On Sat, 2005-07-16 at 16:12 -0700, Bruce Ferrell wrote: > It's sometimes called comfort noise... As far as I'm aware, it's only > done in VoIP. > > I spent 15 years working with digital switches/T1 channel banks. I > guess it might have been built in and I just didn't know about it, but > we were very concerned about excess noise and quantization noise as it > was. We used to inject a 1004 test tone and then use a notch filter to > measure the amount of quantization noise at the reciever. >
I have seen it done at the switches that telcos use, not at the end user such as in a channel bank. -- Trixter http://www.0xdecafbad.com Bret McDanel UK +44 870 340 4605 Germany +49 801 777 555 3402 US +1 360 207 0479 or +1 516 687 5200 FreeWorldDialup: 635378
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