At 11:46 AM 3/9/00 -0800, you wrote: >> 1. Subtract DC bias count (= 128) from signal if > 128, subtract signal >I was planning to sample about 8Khz and run thru simple IIR filter, the >output works the bargraph. But the RMS thread has gotten me thinking: >would this really do what I need? What exactly the heck is a Volume Unit >anyway? Is there an algorithm that makes more sense? You'll need something like a log response for it to make sense... =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Spehro Pefhany "The Journey is the reward" speff@interlog.com Fax:(905) 271-9838 (small micro system devt hw/sw + mfg) =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=