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). Bill On Dec 11, 2012, at 17:47, VE4PER/ Andy <ve4...@aim.com> wrote: > Noticed lengthy discussions on normalization and found this chart that > might be of interest > > > http://www.google.ca/url?sa=t&rct=j&q=0%20dbm&source=web&cd=4&sqi=2&ved=0CD4QFjAD&url=http%3A%2F%2Fwww.tecmag.com%2Fpdf%2Fdbm_v.pdf&ei=fN_HUK2TGIaE2gXlxoCgAQ&usg=AFQjCNEY25QxasGndqL5ZAXkYDCgFaB4KQ&cad=rja > > > also this explanation I found useful > > http://en.wikipedia.org/wiki/DBm > > Audacity shows a scale with 1.0 as a max usually but that is PEAK only > and is actually 2.0 VAC Peak to Peak > > RMS is 0.775 and average is closer to 0.5 so be sure to compare > apples to apples and oranges to oranges > > > I have a portable oscillator for aligning my mixer board and all other > audio sections including the PC's but only have a standard digital > multimeter and or a standard analog mutimeter neither of which are > calibrated to read in db, dbv or dbm unlike a lot of pro audio test sets > are so these relationships help to be able to use the basic meters to > calibrate my systems; but one has to be very aware of the relationships > and not to confuse, peak, peak-to-peak, average and RMS values in order > to maintain a maximum peak range between -8 dbm and -12 dbm and still > retain a further 4 db of additional headroom for protection. > > > > > > _______________________________________________ > Rivendell-dev mailing list > Rivendell-dev@lists.rivendellaudio.org > http://lists.rivendellaudio.org/mailman/listinfo/rivendell-dev _______________________________________________ Rivendell-dev mailing list Rivendell-dev@lists.rivendellaudio.org http://lists.rivendellaudio.org/mailman/listinfo/rivendell-dev
