[Kevin McMurtrie]

In article ,
"Knack" wrote:

We currently have one of the quietest ceiling fan models in our bedroom, but
I'm wondering if I can suppress that fan noise even further. However, we
don't want to wear earplugs or noise-cancelling headphones while we sleep.

Just an idea-- Was wondering if it could be possible to somehow make the
sensor and signal processor of one of those noise-canceling headphones (For
example, Panasonic RP-HC500) drive a larger amplifier, which would in turn
power a pair of small cheap PC type speakers. The little speakers could then
be spaced apart above the headboard of our bed.

Was hoping that I could obtain all components that I need (except the
RP-HC500 and the PC speakers) at Radio Shack or some other local electronics
components retailer. However, I'm not an electronics tinkerer so I have no
clue as to what the specs would be for those components.

From school (long ago) I have a vague and very limited knowledge of
electronics (Ohm's law, impedence matching), but know nothing about
amplifiers and next to nothing about filters/tuners.

Don't want to spend more than a total of US$400 on this. Is the idea
feasible? If so, then if someone could give me some tips/steering about the
specifics of what I would need, then I'd be greatly appreciative.

The area covered by simple noise cancellation is inversely proportional
to the frequency. Canceling noise in part of a bedroom probably
wouldn't work above 80Hz. This is why noise cancelation works great for
headphones but not for rooms.

My previous car had active noise cancellation for the low frequency
engine drone. Even that didn't work so well because it caused
mechanical rattles in panels near the speakers.