XPost: rec.audio.pro, comp.dsp   
   From: MrT@home   
      
   "Randy Yates"  wrote in message   
   news:m38w0myt50.fsf@ieee.org...   
   > dbV is also another. However, both of these can be traced back to power   
   > with some assumptions.   
      
   Not assumptions, definitions, like a fixed impedance.   
      
   > Also, as has been pointed out, if these types   
   > of measurements were only voltage, why was the multiplier changed from   
   > 10 to 20?   
      
   Didn't you cover P=E*I and it's application to voltage given a fixed   
   impedance in your studies?   
   P=E^2/R and when using the log system for dB you multiply the 10*2 to get 20   
   (same for current since P=I^2R)   
      
   >Surely we must agree that the prefix "deci" means by ten!   
      
   By 1/10th actually, and YES it's ALWAYS 1/10th of a BELL!   
   You are simply allowing for the E^2 term when using 20 instead of 10 for   
   voltage.   
      
   MrT.   
      
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