[sdiy] Idea for tuner/display

[Tim Ressel]

Jay,

I would be using a timer internal to the uP. It is
basically a 16-bit counter clocked at 2MHz. When the
input transitions the counter is latched and the
processor is sent an interrupt. With this clock I can
get approx. 2 cents resolution at A4. 

If it turns out I need more resolution, I'll just hire
an intern and have him sell his soul...   ;-)

--Tim


--- Jay Schwichtenberg <jays at aracnet.com> wrote:
> Tim,
> 
> I been thinking about the same type of thing.
> 
> One problem I have with the counter type stuff is
> the speed. At low
> freqencies these are slow. I was wondering if there
> might be a way to do it
> like a guitar tuner. They seem to work faster. I
> think the way they usually
> work is with a beat frequency.
> 
> Also when doing counters you have to do some
> averaging to keep the readout
> from flickering in the low digits.
> 
> LCD vs LED. If you are a typical electronic musician
> you probably work in
> dark places. LCD will need a backlight to be seen in
> the dark. While LCDs
> take less to run from the uP (vs scanned LEDS) they
> are slower.
> 
> Just some thoughts.
> Jay
> 
> > -----Original Message-----
> > From: owner-synth-diy at dropmix.xs4all.nl
> > [mailto:owner-synth-diy at dropmix.xs4all.nl]On
> Behalf Of Tim Ressel
> > Sent: Sunday, January 26, 2003 11:17 AM
> > To: Synth-Diy
> > Subject: [sdiy] Idea for tuner/display
> >
> >
> > Hey all,
> >
> > I have a whacky idea for a uP tuner/note display
> that
> > I want to run past y'all. This would be a little
> box
> > with an LCD screen and an input jack or two. The
> uP
> > behind the screen would use its timer to measure
> the
> > input frequency and perform some math tricks to
> come
> > up with the nearest note and how far from that
> note
> > the input was. Then it would display the info on
> the
> > LCD. An even more whacky version would do this for
> two
> > inputs and also calc the interval between the two.
> >
> > Comments? Ideas?
> >
> > --Tim
> >
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> 
> 


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