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ambelmm
[专家分：0] 发布于 2007-07-21 14:49:00
是一个巴特沃斯滤波程序,下面是部分数据
0 0 0 0 0 255 103 238 239 13
0 0 0 0 0 255 255 255 255 0
0 0 0 0 0 252 49 17 9 253
0 0 0 0 0 255 0 0 0 255
0 0 0 0 0 5 98 7 8 240
0 0 0 0 0 0 0 0 0 255
0 0 0 0 255 31 237 17 245 7
0 0 0 0 255 0 255 0 255 0
0 0 0 0 253 37 206 242 253 7
0 0 0 0 255 0 255 255 255 0
横着数从1到100
我编的滤波程序
clear all
fid=fopen('D:\学习\声学基础\衰减 成像实验数据\neck\sample_FB_00000.dat','r+');
shepindata=fread(fid,inf);
data=shepindata(1:100);
datah=reshape(data,10,10);
wn=[2*pi*4875000,2*pi*10125000];
[B,A]=butter(3,wn,'s');
data_f=filter(B,A,data);
datah_f=reshape(data_f,10,10)[/b]
结果
datah_f =
1.0e+305 *
Columns 1 through 8
0 0 0 0 0 -0.0000 0.0000 0.0000
0 0 0 0 0 -0.0000 -0.0000 -0.0000
0 0 0 0 0 0.0000 0.0000 -0.0000
0 0 0 0 0 0.0000 0.0000 0.0000
0 0 0 0 0 -0.0000 -0.0000 0.0000
0 0 0 0 0 0.0000 -0.0000 -0.0000
0 0 0 0 0 0.0000 0.0000 -0.0000
0 0 0 0 0 -0.0000 0.0000 0.0000
0 0 0 0 0 -0.0000 -0.0000 0.0000
0 0 0 0 0.0000 0.0000 -0.0000 -0.0000
Columns 9 through 10
0.0000 NaN
0.0000 NaN
-0.0000 NaN
-0.0000 NaN
0.0000 NaN
1.8489 NaN
-Inf NaN
NaN NaN
NaN NaN
NaN NaN
我们要求中心频率7.5MHZ,带宽70%
为什么后面会出现那么多无穷大呢 我遍的哪有问题啊
0 0 0 0 0 255 103 238 239 13
0 0 0 0 0 255 255 255 255 0
0 0 0 0 0 252 49 17 9 253
0 0 0 0 0 255 0 0 0 255
0 0 0 0 0 5 98 7 8 240
0 0 0 0 0 0 0 0 0 255
0 0 0 0 255 31 237 17 245 7
0 0 0 0 255 0 255 0 255 0
0 0 0 0 253 37 206 242 253 7
0 0 0 0 255 0 255 255 255 0
横着数从1到100
我编的滤波程序
clear all
fid=fopen('D:\学习\声学基础\衰减 成像实验数据\neck\sample_FB_00000.dat','r+');
shepindata=fread(fid,inf);
data=shepindata(1:100);
datah=reshape(data,10,10);
wn=[2*pi*4875000,2*pi*10125000];
[B,A]=butter(3,wn,'s');
data_f=filter(B,A,data);
datah_f=reshape(data_f,10,10)[/b]
结果
datah_f =
1.0e+305 *
Columns 1 through 8
0 0 0 0 0 -0.0000 0.0000 0.0000
0 0 0 0 0 -0.0000 -0.0000 -0.0000
0 0 0 0 0 0.0000 0.0000 -0.0000
0 0 0 0 0 0.0000 0.0000 0.0000
0 0 0 0 0 -0.0000 -0.0000 0.0000
0 0 0 0 0 0.0000 -0.0000 -0.0000
0 0 0 0 0 0.0000 0.0000 -0.0000
0 0 0 0 0 -0.0000 0.0000 0.0000
0 0 0 0 0 -0.0000 -0.0000 0.0000
0 0 0 0 0.0000 0.0000 -0.0000 -0.0000
Columns 9 through 10
0.0000 NaN
0.0000 NaN
-0.0000 NaN
-0.0000 NaN
0.0000 NaN
1.8489 NaN
-Inf NaN
NaN NaN
NaN NaN
NaN NaN
我们要求中心频率7.5MHZ,带宽70%
为什么后面会出现那么多无穷大呢 我遍的哪有问题啊
