d2c3046c   
   XPost: rec.audio.pro, comp.dsp   
   From: mrivers@d-and-d.com   
      
   On 11/21/2010 5:22 AM, davew wrote:   
      
   > This thread is about dBFS.   
      
   I don't think that it really is, though that's the only clue   
   we have from the header. Another clue was a screen shot of   
   some computer-generated bargraphs which were labeled "RMS."   
     I think that the troll is asking how it comes up with the   
   length of that bar. That's a legitimate question, but I   
   doubt that there's anyone here, with the possible exception   
   of Dick Pierce, who has ever been close enough to the design   
   of such a program to have an idea of what assumptions and   
   formula the programmer used.   
      
   Hence, the conclusion that, as an indicator of how loud the   
   audio sounds (relative to other chunks of audio, if you   
   don't adjust the volume control), it has some meaning. But   
   as a representation of a voltage, number of bits in use at a   
   particular time, or as an indication of how much headroom is   
   available, its value is only in the way that the user   
   interprets the bargraph reading and how it's changing over   
   time.   
      
   This is actually no different than the correct way to use a   
   VU meter.   
      
      
      
   --   
   "Today's production equipment is IT based and cannot be   
   operated without a passing knowledge of computing, although   
   it seems that it can be operated without a passing knowledge   
   of audio." - John Watkinson   
      
   http://mikeriversaudio.wordpress.com - useful and   
   interesting audio stuff   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)