Talk:State variable filter

Untitled
The first paragraph, at least, could be written in accessible English. This is an encyclopedia. People come here to understand in lay terms what something is. Please edit — Preceding unsigned comment added by 45.48.102.21 (talk • contribs) 24 January 2016 (UTC)

Confusing lead
I agree with the anonymous comment above. I will try to formulate a clearer and more relevant summary. Also I will hunt down some sources and add suitable references over the next week or two. DaveApter (talk) 11:03, 27 February 2020 (UTC)