Ah ah ah I was focused enough on the peak/rms values to not recognise pi!!!
Me stupid
Thank you... and sorry for the silly question
Stefano

>----Messaggio originale----
>Da: mskala@ansuz.sooke.bc.ca
>Data: 25/05/2015 15.28
>A: "csound users' discussions"
>Ogg: Re: [Csnd] brick wall limiter
>
>On Mon, 25 May 2015, vallste wrote:
>> Can someone explain the numbers in this formula?
>> I've found it quite useful but I'd like to know why use these specific
>> numbers.
>
>Arctangent is a trigonometric function that by its nature produces an
>angle in the range -pi/2 to +pi/2, where pi is the ratio between
>circumference and diameter of a circle.  Dividing by pi and multiplying by
>two gives a result in the range -1 to 1, which is convenient.  The number
>3.1415927 is a reasonable approximation of pi, whose true value is an
>irrational number.
>
>-- 
>Matthew Skala
>mskala@ansuz.sooke.bc.ca                 People before principles.
>http://ansuz.sooke.bc.ca/
>

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