----- Original Message ----- > From: "Bill Putney" <[email protected]>
> 1.0 in Audacity is 0 dBFS. This has nothing to do with voltage. It has > only a tenuous relationship to 0 dBVU. Various people use various > values for 0 dBVU. Usually it's -18 (EBU recommendation) or -20 (AES > recommendation) down from 0 dBFS. > > Now we kinda get to voltages. 0dBVU is +4 dBM (1.23V RMS at 600 ohms) > in pro systems. 0 dBVU is -10 dBV (.316V RMS). There is no such thing as "0dBVU". 0 VU is +4dBU at 1 kHz. https://en.wikipedia.org/wiki/VU_meter Note that the standard as mentioned there does not actually say what the sink impedance is, though in fact it's usually 600 ohms. Lots of "non-pro" gear interfaces with a 0 VU of, as you note, -10 dBV, which is, as you imply, *not* 14 dB lower, because the baselines are different - one is a power measurement which depends on the impedance; the other a voiltage measurement which does not. And digital gear tends to put 0 VU at -20dBFS -- at least, the gear I deal with. Alas, lots of people convert from digital back to analog, and do *not* adjust for that 20dB, with the annoying result that you can't effing hear anything. </nitpick> Cheers, -- jra -- Jay R. Ashworth Baylink [email protected] Designer The Things I Think RFC 2100 Ashworth & Associates http://baylink.pitas.com 2000 Land Rover DII St Petersburg FL USA #natog +1 727 647 1274 _______________________________________________ Rivendell-dev mailing list [email protected] http://lists.rivendellaudio.org/mailman/listinfo/rivendell-dev
