Re: weighting filter

On 2008-05-19, dpierce.cartchunk.org@xxxxxxxxx
<dpierce.cartchunk.org@xxxxxxxxx> wrote:
On May 19, 2:45 pm, icecube <matlab....@xxxxxxxxxxxxxx> wrote:
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

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

Not as far as I can see. See, for example:

http://en.wikipedia.org/wiki/ITU-R_468_noise_weighting

The ITU-R standard BS.468-4 (not available for free, I think):

http://en.wikipedia.org/wiki/Standard:ITU-R_468

shows a fairly simple (600 Ohm impedance, two inductors, five capacitors)
weighting network and a more complex constant resistance weighting
network.

However these networks aren't reproduced in the URLs above although the
weights are, which may help the OP.

--
John Phillips
.

Relevant Pages

  • Re: weighting filter
    ...    http://en.wikipedia.org/wiki/ITU-R_468_noise_weighting ... The ITU-R standard BS.468-4 ... weighting network and a more complex constant resistance weighting ...
    (rec.audio.tech)
  • Re: weighting filter
    ... I believe ITU468-4 is the same as the old ANSI A weighting, ...     * Four differentiating zeros ... the ITU468-4 has more gain from 1 to 9kHz than the A weighting filter. ...
    (rec.audio.tech)