I was thinking about writing a sound filter.  So from this lister
perspective I'm wondering where I can get a mini-stereo jack input
like you see radio/mp3 players have for headphones. Then from a
programming i/o perspective what would that be considered and how do
you interface with that? Guessing there is some form of
analog-to-digital converter.

First project is to try and create a noise filter. When listening to
HF radio (ham) you can get a lot of noise. Thought by sampling I could
build a nice list of what to cancel out :)

Thanks for your time,
-Josh
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