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so 360 degree virtual reality movies
aren't quite mainstream yet i mean who wants to strap on the headset every time
there's another disappointing justice league movie but at least 360 degrees
surround sound has long been the mainstay of not just movie theaters but
home theaters as well where a typical setup will be a subwoofer or two for
bass and five or seven speakers surrounding the viewer to help the sound
well surround the viewer now traditionally the way this is worked is
that depending on the surround audio encoding scheme used by the publisher a
device called the receiver would decode and playback discrete audio tracks for
each speaker that would correspond to the action on the screen assuming a high
quality mix so the idea is that if you're looking at the scene featuring a conversation the
voices will probably be coming mostly out of the center channel while the
satellite speakers behind you focus on let's say ambient background noise this
one track for one speaker paradigm has been powering surround sound systems for
a long time and it's worked pretty well but we've increasingly seen a different
method of surround sound delivery both in theaters and on blu-ray that's
actually based around encoding sounds as objects instead of channels the
principle behind dolby atmos and dts x
but hold on a minute sounds as
objects okay so it means that instead of each audio track corresponding to only
one speaker the tracks are encoded with data that indicate some location in
space instead of a specific channel so let's say you're watching a scene where
a plane is flying overhead toward you instead of for example the tracks match
to the front speakers getting quieter and the tracks for the back speakers
getting louder as the plane passes by the plane's engines will instead be
encoded as a spot in space above you that moves around in real time now this
may not sound like too much of a difference but the idea here is that
atmos and dtsx scale very well
traditional surround setups had no way of knowing much more than distance from
your couch about the physical placement of the speakers in your room so results
can be very inconsistent from setup to setup but because atmos and dtsx allow
sounds to be coded with location data like above the listener halfway between
the screen of the chair and against the right hand wall rather than just right front speaker a
decoder compatible with these formats will then take this positional data and
the specific speaker configuration into account to produce sound that's more
accurately reflective of where it's supposed to be in space whether it has
five speakers propped up on two by fours around your computer to represent this
data or 50 professional grade loudspeakers in a large cinema and it
even includes support for sounds above you something traditional surround
doesn't offer atmos supports up to 118
objects and dtsx supports an unlimited number of objects and both technologies
can work with your conventional 5.1 and 7.1 speaker setups with atmos boasting
support for up to 34 speakers for home theater now that might sound excessive
and it probably is but more speakers will enhance the sense of space and
realism you'll get now as for those of you who aren't the type to install
speakers everywhere you can find an empty spot on your wall or ceiling there
are a number of upward firing speakers that reflect off of your ceiling to
simulate a real speaker above you and you can even upgrade your existing power
speakers just by plopping one designed to fire upward on top of them we checked
out a sound bar that uses this technique recently over on Linus tech tips and the
effect was fairly convincing of course like with any new standard not
everything is atmos or dtsx capable you'll need a compatible receiver though
the good news is that most receivers support both and some atmos or dtsx
encoded media fortunately the technology is becoming
more and more common on blu-rays streaming services and even game
consoles so maybe at some point we'll feature atmos support right here on
techwiki and envelop you in the velvety tones of my voice coming at you from 118
different angles no no takers at all all right
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