The Eat at Joe's Kawai K5000 Message Board Digest
Performing Ring Modulation on the K5000


------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------


What-I-Found-Out #3: Ring Modulation
Saturday, 14-Mar-98 06:41:16 

     195.232.50.106 writes:

     The K5000 can do ring modulation! (Did anyone know?) 
     Recall our amplitude modulation discussion. Assume, "AM" (in the "Common" menu of
     your K5000) is set to "1->2". That is, SOURCE2 will be the
     carrier and SOURCE1 will be the modulator. The AM formula told us: 

     AM_SIGNAL = ( S1_AMPLITUDE * SOURCE1 + 1 ) * SOURCE2 

     = S1_AMPLITUDE * SOURCE1 * SOURCE2 + SOURCE2 . 

     Well, the Kawai people seem to have followed a different concept. They use the
     level values of both sources and get a more flexible AM formula: 

     AM_SIGNAL = S1_AMPLITUDE * SOURCE1 * SOURCE2 + S2_AMPLITUDE * SOURCE2 . 

     Make an experiment: 
     Set the number of sources to "2" and AM to "1->2". Take loud, but simple tonal
     signals for both source 1 and source 2 and set the pitches to some odd
     interval. You get some metallic sound. Now go to the "Control" menu and play
     with the volume values: With the SOURCE1 volume you can adjust the
     modulation amount, as could be expected. But with the SOURCE2 volume you can
     adjust the "carrier", too. If you turn it completely down to zero, the
     pure "sideband" signals remain, and that is nothing else but ring modulation: 

     RM_SIGNAL = S1_AMPLITUDE * SOURCE1 * SOURCE2 . 

     With AM, you could not get rid of the carrier frequencies, but now you can. 


     Jens Groh 

------------------------------------------------------------------------------------------

Re: What-I-Found-Out #3: Ring Modulation
Monday, 16-Mar-98 10:17:37 

     199.86.33.63 writes:

     So you can fade from AM to RM by fading out the carrier, source 2?

     leiter@skypoint.com 

------------------------------------------------------------------------------------------

Re: Re: What-I-Found-Out #3: Ring Modulation
Monday, 16-Mar-98 10:34:46 

     194.172.230.108 writes:

     Yes.

     Jens Groh 


------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------