"Mxsmanic" wrote:

Dan Luke writes:

******** again. I have a radio that does actively remove noise--it has a
button to turn the feature on and off, and it works quite well.

What kind of noise does it remove, and how does it distinguish noise
from signal?

It removes a lot of the static noise. I do not know the technical details
of how it does it. However, the freqencies of human speech do not cover the
audible spectrum, and all extraneous frequencies may be filtered quite
easily. Even frequencies at the upper and lower ends of human speech may be
filtered with minimal effect on intelligibility. Perhaps it's as simple as
that.

--
Dan
C172RG at BFM