I'm looking for a A-weighting filter implemented in matlab. I found one on www.replaygain.org but it doesn't work. And I can't seem to find it on google, so does anyone have a A-weighting filter implemented in matlab?

There's no need to implement it. It's already built-in.
>> help filter

You've to feed it with the impulseresponse (for FIR filters) or the A/B coefficient sets and it works.

Instead of applying the filter in the time domain, you could also do a windowed FFT and accumulate the weighted squares of the FFT bins to get a picture of "how loud" it is perceived.

Dunno which method is faster. I guess there's no big performance difference.


bye,
Sebastian