Dolby Digital EX
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Dolby Digital EX is an extension of Dolby Digital - Multi-channel sound system and was in 1999 with the film Star Wars: Episode I imagined.
To 5.1 - speakers of the Dolby Digital comes system's / come another (6.1) or two (7.1) Back-surround channel / channels to correspondingly reproduced through one or two speakers / n.
The signal from this sixth channel is encoded in the signal for the left and right surround channels (the signal corresponds to all tones that are identical in the left and right surround channels) and decoded with a special decoder. The coding is carried out via phase coding, similar to the matrix coding of the analog Dolby Pro Logic . This ensures backward compatibility with Dolby Digital 5.1 .
The cinema version works on the same principle and is called "Dolby Digital Surround EX".
In the home theater, a 6.1 arrangement only makes sense if there is a very large distance between the left and right surround channels. Otherwise the reproduction of the seventh channel (center surround) is sufficient via the 5.1 arrangement, with a phantom surround center being formed via the two surround speakers.
literature
- Thomas Görne: Sound engineering. 1st edition, Carl Hanser Verlag, Leipzig, 2006, ISBN 3-446-40198-9
- Hubert Henle: The recording studio manual. 5th edition, GC Carstensen Verlag, Munich, 2001, ISBN 3-910098-19-3