An enhancement to the Dolby Digital 5.1 where a rear center channel has been added creating a 6.1 format. The Dolby Digital Surround EX format does not add an additional discreet recorded channel. The new rear center channel is matrix-encoded in the Dolby Digital left and right surround signals. The recorded Dolby Digital audio consists of five discrete main channels and a sixth, low-frequency-effects (LFE) channel. The two rear surround channels carry the signal for the rear center channel. The Dolby Digital Surround EX format made is debut in the 1999 movie Star Wars Episode I - The Phantom Menace.