Feedback in FM synthesis

[Don Tillman]

   From: "Theo" <t.hogers at home.nl>
   Date: Tue, 8 Aug 2000 00:02:04 +0200

   "For simplifying the operation circuit by substituting a linear
   multiplication operation by a logarithmic addition, the sine wave 
   table 53 stores sine function values in logarithm."

   It is easy to see why this is easyer to implement (takes less cells).
   What I don't get is why the logarithmic addition is the same as a linear
   multiplication.

Ever seen a slide rule?  (Analog computational device that fell out of
fashion because it couldn't be used to download pornography.)  :-)

log(x * y) = log(x) + log(y)

  -- Don

-- 
Don Tillman
Palo Alto, California, USA
don at till.com
http://www.till.com