8da10707   
   XPost: rec.audio.pro, comp.dsp   
   From: spope33@speedymail.org   
      
   Chris Bore   wrote:   
      
   >Having written at length, I reluctantly consulted Wikipedia and to my   
   >amazement found it contained useful information.   
   >   
   >http://en.wikipedia.org/wiki/DBFS   
   >   
   >It does refer to the ambiguity, and in fact refers to an AES standard   
   >(0 dBFS is rms of a full scale sine wave) and to a practial standard   
   >(Euphonix sound level meters) that has 0 dBFS as the rms of a full   
   >scale square wave (equivalent to the 'instantaneous' definition that I   
   >suggested).   
      
   I find the former of these two definitions more widely used than the   
   latter.   Any signal whose RMS value is the same as that of a full-scale   
   non-clipping sine wave is 0 dBFS.  So a clipping square wave is   
   +3 dBFS.   
      
   Steve   
      
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