7.1 surround sound by pc10201

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									7.1 surround sound
From Wikipedia, the free encyclopedia

7.1 surround sound is the common name for an eight-channel surround audio system commonly used in home theatre
configurations. It adds two additional speakers to the more conventional six-channel (5.1) audio configuration. As with 5.1
surround sound, 7.1 surround sound positional audio uses the standard front, center, and LFE (subwoofer) speaker
configuration. However, whereas a 5.1 surround sound system combines both surround and rear channel effects into two
channels (commonly configured in home theatre set-ups as two rear surround speakers), a 7.1 surround system splits the
surround and rear channel information into four distinct channels, in which sound effects are directed to left and right surround
channels, plus two rear surround channels. In a 7.1 surround sound home theatre set-up, the surround speakers are placed
to the side of the listener's position and the rear speakers are placed behind the listener. [1] In addition, with the advent of
Dolby Pro Logic IIz and DTS Neo:X, 7.1 surround sound can also refer to 5.1 surround sound configurations with the addition
of two front height channels positioned above the front channels or two front wide channels positioned between the front and
surround channels.[2]

          Contents
 1 History
     1.1 Home entertainment
     1.2 Cinema
     1.3 Music
 2 References


History

Home entertainment
The Blu-ray Disc and the HD DVD home video formats provide up to 8 channels of lossless DTS-HD Master Audio, Dolby
TrueHD or uncompressed LPCM audio at 96 or 48 kHz/24 or 16-bit. The Sony PlayStation 3 video-game console can output
up to 7.1 LPCM through HDMI for both Blu-ray movies and games.

Cinema
While some films have been remixed to 7.1 audio tracks on Blu-ray Discs for home cinema, [3] the first discrete theatrical 7.1
soundtrack was Toy Story 3,[4] followed by Step Up 3D. Disney announced that they will use 7.1 surround for their future 3D
releases.[citation needed] Recent titles include Megamind, Tangled, Tron: Legacy, Gnomeo and Juliet, Mars Needs Moms,
Gulliver's Travels and The Chronicles of Narnia: The Voyage of the Dawn Treader. [5] In 2011, additional movies were
released with theatrical 7.1 audio, including Thor,[6] Pirates of the Caribbean: On Stranger Tides,[7] Kung Fu Panda 2, Super
8, Green Lantern, Cars 2, Transformers: Dark of the Moon and Captain America: The First Avenger. All these titles are
exhibited in the Dolby Surround 7.1 theatrical format. [8]

Music
The history of electronic music includes the evolution of multi-channel playback in concert (arguably the real roots of 'surround
sound' for cinema) and for a considerable time the 8-channel format was a de facto standard. This standardisation was
fostered, in great measure, by the development of professional and semi-professional 8-track tape recorders - originally
analog, but later manifesting in proprietary cassette formats by Alesis and Tascam. The speaker configuration, however, is
much less traditional, and unlike cinematic reproduction systems, there is no hard-and-fast 'standard'. In fact, composers took
(and to some extent still take) considerable interest in experimenting with speaker layouts. In these experiments, the goal is
not limited to creating 'realistic' playback of believably natural sonic environments. Rather, the goals are often simply to
experience and understand the effect created by variations on source and imaging.
References
  1. ^ "5.1 vs 7.1 Channel Home Theater Receivers - Which is Right For You?" . About.com. Retrieved 2012-06-04.
  2. ^ "Dolby Pro Logic IIz" . Dolby Laboratories. Retrieved 2011-10-07.
  3. ^ "7.1 Blu-ray" . Blu-rayStats.com. Retrieved 2011-05-22.
  4. ^ Flinn, Ryan (2010-03-23). "Pixar Gets Dolby to Invent `Rain of Sound' Technology to Match 3-D Movies" . Bloomberg.
     Retrieved 2011-05-22.
  5. ^ "Dolby Marks 40 Years in Cinema with Major Digital Cinema Milestones" . Dolby Laboratories. 2010-11-10. Retrieved 2011-05-
     22.
  6. ^ "Thor"   . IMDB. Retrieved 2012-06-20.
  7. ^ "Pirates of the Caribbean: On Stranger Tides"   . IMDB. Retrieved 2012-06-20.
  8. ^ Giardina, Carolyn (2011-03-28). "'Pirates of the Caribbean,' 'Kung Fu Panda 2' to Use Dolby 7.1 Surround Sound."   . The
     Hollywood Reporter. Archived from the original on 30 March 2011. Retrieved 2011-03-29.



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