In a recent press release
, Holosonic Research Labs revealed their latest technique for cutting through the advertising blitz to grab people's attention. A four-story billboard for an A&E television series "Paranormal State" is accentuated with a focused audio system mounted on the top of the building. The isolated beam of ultrasound is focused on a small patch of New York City sidewalk below.
People walking through the targeted area hear a woman's voice whispering "Who's that? Who's there? It's not your imagination."
, another company selling this sound equipment, says that sound is transmitted as an ultrasound beam, and becomes audible on impact with a surface. IRI says that when aimed at a person, the ultrasound beam will give the target the impression of hearing a voice inside their head.
Traditional loudspeaker systems do not see much use in advertising due to noise bylaws and drawing complaints from neighbours and other businesses.
A&E disconnected the audio system after the first week of the billboard campaign.