What that you must learn about Dolby Atmos sound


Dolby is a widely known firm within the cinema and residential theater area, concerned within the design of innovative applied sciences used on each the video and audio aspect and client tools. The corporate has step by step been extending its experience to cell with the adoption of HDR show specs, and has its Dolby Atmos audio expertise inside just a few handsets too.

Though on no account universally adopted, Dolby Atmos is out there in a rising variety of handsets throughout value factors. The expertise additionally seems to be coming to Samsung’s Galaxy S8 and S8 Plus flagships through a future software update. If you happen to’re questioning what all of the fuss is about then you definitely’re in the fitting place.

What Dolby Atmos does

Atmos is Dolby’s newest surround-sound audio expertise. It expands on the extra acquainted 5.1 and seven.1 sound codecs. Amtos differs by offering not solely sound within the x and y axes, but in addition within the 3D airplane z axis, with the introduction of variable peak for sounds. Its tackle channel encoding doesn’t pre-mix audio for a selected setup, as a substitute it takes an object-based strategy to saving audio information which is combined collectively proper earlier than the sound comes out of your audio system. Dolby calls Atmos “essentially the most important growth in cinema audio since surround-sound.”

Atmos introduces a brand new peak variable to conventional sound and modifications the best way Dolby encodes audio channels.

Atmos was primarily designed for cinema and high-end house installations, enabling house and industrial theatres to put in audio system within the ceiling for an extra peak variable. It additionally will increase the utmost variety of supported audio system in a system as much as 64. Though within the house Dolby recommends simply including two or 4 reflective or ceiling put in audio system to your present 5.1 or 7.1 setup, it helps as much as 34 audio system in whole.

In cinemas, the Dolby Atmos format permits for as much as 128 tracks and audio objects, full with spatial metadata, combined in-house on highly effective to match the precise cinema speaker setup, making certain extremely correct sound placement. In different phrases the format is speaker-setup agnostic.


Within the house theater and cell variations, audio is encoded alongside spatial data into Dolby TrueHD or Digital Plus codecs. These codecs historically help as much as 15 or 16 audio channels, however Dolby is utilizing a brand new encoding methodology that doesn’t break up the info into pre-mixed channels. As a substitute it’s a spatially-encoded digital signal with panning metadata. This audio is then combined collectively for any Atmos surround-sound setup in your house on the AV receiver or in your smartphone’s processor, whereas nonetheless reproducing the sound accuracy you’d hear within the cinema.

The final piece of the puzzle is support on the content side. The format requires content to be specifically mastered for it, so it’s far from universal. Fortunately hundreds of Hollywood blockbusters have been produced in Atmos, going all the way back to 2012. The format is supported on regular and Ultra HD Blu-ray discs, and streaming services Hulu Plus, VUDU, and Netflix additionally provide some Atmos titles.

After all, smartphones don’t have entry to a number of speaker placements. You’re fortunate in case your cellphone has two entrance going through audio system. As a substitute, Dolby Atmos for smartphones is a software-based answer that kicks in when enjoying again content material over headphones. The cell model goals to emulate the 3D audio impact you get with a typical surround-sound system.

3D Sound Labs Manipulating a spread of frequency and time based mostly audio cues is the important thing to simulating sound by headphones.

How Dolby does it

This isn’t a brand new concept. 3D spatial modeling for stereo headphones has been round of some time now. It’s based mostly on plenty of acoustic cues and heat-related switch capabilities, which basically reverse engineer the best way human listening to works to recreate sounds in what looks like a 3D area.

Think about what occurs whenever you sit in the course of a surround-sound system. Higher but, think about if you happen to had been really sitting in the course of a movie scene. When a sound leaves a selected supply, say an explosion, it takes time to achieve our ears. If the sound is on one aspect of you, the identical sound would take a bit bit longer to achieve your different ear, which means there’s a slight time or section distinction between your ears, which your mind detects. The sound would additionally should journey by your cranium, appearing as a filter for increased frequencies. The form of your outer ear (pinna) additionally acts as a resonance filter, serving to your mind decide the route and peak of sounds round you.

In smartphones, Dolby Atmos is a software program expertise that mixes and filters multi-channel audio on your stereo headphones. It retains a 3D sounding expertise by utilizing binaural audio strategies.

Subconsciously, your mind is extremely adept at selecting up on these invisible cues. By modeling these phenomena in software program for playback over headphones, it’s attainable to trick your mind into believing sounds are coming from any route, even when the audio system (headphones) are proper subsequent to your ears. For proof, take a look at one of many myriad spectacular binaural audio clips obtainable on YouTube.

A top-notch surround-sound emulator additionally takes how a number of sound sources work together with one another in area earlier than they attain our ears into consideration. Delicate reflections and echo may also help inform us concerning the distance of a supply and the scale and texture of an area. A number of sounds will bear section cancellation once they meet in area, quieter sounds could also be masked by louder ones, and excessive frequencies turn into dampened over longer distances. All of this needs to be calculated and combined down from a 5.1, 7.1, or Atmos format right into a stereo sign.

Which telephones help it?

Dolby Atmos isn’t very extensively supported but, however further adoption is probably going. In response to Dolby’s website, simply 4 smartphones at present help Dolby Atmos expertise. A leaked replace suggests help for the Samsung Galaxy S8 and S8 Plus is on the best way too, and Samsung may additionally embrace the characteristic out of the field in its next-generation flagships.

Right here’s the complete record of supported gadgets in line with Dolby’s web site. Remember the fact that there could also be just a few others on the market that aren’t listed:

Atmos isn’t the one Dolby audio expertise yow will discover in smartphones although. A variety of handsets additionally boast the corporate’s Digital Plus 5.1 surround-sound setup and different audio applied sciences too. Digital Plus expertise is predicated on very comparable psychoacoustic notion fashions for spatial audio, however doesn’t help Atmos’ new z-axis peak characteristic. The Razer Cellphone is the primary cellphone to help each HDR and Dolby Digital Plus content from Netflix. Different telephones sporting Dolby Audio in some kind embrace plenty of ZTE smartphones, the LG G6, and any HTC cellphone that includes BoomSound. There are in all probability just a few extra on the market, however documentation of those options is fairly inconsistent.

If you happen to’re huge on watching motion pictures in your cellphone, looking down one of many few handsets with Atmos help could be definitely worth the effort, supplied you possibly can stream appropriate content material. Bear in mind, this expertise solely advantages movie and TV. A smartphone with Dolby Atmos expertise may very well be the right companion to your high-end house cinema system when on the transfer. Hopefully we’ll see extra smartphones sporting the expertise all through 2018.


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