> I've read the pros/cons/anecdotes regarding the JPS ANC-4 and
> its brethren. But the thought occurs to me: Can the same noise
> cancelling technique be used at audio frequencies and still
> achieve the same goal?
>
> 73 Kris N5KM
Yes. Plantronics (and several other manufacturers) make noise-cancelling
headsets for aviators who would otherwise go deaf from cockpit noise. The
pilots of the Voyager, Gary (?) and Deanna Yaeger, wore prototypes of this
headset on their round-the-world-without-refueling flight a few years ago.
Also, some automotive manufacturers are developing noise-cancelling
mufflers to reduce exhaust noise. Imagine...an active muffler!!
Another application for RF noise-cancellers is to reduce overload from a
loud, nearby station, by the way. As they move around, you have to keep
tweaking it, but if you're near a ham with an amp, it can occasionally
save your sanity! I've tried it on BC stations with some success,
although a filter works better.
73, Ward N0AX
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