224-20202320-\347\275\221\347\273\234\347\274\226\347\250\213\345\256\236\351\252\214\350\257\276"
new file mode 100644
index 0000000000000000000000000000000000000000..1fe2e4f625a17afc9f954acd2a164ad3747312da
--- /dev/null
+++ "b/\345\210\230\346\237\257\347\277\224-20202320-\347\275\221\347\273\234\347\274\226\347\250\213\345\256\236\351\252\214\350\257\276"
@@ -0,0 +1,84 @@
+clc
+clear
+Fs = 6554;                    % Sampling frequency
+T = 1/Fs;                     % Sample time
+L = 20480;                     % Length of signal
+t = (0:L-1)*T;                % Time vector
+y1=randn(size(t));
+figure(1)
+subplot(2,1,1);
+
+plot(t,y1)
+title('高斯序列')
+d = randn(1,50);
+y2=[y1(51:20480) d];
+subplot(2,1,2);
+plot(t,y2)
+title('高斯序列')
+Wp = [300 400]/Fs*2;
+Rp = 5;
+Rs = 40;
+[s,w,v]=cheby2(Rp,Rs,Wp,'bandpass');   %使用规范对象的切比雪夫II型滤波器
+[sos,g]=zp2sos(s,w,v);   %将零极点增益滤波器参数转换为二阶截面形式
+hd=dfilt.df2tsos(sos,g);  %离散时间，SOS直接形式II转置滤波器
+x1= filter(hd,y1) ;
+x2= filter(hd,y2) ;
+% x1 = awgn(x1,-2);
+% x2 = awgn(x2,-2);
+zs = wgn(1,L,-2);
+Wp1 = [800 1500]/Fs*2;
+[s,w,v]=cheby2(Rp,Rs,Wp1,'bandpass');   %使用规范对象的切比雪夫II型滤波器
+[sos,g]=zp2sos(s,w,v);   %将零极点增益滤波器参数转换为二阶截面形式
+hd=dfilt.df2tsos(sos,g);  %离散时间，SOS直接形式II转置滤波器
+zs = filter(hd,zs) ;
+
+figure(2)
+subplot(2,1,1);
+
+plot(t,x1)
+title('滤波后的x1')
+subplot(2,1,2);
+plot(t,x2)
+title('滤波后的x2')
+figure(3)
+NFFT = 2^nextpow2(L); % Next power of 2 from length of y
+Y = fft(x1,NFFT)/L;
+f = Fs/2*linspace(0,1,NFFT/2+1);
+% Plot single-sided amplitude spectrum.
+subplot(2,1,1);
+plot(f,2*abs(Y(1:NFFT/2+1))) 
+title('x1的频谱')
+xlabel('频率 (Hz)')
+ylabel('|Y(f)|')
+Y = fft(x2,NFFT)/L;
+f = Fs/2*linspace(0,1,NFFT/2+1);
+% Plot single-sided amplitude spectrum.
+subplot(2,1,2);
+plot(f,2*abs(Y(1:NFFT/2+1))) 
+title('x2的频谱')
+xlabel('频率 (Hz)')
+ylabel('|Y(f)|')
+x1 = x1+zs;
+x2 = x2+zs;
+figure(4)
+NFFT = 2^nextpow2(L); % Next power of 2 from length of y
+Y = fft(x1,NFFT)/L;
+f = Fs/2*linspace(0,1,NFFT/2+1);
+% Plot single-sided amplitude spectrum.
+subplot(2,1,1);
+plot(f,2*abs(Y(1:NFFT/2+1))) 
+title('加噪x1的频谱')
+xlabel('频率 (Hz)')
+ylabel('|Y(f)|')
+Y = fft(x2,NFFT)/L;
+f = Fs/2*linspace(0,1,NFFT/2+1);
+% Plot single-sided amplitude spectrum.
+subplot(2,1,2);
+plot(f,2*abs(Y(1:NFFT/2+1))) 
+title('加噪x2的频谱')
+xlabel('频率 (Hz)')
+ylabel('|Y(f)|')
+[A B] = xcorr(x1,x2,'biased');
+figure(5)
+plot(B*T,A)
+title('互相关系数')
\ No newline at end of file
diff --git "a/\351\202\223\351\223\204-20202308-\347\275\221\347\273\234\347\274\226\347\250\213\345\256\236\351\252\214\350\257\276" "b/\351\202\223\351\223\204-20202308-\347\275\221\347\273\234\347\274\226\347\250\213\345\256\236\351\252\214\350\257\276"
new file mode 100644
index 0000000000000000000000000000000000000000..4499c0b5e97f43cd3972c661d09f3c9152541ffe
--- /dev/null
+++ "b/\351\202\223\351\223\204-20202308-\347\275\221\347\273\234\347\274\226\347\250\213\345\256\236\351\252\214\350\257\276"
@@ -0,0 +1 @@
+随便写点东西吧
\ No newline at end of file