Hello, John, (somewhat belated reply)

Yes; I think you are describing my usage. (We are talking about GEN13 in 
Music360, not GEN16 - the sone curve function.)

In sum: I am multiplying a p4-type amplitude by a table factor to get 
"perceived loudness" - the "simple" case that you describe.

Besides the obvious inaccuracy of the function table I've been using, there 
is the problem that the first entry in the table cannot be zero; so a raw 
amplitude of zero converts to some low value (about 10-15 in my case). 
Normally this level is inaudible; but still this bothers me.

If you construct such a GEN, I'd surely look forward to testing and using 
it.

Art Hunkins

----- Original Message ----- 
From: "jpff" 
To: 
Cc: 
Sent: Monday, December 08, 2008 9:12 AM
Subject: [Csnd] Re: Re: Re: low frequency oscilators


>I have been looking into GEN16/Music360 and I think it implemented the
> formula
>
> perceived amp = k (actual amp)^0/67
>
> Assuming you want the inverse of this then we have
>
> actual amp = (perceived amp) * ((perceived amp)/B)^(33/67)
> where B is the amplitude that is the dame (p4 of the GEN)
>
> Then if you and to hear X you look up in the table and get Y
>
> Does that sound plausible?  Easy to implement if so.
>  if not, tell be more about how you used this GEN
>
> ==John ffitch
>
>
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