Talk:Cutoff frequency

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Hi, sorry for any confusion - I originally proposed a deletion of the cutoff wavelength article because there isn't any point in having an article about cutoff frequency and cutoff wavelength. Then I read this article, and it is somewhat incomplete - it doesn't include anything specifically about waveguides such as the optical waveguides mentioned in the other article. I'll start adding to this article soon, and hopefully incorporate the info in the cutoff wavelength stub. Thanks --Bmk 05:41, 13 July 2006 (UTC)

The lowest TM cutoff frequency for for a rectangular waveguide should be n=1,m=1 not (0,1). If either n or m is 0 then the electric field will equal 0, since Ez (x,y) = E0 sin (n*Pi*x/a) sin (m*Pi*y/b).

--Pozarnik (talk) 07:09, 19 November 2007 (UTC)

Article is not written in everyday terms[edit]

I don't understand this article at all. It doesn’t seem very clearly explained in everyday terms, and relies on knowledge of other terms and concpets which I don’t think most people would understand.

I would suggest that a more dumbed-down explanation is used in the introduction, before getting more technical later on. I’d write a clearer explanation myself, but unfortunately I don’t have a clue what “cutoff” means. (Well, actually, I thought I did know what cutoff meant before I read this article, but this article doesn’t seem to support my definition of cutoff. Or maybe it does and I just can’t understand it?)

Grand Dizzy (talk) 18:46, 4 October 2008 (UTC)

I agree the lead was a mess; see if my attempt to clarify helps. Bring more suggestions if this doesn't do it. Dicklyon (talk) 20:11, 4 October 2008 (UTC)
Tagged for technical detail. Also would like to merge/supersede Half power point with this article. ChrstphrChvz (talkcontribs) 06:04, 13 November 2014 (UTC)


This seems to be mentioning alot about electronics, but nothing about the use if cutoff, bandpass, highpass, or lowpass, as in synthesizers for music. I think this article needs to list more things that use said filters, instead of just the very broad "electronics". G man yo (talk) 09:19, 29 October 2008 (UTC)

Good suggestion. Why not write a text that refers to articles such as high frequency limit, subtractive synthesis, voltage-controlled filter VCF (which i.m.o. should be extended to also cover Digitally Controlled Filters DCF), Parametric equalization, Wah-wah (music), Audio crossovers for loudspeakers, etc. Or put it in the low-pass filter and band-pass filter articles. Mange01 (talk) 00:18, 30 October 2008 (UTC)

I could try, but I dont know what half of that stuff means, I just thought it might be a good idea :P. I could research in some of my spare time, though.G man yo (talk) 09:47, 3 November 2008 (UTC)

Don't you mean "j is the imaginary unit"?[edit]

In Single-pole transfer function example, where article reads: "...and i is the imaginary unit", don't you mean "...and j is the imaginary unit", since the equations are using j not i? (talk) 06:37, 29 September 2013 (UTC)

Crossover frequency[edit]

crossover frequency redirects here, this is very wrong and confusing82.168.65.130 (talk) 17:41, 29 October 2013 (UTC)

Agreed, this article is not a very good target for crossover frequency. I have retargeted it to audio crossover. SpinningSpark 19:10, 30 October 2013 (UTC)

Unclear Diagrams[edit]

Neither of the two diagrams at the top of the page clearly demonstrate cutoff frequency in general terms - both refer specifically to filters, and are not ambiguous enough to show the cutoff for an amplifier, for example, where cutoff is defined as the point where the graph intersects with unity gain. — Preceding unsigned comment added by (talk) 02:19, 4 January 2015 (UTC)

Do you have a diagram you would like to offer? I think the existing diagrams are fine as examples of cutoff frequency. A specific example often makes a concept easier to grasp. As for amplifier cutoff being defined as unity gain, the article does not even discuss this so having a diagram would be a bit odd. Besides, I don't believe that it is an engineeringly useful concept, it is more of a device used by manufaturer's spec sheet writers that enable them to quote a larger bandwidth than they otherwise could. SpinningSpark 10:07, 4 January 2015 (UTC)