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A bandstop filter is the general case. A notch filter is a specific type of bandstop filter with a very narrow range. - Omegatron 21:36, July 23, 2005 (UTC)
it can be also implimented by using a low and a high pass filter such that low pass filter's cutoff frequency is slightly less than notch frequency and high pass filter's pass band begins at frequency slightly more than notch18.104.22.168 17:06, 5 December 2006 (UTC)suhas
I'd like to include these, perhaps someone with better wiki experience can make them look nice.
- I like these diagrams, but there are a number of issues with the whole page:
- these diagrams should be made consistent with the ones on low-pass filter, high-pass filter and band-pass filter pages.
- What's the assumed load on output?
- What's the Q value for this filter?
- The inductor's value is 1 H; is that a realistic, common value?
- The resistor's value is 10 kΩ; what would a low-impedance version of this circuit look like?
- Is there an RC-only notch filter?
- Some theory about the relation between the component values is warranted.
- How do I make a notch filter that has both a lower and upper cutoff?
- needs more links to reliable pages to satisfy the WP:OR police. Some links to filters here   .
- -- Waveguy (talk) 07:56, 18 February 2010 (UTC)
I would like to see this filter as both a first order Laplace- and Z-transform (H(s) = ... and H[z] = ...), as well as the resulting schematics and perhaps some frequency responses for the implementation. If someone happens to sit on such pictures/formulas, please write them down here. H(s) = (1-sqrt(a*b)s)^2 / (1 - as)(1 - bs), if I'm not mistaking. --22.214.171.124 (talk) 22:01, 19 October 2009 (UTC)