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From: 6062871@pucc.Princeton.EDU (Raj Manandhar)
Newsgroups: rec.audio,sci.electronics,rec.aviation
Subject: Re: Noise-cancelling microphone
Message-ID: <2780@pucc.Princeton.EDU>
Date: Sun, 24-May-87 20:54:17 EDT
Article-I.D.: pucc.2780
Posted: Sun May 24 20:54:17 1987
Date-Received: Mon, 25-May-87 04:45:20 EDT
References: <19549@sun.uucp> <1027@mips.UUCP> <689@cod.UUCP> <867@lll-lcc.aRpA> <2849@mit-hermes.AI.MIT.EDU>
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Organization: Princeton University - Princeton, New Jersey
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Disclaimer: Author bears full responsibility for contents of this article


In article <19549@sun.uucp>, brent%terra@Sun.COM (Brent Callaghan) writes:
 
>I remember some years ago reading a similar article in
>New Scientist about an optical element that had just been
>invented for large telescopes that corrected images that
>lay at the extremes of the telescopes' field.... The human
>eye can resolve detail sharply over a small area at the
>center of the visual field.  The new element would correct
>off-axis images so that the high visual acuity would extend
>over the whole visual field.  The amount of eye movement
 
I'm skeptical because, recalling my high-school biology, the human
eye's resolution is best for images that are focused on the fovea,
a small circle at the center of the retina that has a high density
of light-sensitive (and color-sensitive) cone cells. This is the
area that permits me to see what I am typing. Outside of this area,
the density is lower, so the device won't do much good. (Incidentally,
the fovea doesn't have many rod cells, which are black-and-white
things good for low light, which is why you can see in the dark better
using your peripheral vision).
 
Raj Manandhar '87  6062871@pucc.bitnet {ihnp4,etc.}!psuvax1!pucc.bitnet!6062871
609/734-7368       417 Edwards Hall, Princeton University, Princeton, NJ  08544