[linux-audio-dev] specs for 1/3 octave filters

Steve Harris S.W.Harris at ecs.soton.ac.uk
Thu Mar 3 09:34:17 EST 2005


Hi Fons,

I had a copy of the spec at one time, but I cant find it, I do still have
the formular for calculating the band centres though:

freq = 25 x 10^(band/10)
with band in [0,29]

I can probably find it again when I get back to work next week.

- Steve

On Thu, Mar 03, 2005 at 01:47:26 +0100, Alfons Adriaensen wrote:
> Hello,
> 
> I'm looking for the 'official' (ANSI/IEC/ITU/???) specs for the set of
> 1/3 octave bandpass filters used for sound analysis. ISTR there are
> different grades, depending on precision and filter order. If someone
> would have them (or a pointer) please drop me line.
> 
> 
> 
> TIA,
> 
> -- 
> Fons


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