Talk:Electronic filter

message: filter (signal processing) redirects here, but I think it should be an article on its own.  Digital filters aren't really "electronic". — Omegatron 01:07, 6 December 2005 (UTC)
thread_title:  filter in general 

message: The page mentions some other filters as well, like the atomic filter, which is definitely not an electronic filter. Perhaps Filter (signal processing) should not be a redirect to this page?
I want to link to an article about filters in general (see the last paragraph of Spectral splatter) but there's only this page. The reference to filters in Spectral splatter applies both to Audio filters and Electronic filters, and any other generic signal processing filter.
I think Filter (signal processing) should exist. Romanski 19:42, 14 June 2006 (UTC)
replies: text: I took the liberty of editing spectral splatter to link to linear filter -- is that closer to what you wanted? Should filter (signal processing) also link to linear filter ? --75.19.73.101 (talk) 08:17, 15 December 2007 (UTC)

text: Today I find the stub analogue filter. Should we move information about filters that are technically not "electronic" from "electronic filter" to "analogue filter"? --75.19.73.101 (talk) 20:03, 16 December 2007 (UTC)
thread_title:  Not only electronic filters at the moment 

message: Single and multipole are implied by the structure to be types of passive filters.
There is no discussion what a pole is (which may not belong here. Perhaps a mention that it is a measure,in one sense, of how complex the filter is?). It seems to imply that (R)LC circuits are single pole but the simplest ones are two pole.
  3ch Colonel hack 03:47, 17 June 2006 (UTC)
replies: text: yeah, complex analysis is exactly right.  Poles and zeroes are important for amplifier stability as well as filters.  Look at Nyquist stability criterion, that article pretty much explains what poles and zeroes are all about in terms of electronics. SpinningSpark 22:45, 19 April 2008 (UTC)
replies: text: I dare say Colonel hack is not around any more, but his comment is wrong, RC, RL, are single pole, LC and RLC circuits are all single two-pole and, T and Pi filters are 23-pole.  That is not so clear from the headings. In any case, it is a confusing classification.  Number of filtering elements is what I think the author was trying to say.  The LC circuit is a single filtering element in the context of band pass filter.SpinningSpark 22:51, 19 April 2008 (UTC)
thread_title:  Single pole types etc

message: The analog filter and digital filter pages give the impression that whether a filter is "analog" or "digital" has everything to do with the domain over which the signal is defined. In other words, the "analog" and "digital" filter pages read more like "continuous-time" and "discrete-time" filter pages. Despite its other weaknesses, electronic filter does a better job explaining the distinctions between all of these different adjectives. In particular, the first paragraph of electronic filter admits that there can be discrete-time analog signals; that's a major improvement over the analog filter and digital filter pages. Perhaps those pages can be merged into this page? Or perhaps separate continuous-time filter and discrete-time filter pages can be made? —TedPavlic (talk/contrib/@) 00:06, 4 July 2009 (UTC)
replies: text: Add some clarifying detail and those titles as redirects; the name digital filter is pretty conventional, so should probably stay as is.   Though there is no analog filter article now – it's a peculiar redirect, which might be worth sorting out. Dicklyon (talk) 06:54, 27 August 2009 (UTC)
thread_title:  Remove "analog filter" and "digital filter" pages 

message: :I don't understand a single thing of what you are saying, I'd just like to know how you merge the theoretical polynomials with the practical. This sounds stupid, I know, but still I'd like to see some more than theoretical assemblance.  —Preceding unsigned comment added by Knoppson (talk • contribs) 01:22, 27 August 2009 (UTC)
replies: text: There's got to be some more clearifying way to make use of the different polynomials. Can't somebody make an example? This is exciting!Knoppson (talk) 03:00, 27 August 2009 (UTC)
replies: text: K, I did some work on Bessel filter to try to give you a better clue what the polynomials are about; look at the pictures and the equations, follow the links, etc., and ask again if this isn't doing it for you.  And I'm unclear about why you added "sources" there; were those sources used in writing the article?  Are they accessible?  I found a good ref online and added that as a proper citation.  They way anyone can look, verify the info, and learn more about it. Dicklyon (talk) 06:53, 27 August 2009 (UTC)
thread_title: Polynomials

message: Almost all the discussions I have seen of filter designs have talked about filter response in the steady state. I believe from experience that in some circumstances it is necessary to include considerations of the filter transient response in the design. For instance, I had to create a 50 kHz bandpass filter to isolate a signal that had also been chopped at a low frequency, 30 Hz. My first bandpass design used a combination of low-pass and high-pass Butterworth filter sections. Despite a theoretically great low frequency attenuation, the low frequency chopping signal appeared clearly in the filter output. I had much greater success when the bandpass filter was redesigned using Bessel filter sections, despite the theoretically less low frequency attenuation. I attribute this result to the differences in the transient response of the filter types. While this may be an esoteric special case, it was a real problem. I have always wished since to see a discussion of filter design that could have provided useful guidance. 
--AJim (talk) 02:33, 8 September 2009 (UTC)
replies: text: ALL filter theory and most design assumes a perfectly linear response to any stimuli. In practise if your signal exceeds the linear range of your components you will have distortion. In your case, assuming the same components and signal strength, the Bessel filter may benefit you from having a linear phase passband. 178.15.145.204 (talk) 09:48, 22 March 2012 (UTC)
thread_title:  transient response 

message: A reference was just added to a single "hybrid" (combined LC) element filter. I have not read the reference. Whether this reference is kept or not is not my concern. My point is that this "muddies the waters" for newcomers, and that this is inevitable. I think, as a consequence, that the article should go a step further and introduce the distinction between theoretical circuit elements, as used in the article, and actual components. The article should explain that the "pure" theoretical elements discussed here can only be approximated in the real world; a complete model of a real-world element always contains all 3 theoretical types (R,L, and C). I think there must already be an article or articles showing elaborated models of real elements. The article could define or link to the ideas of the "inductance" and "capacitance" of a real resistor, for instance. The article could then explain how these "stray" or "parasitic" elements appear in models of real filters and how they affect the behavior of a filter, and the circumstances under which they can be ignored, and when the matter a great deal. It would help newcomers to understand what is meant by a description such as a "non-inductive" resistor, or a "low equivalent series resistance" capacitor, and when having such components might matter in a filter. The article could also explain the distinction between "lumped" and "distributed" elements. AJim (talk) 19:14, 15 November 2010 (UTC)
thread_title:  ideal elements 

message: Just wondering if anyone with relevant background could enlighten me on an off-topic. My question is : is it possible to approach the problem of wind turbulence, with regards to wind mills through "turbulence filtration" using the same approach as with electronic or audio filtration ?  —Preceding unsigned comment added by 193.157.194.209 (talk) 14:27, 22 December 2010 (UTC)
thread_title:  Silly question 

message: I do think the output filters in power supplies are important, however its not even talked about here! How are they designed (eg, types, frequency and current considerations like inductor core heat dissipation)? Charlieb000 (talk) 01:34, 21 June 2013 (UTC)
thread_title:  How does this relate to power supplies!? 

message: The page on Boucherot filters links to here but the topology (R and C in series to gnd) is not described on this page.
https://en.wikipedia.org/wiki/Boucherot_cell
Kenif (talk) 04:56, 16 March 2014 (UTC)
replies: text: Your characerisation of the Boucherot cell is incorrect.  The RC element is only half the cell, the LR element is the other half. SpinningSpark 00:30, 17 March 2014 (UTC)
replies: text: The Boucherot cell is the R and C; this cell is half the circuit.  So, yes, it would not make a lot of sense to have it analyzed in isolation in this article.  Probably linking here is OK though.  Dicklyon (talk) 02:44, 17 March 2014 (UTC)
thread_title:  Boucherot 

message: As a layman, I come across words that I am unfamiliar with on these articles, such as "Attenuation", that are not linked to their corresponding article. Would it be better to use the technical term and link it to the corresponding article or rephrase the sentence and use simpler words for ignorant, but enthusiastic newbies like myself? — Preceding unsigned comment added by 75.142.183.45 (talk • contribs) 26 jul 2015 01:37‎ (UTC)
:I have wikilinked attenuation in the article. Feel free to add links to other appropriate pages.  Technical terms should always be explained, either directly, with a link, or with a glossary.  I think attenuation is a simple enough term, it is only one word. SpinningSpark 01:32, 8 August 2015 (UTC)
thread_title:  Layman's Terms 

message: , the navigation established at Filter (signal processing)#Technologies clearly points lumped circuit filters to electronic filter and distributed element filter to its own separate article.  Delay line filters should also have their own article and these are pointed to (the as yet unwritten) transversal filter.  A lot of material has previously been moved off this page into separate articles. Do we really want to start expanding out this page again to other topics?  In my view, material on other methods of filter construction should be added to the top level filter page if they don't already have their own page. SpinningSpark 16:58, 8 September 2019 (UTC)
replies: text: I'm OK if we make this article be about lumped-element filters, but that's not what the title suggests.  Maybe there's a better descriptor for that class?  I mean, the problem is that as i started reading it, it seemed artificially limited to lumped circuits, but didn't really clearly say so or point to where the rest of the class could be read about.   It read, "Electronic filters are a type of signal processing filter in the form of electrical circuits consisting of discrete (lumped) electronic components. Such filters ..." in which the second sentence would apply just as well to the broader class, so the "consisting of discrete (lumped) electronic components" seemed out of place.  If you want to revert that and fix some other way, that's great. Dicklyon (talk) 22:03, 8 September 2019 (UTC)
replies: text:  Do you have a suggestion for a title?  And where should the current title redirect? I don't want to rename such a long standing title without at least some cursory discussion. Perhaps a better idea is just to explicitly clarify the scope in the lead or a hatnote. SpinningSpark 17:57, 9 September 2019 (UTC)

text:  By the way, there was already a hatnote clearly defining the scope before you started making changes.  I'll add a link to DEFs in the hatnote to make it completley explicit. SpinningSpark 15:25, 11 September 2019 (UTC)
replies: text: OK, thanks.  Sorry I missed that. Dicklyon (talk) 16:45, 11 September 2019 (UTC)
thread_title:  Distributed element filters added back in