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*To*: AUDITORY@xxxxxxxxxxxxxxx*Subject*: Re: equal loudness calculation*From*: Jose-Javier Lopez <jjlopez@xxxxxxxxxxx>*Date*: Mon, 18 Apr 2005 12:54:18 +0200*Delivery-date*: Mon Apr 18 06:57:46 2005*References*: <f06200720be8189f1a41f@[134.100.43.234]> <001d01c543f2$07902140$33212a9e@Neutrino> <f06200731be8939a9f49f@[194.95.161.215]>*Reply-to*: Jose-Javier Lopez <jjlopez@xxxxxxxxxxx>*Sender*: AUDITORY Research in Auditory Perception <AUDITORY@xxxxxxxxxxxxxxx>

in this case, I don't want to filter a sound, but simply scale its amplitude. Or is there a way to make the formula itself efficient by implementing it as a filter?

If you have your data in freq domain, just use the equation for weighting. In this case you don't need to filter in time domain.

JJ

----- Original Message ----- From: "Julian Rohrhuber" <rohrhuber@xxxxxxxxxxxxxx> To: <AUDITORY@xxxxxxxxxxxxxxx> Sent: Monday, April 18, 2005 12:18 PM Subject: Re: [AUDITORY] equal loudness calculation

>This is the analitic equation for A-Weighting.

http://www.beis.de/Elektronik/AudioMeasure/WeightingFilters.html#A-Weighting

thank you, this is quite exactly what I was looking for.

Just, pass it to Z domain and use "a" and "b" coef. in a IIR filter.

in this case, I don't want to filter a sound, but simply scale its amplitude. Or is there a way to make the formula itself efficient by implementing it as a filter?

Very efficient !

JJ

----- Original Message ----- From: "Julian Rohrhuber" <rohrhuber@xxxxxxxxxxxxxx> To: <AUDITORY@xxxxxxxxxxxxxxx> Sent: Tuesday, April 12, 2005 4:25 PM Subject: [AUDITORY] equal loudness calculation

I'm looking for a computationally efficient way to do a frequency dependent amplitude compensation. The emphasis is much less accuracy (especially not for different loudness levels) but more a reasonable approximation - maybe a polynomial.

Any hints?

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**Follow-Ups**:**Re: equal loudness calculation***From:*Julian Rohrhuber

**References**:**equal loudness calculation***From:*Julian Rohrhuber

**Re: equal loudness calculation***From:*Jose-Javier Lopez

**Re: equal loudness calculation***From:*Julian Rohrhuber

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