Deep Note

Deep Note is the name of THX's audio logo, a distinctive synthesized crescendo sound that glissandos from a rumbling low pitch to a high pitch. It was created by Dr. James A. Moorer, then an employee of the Lucasfilm Computer Division, in late 1982. The sound is used on trailers for THX-certified movie theaters , home video releases, video games, and in-car entertainment. It debuted in the THX trailer shown before the 1983 premiere of Return of the Jedi in Los Angeles.