fast A/D D/A?
Nick Gray
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>Subject: fast A/D D/A?
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>From: u811...@cc.nctu.edu.tw (Eric Huang)
>Date: 17 Feb 1995 10:35:25 GMT
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> I am interesting in reducing noise. If I can add
> a signal ( inverse phase, same amp), I will hear
> nothing totally.
> If I can design such a system, I can read , do
> something in a quiet enviorement. However, is there
> so fast A/D , D/A, and speaker? Is there any algorithm
> to predict signals? or is there already products in markets?
Automobile manufacturers have been working on this idea for some time to
replace the conventional muffler (which causes back pressure and a loss of
engine efficiency). But think about it. You can put a sensor near the source
and cancel it at a place, but not everywhere. Or, you can cancel it right at
the source, which requires some fairly fast circuitry.
I do not know of anything yet available to do this, although, like I said, the
automobile manufacturers have been working on the idea for at least a couple
of years.
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| Nick Gray National Semiconductor Corporation |
| Opinions expressed are those of the author and do not necessarily reflect |
| reflect the thinking or opinions of National Semiconductor Corporation. |
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Babak $ehari
I know of a US Choper that does this in the forward direction. This
makes the choper hard to hear in the dark.
With highest regards,
Babak Sehari.
--
"Giving power and money to the governments is like giving
whiskey and car keys to teenage boys."
- P.J. O'Rourke