On Fri, 06 Nov 2009 19:03:53 -0500, "Michael A. Terrell"
wrote:
Jim Thompson wrote:
On Fri, 6 Nov 2009 20:53:53 -0000, "ian field"
wrote:
[snip]
Can't I just make a PLL lock on to the frequency and stay put after the note
has decayed, then measure the frequency with a digital frequency counter?
A PLL that doesn't drift once it loses reference ?:-)
yeah. A Pathetic Locked Loopy.
I suppose you _could_ put a sample and hold on the control voltage,
but my experience with _good_ PLL's is that it takes around 100
reference cycles to ensure accuracy, _before_ you could "coast".
I think it should really be done with a high speed counter to get
signal period.
...Jim Thompson
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