Unfortunately, things don't work like that. We would all
have to have some sort of matching band-stop filters built in to
our heads for this to do any good and most of us are immune to
incoming radio signals anyway. We should all have a brick-wall
bologna filter to discard some of the stuff we hear on the radio
after it has been detected and decoded in the normal way but
before we start remembering it but that filter
is much more sophisticated and should be
installed between the pre frontal cortex and hippocampus so as
to prevent flooding of our memory with, well, bologna to put it
politely.
Sarah k Alawami writes:
> I thought now a days the broadcasting stations put up a brick wall filter
> at something like 800 or 900 hurts to prevent the public from
> accidentally picking up stuff like this with their teeth or electrical
> supplies that are never meant to do this. I can't remember the lecture we
> had in my class I took on such things and I no longer have all the tapes,
> but that's the one thing I remember, the brick wall filter that
> supposedly is on all am and fm transmitters.
Broadcast transmittters are loaded with all kinds of
filters but 800 or 900 hertz is smack dab in the middle of the
human hearing range and not likely to be filtered out.
The filters actually in AM transmitters that you might be
thinking of are there to prevent the sound that the station
broadcasts from covering a wider part of the spectrum on the
dial than absolutely necessary for good fidelity. In North,
Central and South America and a few other parts, possibly, AM
stations are separated every ten kilohertz from 530 to 1700
kilohertz in the AM broadcast band. In most of the rest of the
world, they are nine kilohertz apart so more stations can be
crammed in to the space that is already so full that night-time
listening is an exercise in futility in many places. If you've
ever been listening to a weak signal on AM and heard static that
was coming from a very strong station just up or down the dial,
you were hearing adjacent channel interference which is made
worse if the transmitter doesn't filter their audio above 9 or
ten kilohertz. Those filters are apt to be extremely tight but
it has nothing to do with radio being received on tooth fillings
or telephones.
Martin
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