Audio Choke?

[Paul Horwood]

HI,

I have a question regarding a radio reciever. Now I know I can do this
another way but here is the idea.

The recieved radio signal is embedded deep within noise. Is it possible to
take the audio signal and use a choke or something to kill the noise so that
just the signal can then be heard and amplified?

I don't really want to tamper with the innerds of the radio... Still under
garantee...

Paul,,,,

 

[Dave]

I take it you have a weak AM station? You are basically describing a tone
control, but they do it with capacitors (the opposite of a choke)- you could
use a choke but a capacitor is cheaper. You would get more bass with a
choke in series or capacitor in parallel with speaker (this is normally done
at the preamp stage). Putting capacitor in parallel with speaker would
lower impedance and may blow amp, so choke might work if you are lucky and
it is adjustable. I would descibe your situation better and you might get
better advice...if you have preamp outputs would use an audio
equalizer...if weak AM signal a better antenna try ham radio forums...if 60
cycle hum that's another problem.
Dave


"Paul Horwood" <Paul.Horwood@ntlworld.com> wrote in message
news:Eqkee.17557$Y46.12947@newsfe1-win.ntli.net...

HI,

I have a question regarding a radio reciever. Now I know I can do this
another way but here is the idea.

The recieved radio signal is embedded deep within noise. Is it possible to
take the audio signal and use a choke or something to kill the noise so
that
just the signal can then be heard and amplified?

I don't really want to tamper with the innerds of the radio... Still under
garantee...

Paul,,,,

 

[John Woodgate]

I read in sci.electronics.design that bigcat@meeow.co.uk wrote (in
<1115460177.534365.321650@f14g2000cwb.googlegroups.com&gt about 'Audio
Choke?', on Sat, 7 May 2005:

You can cut the higher audio frequencies, since that will remove a lot
of noise while still leaving the audio intelligible.

Intelligibility drops off rapidly as the cut-off frequency is reduced
below 4 kHz. The subjective impression of the sound can be improved by
cutting the low frequencies as well. 3dB down at 250 Hz and 4 kHz gives
a reasonably 'balanced' sound quality.
--
Regards, John Woodgate, OOO - Own Opinions Only.
There are two sides to every question, except
'What is a Moebius strip?'
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk