| Surround sound is the concept of expanding
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| | delivers 5.1 channels of "master quality"
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| the spatial imaging of audio playback from
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| | audio on CD, CD-R, and DVD. Each DTS
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| 1 dimension (mono/Left-Right) to two or
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| | encoded disc represents a sonic "clone" of
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| three dimensions. It is often employed for
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| | the original film soundtrack.
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| a more realistic audio environment,
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| | The difference between Dolby Digital
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| actively implemented in cinema sound
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| | (AC-3) and DTS is:
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| systems, technical theatre, home
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| | -DTS provides a deeper and tighter low
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| entertainment, video arcades, computer
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| | frequency presence
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| gaming, and a growing number of other
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| | -DTS allows the sound to breath -
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| applications. Many popular surround sound
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| | transparency
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| formats have evolved over the years. They
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| | -AC-3 leaves the impression that something
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| include ambisonics, quadraphonic, Dolby
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| | is missing from the mix
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| 5.1 Surround sound, DTS, and MP3 Surround.
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| | -At lower bit-rate AC-3 starts to sound
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| Surround sound can be created using
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| | like MP3's encoded at a low-quality 96kbps
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| several methods. The simplest to
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| | (artifacts)
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| understand uses several speakers around
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| | DTS is more three dimensional. The sound
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| the listener to play audio coming from
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| | actually moved forward from the individual
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| different directions. Another approach
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| | speakers to sound more full. This fullness
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| involves processing the audio using
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| | was most apparent with the music. Instead
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| psychoacoustic sound localization methods
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| | of simply coming from the speakers, the
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| to simulate a 3D sound field using
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| | DTS filled the front soundstage not only
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| headphones. The third approach, wave field
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| | side to side, but with more depth as well.
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| synthesis, uses a very large number of
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| | Bass reproduction was also more defined in
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| speakers to generate the "audio hologram"
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| | the DTS version, leaving the DD edition
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| of the original audio in the whole room
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| | sounding muddy.
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| (as of 2004 the only commercial
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| | Dolby Digital incorporates dialog
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| implementation of this is Iosono).
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| | normalization, which alters the decoded
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| Surround sound is not limited to placement
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| | level of the soundtrack. The typical
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| of speakers along a flat (2-dimensional)
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| | setting reduces level by 4 dB; other
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| plane. Vertically-located audio sources
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| | reduction levels are possible. In most
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| can be considered.
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| | decoders, this leads to a reduction in
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| Dolby Digital (DD) uses the AC-3 file
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| | signal-to-noise and dynamic range.
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| format, which any Dolby Digital Decoder
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| | Dolby Digital also provides a "stereo down
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| can decode to produce 5.1 audio. Dolby
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| | mixing" feature as a substitute for a
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| Digital is the technical name for Dolby's
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| | dedicated stereo mix. However, many
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| multi-channel digital sound coding
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| | production engineers have admitted that
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| technique, more commonly referred to as
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| | they often have to modify the original 5.1
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| Dolby 5.1. A six-channel sound coding
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| | mixes in order to attain acceptable stereo
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| process originally created by Dolby for
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| | down mixes. Therefore, the 5.1 mix on many
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| theaters, AC-3 was subsequently adapted
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| | Dolby Digital DVDs may differ from the
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| for home use and is now steadily becoming
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| | original master.
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| the most common sound format for DVD.
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| | 5.1 Surround Sound Headphones:
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| Six discrete audio channels:
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| | While the traditional method of surround
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| -3 for speakers at the front - left (L),
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| | sound described above uses numerous
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| center (C), and right (R)
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| | speakers to produce the entire sound
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| -2 for surround speakers at the side or
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| | field, the surround sound mix is limited
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| rear - surround left (SL) and surround
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| | to a two-channel stereo mix when using
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| right (SR)
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| | headphones. That is why recent
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| -1 low-frequency effects (LFE) channel
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| | developments in surround sound technology
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| carries supporting deep bass sound
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| | include 5.1 surround sound headphones, to
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| effects, ranging from 10 Hz to 120 Hz,
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| | allow you to have the same sound quality
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| which can for example be used by a
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| | and surround sound experience without
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| subwoofer. (This is the '.1' in '5.1'.)
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| | waking the neighbors or disturbing
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| DTS is an encode/decode process that
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| | roommates.
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