加速度信号怎样做带通滤波

土豆丝

是这样的，我分析了采集的加速度信号，fft变换，看到的特征频率不明显；我想通过滤波处理去掉不需要的成分而让我的特征频率凸显出来！我所测得信号是噪声信号，其特征频率在3k-4kHz之间。求大神帮忙改改程序！万分感谢！
时域频域处理程序.txt (707 Bytes, 下载次数: 13)

2013-9-23 00:06 上传

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土豆丝

上传m文件时提示不能上传此类文件，所以把程序复制到txt里面上传的。麻烦各位高手帮忙看看，不胜感激！！！

raytheon

楼主问题解决没，小弟也遇到同样的问题，能共享下么

zhanzhuoyu

我也遇到了这种问题。

marine2007

你的信号的文件也发上来吧

醉忘寒砂

同问

TestGuru

既然都通过FFT到频域了，看频谱不需再滤波吧，除非还要回到时域看波形

醉忘寒砂

信号不用先预处理下吗，去除趋势项什么的

红轮

clear
Fs=2e4;   % 4K信号，少说的20K Fs吧
A=rand(1,100000); % 将A替换成原始信号
A=A-mean(A);

Num=[0.00161112226381627,-0.000802557086115521,0.00104164258000612,0.00220488455361138,-0.000339129469996929,-0.00583727329637573,-0.00703830581513170,0.00144342287326455,0.0124181301095151,0.0109864063580785,-0.00579153420188363,-0.0201378813916786,-0.0129338148953489,0.0101240504889649,0.0223843772741141,0.00958564072841634,-0.0111968269103885,-0.0150163664062950,-0.00313056206057449,0.00219575978761133,-0.00476811126912141,-0.00231527292530494,0.0202956368426141,0.0327801618043457,-2.81865723570261e-05,-0.0553080345164984,-0.0606321052182241,0.0136366603088961,0.0943818908474909,0.0777895315109752,-0.0369058726383309,-0.125459300158704,-0.0779888326936309,0.0617614861305041,0.137240963654865,0.0617614861305041,-0.0779888326936309,-0.125459300158704,-0.0369058726383309,0.0777895315109752,0.0943818908474909,0.0136366603088961,-0.0606321052182241,-0.0553080345164984,-2.81865723570261e-05,0.0327801618043457,0.0202956368426141,-0.00231527292530494,-0.00476811126912141,0.00219575978761133,-0.00313056206057449,-0.0150163664062950,-0.0111968269103885,0.00958564072841634,0.0223843772741141,0.0101240504889649,-0.0129338148953489,-0.0201378813916786,-0.00579153420188363,0.0109864063580785,0.0124181301095151,0.00144342287326455,-0.00703830581513170,-0.00583727329637573,-0.000339129469996929,0.00220488455361138,0.00104164258000612,-0.000802557086115521,0.00161112226381627];
fil_A = filter(Num,1,A); % 3000-4000带通

Pseudo-lover

哪位高人来指导一下