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7.1 surround sound
7.1 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.〔(【引用サイトリンク】url=http://hometheater.about.com/od/hometheateraudiobasics/qt/5-1vs7-1diff.htm )〕 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.〔(【引用サイトリンク】url=http://www.dolby.com/professional/technology/home-theater/dolby-pro-logic-IIz.html )〕
==History==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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