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Re: an infra-sound mystry

Subject: Re: an infra-sound mystry
From: "Rich Peet" <>
Date: Mon, 25 Aug 2003 23:53:00 -0000
That is what I thought too. But then I look at the FFT spectral 
display, which in Cooledit goes to 16,384.  The display is completing 
the curve down to 1/2 cycle in a short time frame.  I don't 
understand how in such a short time frame it is resolving 1/2 cycle.  
Is this bird really calling to 1/2 cycle.  Also, this was recorded 
with a me-62 and a consumer minidisc and not my mkh-110-1.  The mic 
is rated at 5 cycles and the MD is not rated that I know of which 
means they choose not to lie.  Is there such a thing as a sub-
harmonic? 

See my spectral display as a short download at:
http://home.comcast.net/~richpeet/grouse.jpg


> A 1/2 cycle audio will take two seconds to pass a given point. For 
one 
> complete wave cycle. At this level looking at the waveform rather 
than 
> the sonogram may give a better visual image. You can see such slow 
> cycles pretty easy. And measuring the time from wavetop to wavetop 
off 
> that display can give you frequency.
> 
> You are equipment limited as far as determining how low the bird 
goes. 
> Or may be equipment limited. 



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