how to implement a psophometric filter in Labview software

Hi Jake8,

I don't know about your situation, but my use for a psophometric filter

was to filter the audio before a sinad measurement. I didn't find a filter

algothym in the time domain, but I did find the filter shape in the

frequency domain. My SINAD meter calculates the SINAD from FFT data, so

the all i had to do was apply the filter shape over the FFT data, and so

filtering it, then calculate the SINAD.

It is possible to synthesise a FIR filter from frequency domain data, but

I couldn't make it work. The problem with FIR's, is they do take a lot of

processing compaired to IIR's for the same frequency responce.

If their is an engineer out there that can synthesise a suitable FIR or

IIR filter, I can forward the articles that have the freq responce.

Tim

Quote:

> I am trying to implement a psophometric filter in software for a noise

> measurment on a telephony system.