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147 Views 5 Replies Latest reply: Mar 19, 2012 3:51 AM by Akeron RSS
Akeron Just Startin'
Akeron
224 posts since
Jul 23, 2011
Currently Being Moderated

Mar 18, 2012 8:16 AM

EQ Conversion

In

 

http://line6.com/support/message/227472

 

forum member "alpernar" reported his conversion of the frequencies of the Parametric EQ from percentages to Hertz. I haven't fully understood how he did it but from what I could guess that must be a relative simple process once you grasp the concepts. How come that no one else, in one year, has completed that process, giving exact matches (1%, 2% and so on) for all the EQs? I don't know how to do it otherwise I would do that myself...

  • meambobbo Iknowathingortwo
    meambobbo
    1,702 posts since
    Dec 13, 2007
    Currently Being Moderated
    Mar 18, 2012 6:23 PM (in response to Akeron)
    Re: EQ Conversion

    hopefully they're working on displaying the values in HZ.

     

    if you want a translation for all the values individually, download voxengo span:

    http://www.voxengo.com/product/span/

    or some other spectrum analyzer software.

     

    get an audio clip of pink noise.  put it on an mp3 player.

     

    connect the mp3 player up to your pod by means of the 1/8" aux in connection.

     

    Set up a patch on the pod with input 1: Aux, and nothing in it but a Parametric EQ (or other EQ you want to test).

     

    set the gain on the EQ fairly high, so there's a noticeable difference when you turn it on/off.

     

    record a clip of the noise looped, and as it plays, toggle the EQ on, off, turn the frequency up 1% and repeat.  do so for all 101 possible values.

     

    Watch the playback and write down each frequency highlighted in the frequency analysis software.

     

    Thanks and let us know what you find.

    • Akeron Just Startin'
      Akeron
      224 posts since
      Jul 23, 2011
      Currently Being Moderated
      Mar 18, 2012 7:29 PM (in response to meambobbo)
      Re: EQ Conversion

      Thanks meambobbo I will do that and then post the results.

      • jimsreynolds Power User
        jimsreynolds
        2,227 posts since
        Jun 27, 43450
        Currently Being Moderated
        Mar 19, 2012 1:10 AM (in response to Akeron)
        Re: EQ Conversion

        Failing that:  I took Alpernar's data in from the linked thread and plotted it.  Makes a lovely curve.  If anyone is a dab hand at calculus they could work out the intermediate values without the eighty additional samples.


        Sadly, I aint a dab hand at calculus !!

         

        Untitled.gif

      • jimsreynolds Power User
        jimsreynolds
        2,227 posts since
        Jun 27, 43450
        Currently Being Moderated
        Mar 19, 2012 2:06 AM (in response to Akeron)
        Re: EQ Conversion

        Actually, my wife (who is doing a maths degree) says I am talking rubbish and that you cannot use calculus here ... apparently you would need to know the original function.  Que sera.   I played around around with a few functions but cannot really get a close enough map onto the existing data.

         

        My wife tells me 'stop making life difficult and read it off the graph, stupid'.  Not convinced !

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