New computer virus spreads silently through speakers!

Ok now this is getting creepy!  A person by the name of +Dragos Ruiu  on Google plus was posting about how he was installing MAC OS and how his BIOS was getting changed.
    This person is a highly respected computer security expert, and his claims are getting noticed!
    What he found was a sonic sounding backdoor for viruses.
  Mr. Ruiu heard a high pitch whine in his home sound system and investigated what it was coming from.  It wasn't the electrical system like he had hoped...here's what he found:

when disabling the receiving computers microphone the sound ceased-  the sound was being sent from another computer.  This is a new type of air-gap virus.  It lies dormant until an audio signal wakes it up.  It's an ultrasonic signal.

Spooky, creepy, un nerving -  all these things....

    You can read about it here: http://www.newscientist.com/article/dn24582-can-a-computer-virus-communicate-via-your-speakers.html