Hi, Eric,

A lot of computers (especially HP) are notorious for that. It is a hardware 
design flaw as Joe W4TV has described. 

If you disconnect the power supply from your laptop (i.e. run on battery power) 
and try it again you'll probably notice a significant improvement in the noise 
level of your recorded audio. What does that tell you?

I had to resort to using an external sound card to digitize audio and then suck 
it into the computer via USB. Something like the M-Audio or similar devices 
that 
you can find at Guitar Center for recording musical instruments. Using one of 
these the audio is clean. Good luck in your efforts.

Regards,

Al  W6LX
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