Have a question from the Phoenix area

Hi there everyone
I am not a Trucker or a CBer but a working lady in Phoenix. My son the computer guru put together my computer. I sometimes get the transmissions of a CBer (I think he is a trucker in the Phoenix area) through my computer speakers. These are just one way transmissions - just what he says to other CBers. He is someone in the Phoenix area- and I am wondering if any of you have heard of radio transmissions coming through computers - it kind of spooks my grand daugter (she's 13) when she plays on my computer and his voice all of a sudden comes through. I am so grateful that he is a very respectful person - never any vile language. I have asked my brother in law who was a CBer years earlier and even my computer guru but they have no clues. I would appreciate any ideas any of you have. He sometimes says "308 Phoenix" but other than that I have no idea who he is or why he comes through my computer. Thanks Phoenix lady