XPost: rec.audio.pro, comp.dsp   
   From: walkinay@nv.net   
      
   Randy Yates  wrote:   
      
   > kludge@panix.com (Scott Dorsey) writes:   
   >   
   > > In article , Randy Yates   wrote:   
   > >>   
   > >>If dBFS is defined as   
   > >>   
   > >>  dBFS = 20 * log_10(XRMS / (RMS value of full-scale sine wave),   
   > >>   
   > >>where XRMS is the RMS value of the digital data stream, and you're   
   > >>generating a "digital square wave," then you are wrong. The digital   
   > >>square wave can go to +3dBFS as defined above.   
   > >   
   > > dBFS has not got a damn thing to do with sine waves or reference levels   
   > > or anything in the analogue world.   
   >   
   > Again, I'm not asking how it's not defined, I'm asking how it is   
   > defined.   
   >   
   > You guys have danced around this one all day. It's getting humorous.   
   >   
   > > It has ONLY to do with how far a digital level is below the point at   
   > > which the digital value reaches full scale (all bits on).   
   >   
   > If you know what it means, and you're literate, then you should be able   
   > to come up with a precise definition. I haven't seen one yet.   
      
   You have, but you aren't recognizing it, because it is not what you   
   expected it to be, Randy.   
      
   My Metric Halo converter has a wide range of available input   
   sensitivities. Set it to -10 and it can reach 0 dBFS. Set it to +4 and   
   it can reach 0 dBFS. For each of those conditions we can relate an   
   incoming analog signal level to a specific number of bits. Here's the   
   rub: in either case we can get 0 dBFS. In each case the corresponding   
   analog input level is quite different.   
      
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