[sdiy] Analysis of frequency variation in analogue synths

[Ian Fritz]

At 07:10 PM 5/2/2007, Paul Perry wrote:

>I guess if you were wanting to get an idea of what variation was happening
>at 1Hz and below, you could just ring modulate between the signal and a
>crystal locked oscillator (or some digital source you trust). With the right
>choice of reference signal, the pattern should be obvious.


Or perhaps you could make a simple FM discriminator, again with a solid 
xtal source as the reference.

I did this for some music teachers who wanted to display their vibrato.  It 
didn't work too well because of the phase skips (this was for violin) but 
it could be OK here.

   Ian