November 25th 04, 01:34 PM
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"Licensed to Quill" wrote in message
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Yes, I was the original poster on this because I KNEW that they only read
outside sound and cancel it and are specifically designed NOT to interfere
with input sound but Iwas astounded when I trued them with shortwave
radios
and found that they do somehow block out some of the background noise
which
comes in through the ether??
It's a bit scary if they DO do this because it implies that they will
interfere with some frequencies in an audio signal which their
manufacturers
(except Bose) strenuously deny that they do. I suppose it is all a matter
of experimentaion with different manufacturers. (Bose emphasises
technical
proficiency, build quality and above all, marketing, over sound).
I remember when they started to be produced (initially for airplane use)
there was a heated discussion on some group or other about whether you
need
LOW or HIGH freq blocking to get rid of jet noise.
This was supposed to be the difference between the original NC headphone
made by the company in Hauppauge LI which invented them in the commercial
marketing sense: I seem to remember they blocked low freq roar. For High
freq blocking you went to the Sony NCs, I think it was. The other course
was
to fool the ear into thinking that you are geting blocking by expanding
dynamic range at certain freqs while selectively blocking certain
frequencies and increasing volume on others (this is what the Bose ones
do).
"Lucky" wrote in message
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"Ron Hardin" wrote in message
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Lucky wrote:
I have no idea if they are any good, but this Friday CompUSA has a
sale
on
them.
They are $55 on sale for $20. They look like Aiwa brand but I can't be
sure.
I'm going to try a pair and see how they are if they don't only have 3
per
store and sell out. You know how these loss leaders go.
Lucky
They cancel audio room noise, not received input noise, in case anybody
is
unclear on this.
Say leaf-blower noise from the neighbor, or the dishwasher running, or
computer fans.
Mostly they cancel some of it, not all of it.
I use a pair of Bose noise-cancelling headphones, less cord just the
phones,
mowing the lawn; or used to before I went to a scythe, which is more
entertaining.
http://scythesupply.com if anybody's interested in that possible hobby.
Every nice day, take a break from inside the house and cut a couple of
12' wide swaths down the lawn. In a few days, the lawn is done, and
it's
time to start over.
(Noise-cancelling headphones can't deal with _really_ loud noise, like
gunshots, because they'd overload; unlike say earplugs)
--
Ron Hardin
On the internet, nobody knows you're a jerk.
Hmmm...I will admit I thought they did both.
Keep noise out and filter the input somewhat.
Thanks for the heads up Ron. I may not look at them now unless I get
bored.
Lucky
You have the brand that CompUSA is selling?
What brand are they?
Lucky
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