7.1 surround sound: Difference between revisions

<!-- Deleted image removed: [[File:Standard 7.1 sound speaker placement.png|thumb|right|270px|Standard 7.1 sound speaker placement configuration]] -->
{{Short description|Sound systems that use 7 speakers and one subwoofer}}[[Image:7 1 channels surround sound.svg|thumb|right|200px|Label for 7.1 extended surround sound]]'''7.1 surround sound''' is the common name for an eight-channel [[surround sound|surround]] audio system commonly used in [[home cinema|home theatre]] configurations. It adds two additional speakers to the more conventional six-channel ([[5.1 surround sound|5.1]]) audio configuration. As with [[5.1 surround sound]], 7.1 surround sound positional audio uses the standard front left and right, [[center channel|center]], and [[Low-frequency effects|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 ('''SL''' and '''SR'''), plus two rear surround channels. ('''SBL''' and '''SBR''').

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.<ref>{{cite web|url=https://www.lifewire.com/5-1-vs-7-1-home-theater-receivers-1846774|title=5.1 vs 7.1 Channel Home Theater Receivers - Which is Right For You?|access-date=2012-06-04}}</ref><ref>{{Cite web |title=Help Guide {{!}} Installing 7.1-channel speaker system using surround back speakers |url=httphttps://hometheaterhelpguide.aboutsony.comnet/odha/hometheateraudiobasicsstrdh77/qtv1/5-1vs7-1diffen/contents/TP0000960364.htmhtml |publisheraccess-date=[[About.com]]|accessdate=20122023-06-0412 |website=helpguide.sony.net}}</ref> In addition, with the advent of [[Dolby Pro Logic#Dolby Pro Logic IIz|Dolby Pro Logic IIz]] and [[DTS (sound system)#DTS Neo:X|DTS Neo:X]], 7.1 surround sound can also refer to 7.1 surround sound configurations with the addition of two front [[height channels]] ('''LH''' and '''RH''') positioned above the front channels or two front wide channels positioned between the front and surround channels.<ref>{{cite web|title=Dolby Pro Logic IIz|url=http://www.dolby.com/professional/technology/home-theater/dolby-pro-logic-IIz.html|publisher=[[Dolby Laboratories]]|accessdateaccess-date=2011-10-07|archive-url=https://web.archive.org/web/20110926135007/http://www.dolby.com/professional/technology/home-theater/dolby-pro-logic-IIz.html|archive-date=2011-09-26|url-status=dead}}</ref><ref>{{Cite web |title=Help Guide {{!}} Names and functions of speakers |url=https://helpguide.sony.net/ha/strdh77/v1/en/contents/TP0001042609.html |access-date=2023-06-12 |website=helpguide.sony.net}}</ref>

The [[Blu-ray Disc]] and the [[HD DVD]] home video formats provide up to eight channels of [[Lossless audio#Lossless audio compression|lossless]] [[DTS-HD Master Audio]], [[Dolby TrueHD]] or uncompressed [[Linear pulse-code modulation|LPCM]] audio at 96/48kHz48&nbsp;kHz 24/16-bit., The Sonyor [[PlayStation 3Data_compression#Lossy_audio_compression|lossy]] video-game[[Dolby consoleDigital can outputPlus]] up to 7.148 LPCMkHz throughat HDMI for both Blu-ray1024 movieskilobytes andper gamessecond.

While some filmsmovies have been remixed to 7.1 audio tracks on Blu-ray Discs for home cinema,<ref>{{cite web|title=7.1 Blu-ray|url=http://blu-raystats.com/Stats/Stats.php?Audio=7.1|publisher=Blu-rayStats.com|accessdateaccess-date=2011-05-22}}</ref> the first discrete theatrical 7.1 soundtrack was ''[[Toy Story 3]]'' in 2010,<ref>{{cite web|last=Flinn|first=Ryan|title=Pixar Gets Dolby to Invent `'Rain of Sound' Technology to Match 3-D Movies|url=https://www.bloomberg.com/apps/news?pid=newsarchive&sid=ah18THYl9mVM|publisher=[[Bloomberg L.P.|Bloomberg]]|accessdateaccess-date=2011-05-22|date=2010-03-23}}</ref> followed by ''[[Step Up 3D]]''. [[Walt Disney Pictures|Disney]] announced that they will use 7.1 surround for their future 3D releases.{{cncitation needed|date=June 2012}} Recent titles include ''[[Megamind]]'', ''[[Tangled]]'', ''[[Tron: Legacy]]'', ''[[Gnomeo and Juliet]]'', ''[[Mars Needs Moms]]'', ''[[Gulliver's Travels (2010 film)|Gulliver's Travels]]'' and ''[[The Chronicles of Narnia: The Voyage of the Dawn Treader]]''.<ref>{{cite web|title=Dolby Marks 40 Years in Cinema with Major Digital Cinema Milestones|url=http://investor.dolby.com/releasedetail.cfm?ReleaseID=516952|publisher=[[Dolby Laboratories]]|accessdateaccess-date=2011-05-22|date=2010-11-10|archive-url=https://web.archive.org/web/20110710143610/http://investor.dolby.com/releasedetail.cfm?ReleaseID=516952|archive-date=2011-07-10|url-status=dead}}</ref> In 2011, additional movies were released with theatrical 7.1 audio, including ''[[Thor (film)|Thor]]'', ''[[Pirates of the Caribbean: On Stranger Tides]]'', ''[[Kung Fu Panda 2]]'', ''[[Super 8 (2011 film)|Super 8]]'', ''[[Green Lantern (film)|Green Lantern]]'', ''[[Cars 2]]'', ''[[Transformers: Dark of the Moon]]'', ''[[Captain America: The First Avenger]]''. In 2012, [[Pizza (2012 film)|Pizza]], a Tamil film was released with this theatrical 7.1 audio. All these titles are exhibited in the [[Dolby Surround 7.1]] theatrical format.<ref>{{cite web|url=http://www.hollywoodreporter.com/news/pirates-caribbean-kung-fu-panda-171990|title='Pirates of the Caribbean,' 'Kung Fu Panda 2' to Use Dolby 7.1 Surround Sound.|publisherwork=''[[The Hollywood Reporter]]''|first=Carolyn|last=Giardina|date=2011-03-28|accessdateaccess-date=2011-03-29| archiveurlarchive-url= https://web.archive.org/web/20110330051352/http://www.hollywoodreporter.com/news/pirates-caribbean-kung-fu-panda-171990| archivedatearchive-date= 30 March 2011 <!--DASHBot-->| deadurlurl-status= nolive}}</ref>

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 signal|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 [[psychoacoustics]] effect created by variations on source and imaging.