I've been recently going nuts recording some home-made samples. One issue I constantly run into is... how do I remove the 'background radiation'?
And by 'background radiation', I mean the ambient noise of the world at large. I'm not talking about acute things like cars, planes, etc. But you know what I mean... the 'rumbling noise' that just seems to be a part of the great outdoors... even with no wind... it's just -there-.
I mean the sound is even in your house or office (if it's not totally treated). It's amazing how our ears naturally filter this out.
How is this removed for use in broadcasts or when taking field recordings into the studio?