[sdiy] analog pitch shifter circuit?

[Bill Thompson]

Paul Maddox wrote:

>Maybe its me but,
>Couldn't you use good old fashioned hetrodyne techniques?
>no digital stuff involved (no huge amounts of memory).
>
>Just a thought
>
And a good one... I thought about mentioning it, but the thread seemed 
to be headed in an opposite direction<G>!

FWIW I've built three pitch shifters, the first used the hetrodyne 
approach, the second used a ring modulator, which one could argue is 
similar to the first I suppose, and the third used a BBD driven by a 
sawtooth. I wasn't really thrilled with any of them<G>! If I had to pick 
a favorite, I guess I'd choose the first, but it was a real bear to get 
working!

For anyone who just wants to play with the third approach, most of the 
older analog delay pedals can be pressed into service. The simplest demo 
is to simply play something into it and move the delay time knob real 
fast... instant pitch shift!

Take care,

Bill

PS- just found this list before the holidays... it is very cool!!!

- 
Bill Thompson
Audio Enterprise
KB3KJF
--
"All truths are easy to understand once they are discovered; the point is to discover them."
Galileo Galilei.
--