Drexel dragonThe Math ForumDonate to the Math Forum

Search All of the Math Forum:

Views expressed in these public forums are not endorsed by Drexel University or The Math Forum.

Math Forum » Discussions » Software » comp.soft-sys.matlab

Topic: filter low pass gives me a faster data
Replies: 6   Last Post: Jul 11, 2014 6:06 AM

Advanced Search

Back to Topic List Back to Topic List Jump to Tree View Jump to Tree View   Messages: [ Previous | Next ]

Posts: 23
Registered: 5/4/14
filter low pass gives me a faster data
Posted: Jul 4, 2014 9:13 AM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

I'm using a SensorTag which contain 6 sensors. here i'm interessing just for KJ9's accelerometer( data sheet of Kionix KJ9's accelerometer (http://www.willow.co.uk/html/components/com_virtuemart/shop_image/product/OEM%20Component%20Level%20Accelerometers/pdfs/KXTJ9-1007%20Specifications%20Rev%204.pdf)

10hz is a sampling frequency, and i choose a 0.6 as a cut-off frequency (arbitrairy).

My goal is to analyze acceleration's data and isolate a gravity's acceleration. For this reason, i applied a butterworth filter (low and high). Normally i should applied just a low filter, but the problem that gives me a filter's data value > data before applied a filter. for example :

data before filtred :

data after filtred:

(sometimes data after filtred is faster than data before filtred) it is normal?

Thanks in advance for any suggestion

Point your RSS reader here for a feed of the latest messages in this topic.

[Privacy Policy] [Terms of Use]

© Drexel University 1994-2014. All Rights Reserved.
The Math Forum is a research and educational enterprise of the Drexel University School of Education.