Definitions for "Dolby Digital EX"
Keywords:  realism, thx, matrix, rear, encodes
A surround-sound format that matrix-encodes a"back-surround" channel into the left and right surround channels of a 5.1-channel Dolby Digital signal. This back-surround channel is reproduced by one or two loudspeakers located directly behind the listening position. Although Dolby Digital EX is the format's official name, it's often called THX Surround EX because THX was the exclusive licensor of the technology until late 2001. Jointly developed by Lucasfilm THX and Dolby Laboratories.
Referred to as Dolby Digital 6.1, this encoding method adds a matrixed rear surround speaker to Dolby Digital 5.1. Occasionally a second rear surround speaker is added. In this setup, both rear surround speakers produce the same signal, and are typically positioned next to each other. This is referred to as Dolby Digital 7.1.
A Dolby surround sound system that includes a "center rear" channel to the 5.1 playback format. This additional rear surround channel provides increased spatiality and realism for audio effects that pan from front to back as well as enhanced localization of surround channels that originate from directly behind the listener. (see Dolby Digital)