What are the differences between 5.1 and 7.1 Channel Surround

Dec 03rd, 2009 by dvdxplayer 5,965 views |1 Comments

Surround sound encompases a range of techniques for enriching the sound reproduction quality of an audio source with audio channels reproduced via additional, discrete speakers. The three-dimensional (3D) sphere of human hearing can be virtually achieved with audio channels above and below the listener. To that end, the multichannel surround sound application encircles the audience (left-surround, right-surround, back-surround), as opposed to “screen channels” (center, [front] left, and [front] right), i.e. ca. 360° horizontal plane, 2D).

Surround sound technology is used in cinema and home theater systems, video game consoles, personal computers and other platforms. Commercial surround sound media include videocassettes, Video DVDs, and HDTV broadcasts encoded as Dolby Pro Logic, Dolby Digital, or DTS. Other commercial formats include the competing DVD-Audio (DVD-A) and Super Audio CD (SACD) formats, and MP3 Surround. Cinema 5.1 surround formats include Dolby Digital, DTS, and Sony Dynamic Digital Sound (SDDS).

Most surround sound recordings are created by film production companies or video game producers; however some consumer camcorders have such capability either built-in or available separately. Surround sound technologies can also be used in music to enable new methods of artistic expression. After the failure of quadraphonic audio in the 1970s, multichannel music has slowly been reintroduced since 1999 with the help of SACD and DVD-Audio formats. Some AV receivers, stereophonic systems, and computer soundcards contain integral digital signal processors and/or digital audio processors to simulate surround sound from a stereophonic source.

5.1 Channel Surround (3-2 Stereo) (analog magnetic: Dolby Stereo “Baby Boom”)

Delivers five audio channels and 1 LFE channel from a 6 channel source:

* Two channels for speakers at the front—left (L) and right (R).
* One channel for speaker at the center—center (C).
* Two channels for surround speakers at the rear—surround left (LS) and surround right (RS).
* One low-frequency effects channel (LFE).

[edit] 5.1 Channel Surround (3-2 Stereo) (digital discrete: Dolby Digital, DTS, SDDS, Penteo)
5 1 channels (surround sound) label.svg

Delivers Five discrete audio channels and 1 LFE channel from a 6 channel source:

* Two channels for speakers at the front—left (L) and right (R).
* One channel for speaker at the center—center (C).
* Two channels for surround speakers at the rear—surround left (LS) and surround right (RS).
* One low-frequency effects channel (LFE).
* Describes the Dolby Digital, Digital Theater System (DTS), and Sony Dynamic Digital Sound (SDDS) systems. Source media, usually DVD and sometimes Laser Disc or satellite/digital cable is often branded with “Dolby Digital” and/or DTS logos.
* Although DTS uses a higher data rate than Dolby Digital, this doesn’t mean that the fidelity is higher.

5.1 surround sound may also be referred to as 3-2 stereo. This defines the configuration that has been standardised for numerous surround sound applications. The term 3-2 refers to 3 front speakers and 2 rear speakers.[6]

Placement: 5.1 speaker layouts should conform to the ITU-R BS.775 standard, despite the myth that music and video content require different placements. The ITU standard states that the left and right speakers are located at ±30˚, while the rear speakers should be positioned approximately ±110˚. There is speculation that rear loudspeakers at ±150˚ provide “more exciting surround effects”.

7.1 Channel Surround (digital discrete: Dolby Digital Plus, DTS-HD Master Audio, Dolby TrueHD, SDDS)

Delivers seven audio channels and one LFE channel from an 8 channel source:

* Two channels for speakers at the front—left (L) and right (R).
* One channel for speaker at the center—center (C).
* Two channels for surround speakers at the sides—left surround (LS) and right surround (RS).
* Two channels for surround speakers at the rear—left back (LB) and right back (RB).
* One low-frequency effects channel (LFE).
* Describes the Dolby Digital Plus discrete Surround system. Source media, usually Blu-Ray and sometimes HD-DVD are often branded with “Dolby Digital Plus”, “DTS-HD Master Audio” and/or “Dolby TrueHD” logos.

7 1 channels (extended surround sound SDDS) label.svg

Layout variation for 7.1 widescreen cinema format:

* Four channels for speakers at the front—left (L), center-left (CL), center-right (CR) and right (R).
* One channel for speaker at the center—center (C).
* Two channels for surround speakers at the rear—surround left (LS) and surround right (RS).
* One low-frequency effects channel (LFE).

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