Re: weighting filter

On May 19, 2:45 pm, icecube <matlab....@xxxxxxxxxxxxxx> wrote:
HI

first off all i don't know if this is the correct forum for this type
of question

I'm trying to find away filter a signal with a weighting filter called
CCIR 468-4 (ITU-R 468-4)

and AES17

so what i'm looking for in the math behind the weighting type so i can
use them

if this isn't the correct forum can anbody direct me to the correct

rgds


I believe ITU468-4 is the same as the old ANSI A weighting,
in which case, from:

http://www.ptpart.co.uk/show.php?contentid=70#FrequencyWeightingFilterCharacteristics

A-weighting

The A-weighting characteristic is ideally realised by a filter with
the following characteristics:

* Four differentiating zeros
* Two poles at -20.6 Hz (-129.4 /s)
* One pole at -107.7 Hz (-676.7 /s)
* One pole at -737.9 Hz (-4636 /s)
* Two poles at -12200 Hz (-76655 /s)

and therefore has the following transfer function:

<see the link above>
.

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