Deep Note

Deep Note is the name of THX's audio logo, a distinctive synthesized crescendo sound. It was created by Dr. James A. Moorer, then an employee of the Lucasfilm Computer Division, in 1983. The sound is used on trailers for THX-certified movie theatres and video releases; it debuted in the THX trailer shown before the 1983 premiere of Return of the Jedi in Los Angeles.

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