[WARC] Nic Net Tonight!

[jarvis at jarviscomputer.com]

Hello All,

My testing was with a vacuum cleaner as a noise source and the noise
canceling was effective.

In a large room the conversations are not like discrete signals but mix
into a din.  My guess is that the noise canceling head phones would help
in this situation.   Do they really integrate or do they listen and react?

Clare


> What kind of "noise" do noise cancelling headphones eliminate?
> These devices integrate noise over time and eliminate the noise
> by producing out-of-phase counterparts and linearly adding the
> two waves. That means they are most effective on stable noise
> sources, such as jet engine noise in airliners, components of
> vehicle road noise, etc. They are less effective on short
> duration pulse noise and sounds whose spectra vary with time
> (like speech.)
>
> In addition to the electronic noise elimination, noise canceling
> headsets usually feature very effective acoustic isolation from
> outside noise sources. I suspect such isolation, rather than the
> electronic DSP systems, is most effective in communications
> center environments.
>
> I admit, I haven't listened to every noise canceling headset on
> the market, but this has been my experience. I actually decided
> not to purchase a pair but then I just got one from my son for
> Christmas. My experience with that set so far bears out my other
> observations and I believe I will most often use the headset
> when flying.
>
> I know that Clare has a set of noise canceling headphones and
> would be interested in his observations, since I was unable to
> be in the net tonight.
>
> -Les
>
> ----- Original Message -----
> From: "Len Litvan" <Litvan at acegroup.cc>
> To: "W0NE Listserv" <warc at lists.w0ne.org>
> Sent: Sunday, December 30, 2007 21:32
> Subject: [WARC] Nic Net Tonight!
>
>
>> Hi folks,
>>
>> That was a good net tonight--very informative.
>>
>> I especially liked the info about noise-canceling headphones.
> I was
>> about to buy a conventional headset (to replace the Radio
> Shack and
>> assortment of other earphones around) but was not considering
> noise
>> canceling types.
>>
>> The comments about noise canceling at emergency sites was a
> big factor
>> in persuading me to go upscale and get a noise-canceling set.
> Thanks
>> for helping me spend our money wisely!
>>
>> 73,
>> Len KC0RSX
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>
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