notch filter

[gulm]

Hi, I need help about to build a notch filter ptbypt to filter 50 HZ How is possible, there is an example?
I tried but unlukely.
I need to filter an ecg signal. Thank' elisa

[Manji75]

Hi, I found some links dealing with notch filters and one of them contains an example I hope will be useful for you:

1) http://sine.ni.com/apps/we/niepd_web_display.display_epd4?p_guid=B45EACE3E29556A4E034080020E74861&p_node=DZ52000_US

2) http://exchange.ni.com/servlet/ProcessRequest?RHIVEID=101&RNAME=ViewQuestion&HOID=506500000008000000556A0000&ECategory=LabVIEW.LabVIEW+General

3) http://exchange.ni.com/servlet/ProcessRequest?RHIVEID=101&RNAME=ViewQuestion&HOID=5065000000080000007D970000&ECategory=LabVIEW.LabVIEW+General

Bye!

[marp84]

the notch filter as same as badstop filter. then i try to design the bandstop filter but i dont understand what is frequency cut-off (lower-higher) and may be can you tell me how to design this more details.cause i use this filter with my ecg design. 

tanx before