XPost: rec.music.gdead, sci.electronics.design   
   From: jeroen@nospam.please   
      
   SoothSayer wrote:   
   > [...]   You have to MODULATE the AMPLITUDE of a   
   > "carrier" with the intended "signal"..   
   >   
   >   Simply seeing something that appears to be "enveloped" does not mean   
   > that it is amplitude modulated. Linear summation does not get you there.   
      
   Time for a trigonometry refresher course:   
      
   Modulation is multiplication of two signals, e.g., for sine waves   
   cos A * cos B.   
      
   A basic trigonometric identity tells us this is identical to:   
   0.5 cos(A+B) - 0.5 cos(A-B), which is a simple linear sum of   
   sine waves.   
      
   In conclusion, your assertion that linear summation can't   
   get you a modulated waveform is wrong.   
      
   Jeroen Belleman   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)