Pitch -> CV conversion

[Synthaholic aka sPEW]

On Wed, 12 Mar 1997 13:07:44 GMT, you wrote:

>On Wed, 12 Mar 1997 08:20:48 +0100 (MET), you wrote:
>>
>>Ok, why not using an external VCO together with the 4046 phase comparator.
>>Somebody reported some time ago that this works pretty good, even
>>if the ext. VCO is exponential. The waveforms may be a bit distorted, 
>>due to the  permanent phase modulation.

Let's assume that you want to create a CV to drive a VCO of type
'XYZ'.  If you build a PLL using the same type of VCO, it's linearity
curve will very closely match the VCO you are trying to drive.  In
otherwords, the CV produced should allow the driven VCOs to track the
input signal rather well.  Using the 4046 comparator circuitry, you
have two different comparators to choose from, both with different
characteristics.  The drawback of pitch->CV conversion using a PLL is
the built-in portamento and overshoot, depending on the loop filter
characteristics.  This can, however, produce interesting results.

YMMV.