Fast VCOs for wavetable

[Paul Maddox]

All,

>my input:  It has been fairly well agreed that no VCO we know of can
>handle running at 32-64 times the speed we normally use them with 
enough
>stability to reference a table.  Would it be possible to run a VCO
>(Stopp's?) at a normal speed and send that through a multiplier of some
>form?  I know there are many circuits out which do this at MUCH higher
>frequencies than audio, and they seem pretty stable.  It seems like a
>phase locked loop might do it.  Any thoughts?
>

PLL are ok for fixed frequencies but for "moveing" frequencies such as 
notes on a keyboard they are none too good...

Ive tried this and you have to set the damping on these.. now problem is 
if you over damp you dont get sudden changes in note (say an octave 
jump) if you under damp you get a rather interetsing "sproing" sound, as 
it over shoots then under then over then settles..

Ive looked at frequency doublers (full wave retifiers) feed in a saw and 
get a triangle from first stage then get subsequent triangles from 
others but a double the range, this is ok for a a couple of doubleings, 
but not 6 stages the waveform just gets horribly messy and distorted and 
you couldn't trigger reliably from it.

Paul Maddox



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