- From: Daniel Nilsson <daniel_at_oden.homeip.net>
- Date: Thu, 3 Mar 2005 20:44:45 -0500
On Thu, Mar 03, 2005 at 09:36:42AM +0000, Bernd Porr wrote: > You can use the program > http://www.linux-usb-daq.co.uk/software2/comedi-record/ > to sample quite slowly. It internally always samples at 1kHz and then > averages on the fly to get a lower rate. It also has a 50Hz notch filter > (sorry, American colleagues). However, the filter frequency can be > changed in the program. I used it also with thermocouple sensors. Bernd, Thanks for the pointer, this is very close to exactly what I was looking for. From looking closer at your filter characteristics in the code I see that you are creating a pretty sharp notch filter. From the description above I take it that the purpose of this notch filter was to only take care of the 50Hz noise ? Is there a specific reason why you decide to do a notch filter instead of a low-pass filter in your application ? Is the notch filter applied before the averaging function ? Thanks -- Daniel Nilsson
Received on 2005-03-04Z01:44:45