[sdiy] F2V with PIC or AVR?

[Harry Bissell]

The really tough part is to condition the signal so that you can get ONLY the fundamental frequency.
Pitch-to-Voltage is the easy part.  Most of the signal processing involves figuring out when a note
begins, when it ends, and when you can no longer trust the input to be valid (enter hold mode etc.)

The PV-1 will not work (correctly) unless you have a good input signal...

H^) harry


----- Original Message -----
From: David G. Dixon <dixon at interchange.ubc.ca>
To: lanterma at ece.gatech.edu, synth-diy at dropmix.xs4all.nl
Sent: Sun, 10 Apr 2011 04:37:16 -0400 (EDT)
Subject: Re: [sdiy] F2V with PIC or AVR?

> >> I think Harry Bissell has a F-to-V circuit too, IIRC.
> > 
> > The Bissell circuit is very elegant.  It is based on a two-bit 
> > counter, and only requires two clock cycles to sample the frequency.
> 
> Is it two-bit as in two binary digits, or two-bit as in cheap? ;)

The former, although it doesn't involve anything very exotic.  The circuit
does its thing every four clock cycles.  During the first two it reads the
frequency and generates the voltage, and during the second two it stores the
voltage on a capacitor (IIRC).  It's pretty cool, and a bit of an education
(as with most of Harry's circuits).  Here's the link to all the info:

http://synthdiy.com/files/2008/pv1_611.pdf


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-- 
Harry Bissell & Nora Abdullah 4eva