fredbloggs;217853 Wrote: 
> As for the continous tone, it's a very clean beeeeeeeeeeeeeeep type
> thing, doesn't sound distorted but is at a high enough volume that if I
> increase the headphone volume I can gradually hear the talking over the
> top, though this quickly gives me a headache and become distorted.
Intruiging... the only thing that seems to fit that would be if there's
some sort of ultrasonic tone (eg. around the 20kHz mark) mixed in which
is designed to generate an audible beat frequency when added to some
other high frequency tone (eg. the bias signal when using an analogue
tape recorder).

But assuming you're recording with a soundcard, as far as I am aware
there will be no other high frequency tone involved that could generate
a beat frequency. So I have to say I'm baffled. Perhaps you could upload
a short section (just a few seconds) of a recording that includes this
tone - some of us around here have a bunch of audio analysis tools that
might shed a bit more light on it.


-- 
cliveb

Transporter -> ATC SCM100A
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