Object-basedAudioforHomeTheaterSystems
andVideoGamesPresentedtothe
IEEECentralTexasConsultantsNetworkby
SergioLiberman2016-06-22
Abstract
Home theater systems have seen great advanced invideo quality with 4K resolution, 3D and highdynamic range with the recently introduced UltraHD and Dolby VisionTM.The correspondent advances for the soundtrackuses object-based audio technology to offer 3D-likesound fields. This presentation will discuss DolbyAtmos® and DTS:X® object-based audio, and theapplications for home theater, video games andmobile.
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Object-BasedAudio
ObjectvsChannelBasedAudio
• Channel-basedaudioformatisfundamentallylimitedbecauseitiscreatedtoplaybackonaspecificspeakerarrayconfiguration.Expandingthesystembyaddingmorespeakersdonotresultinbetteraudiofield.
• Ifamovieismixedfora5.1speakerconfiguration,ithasjusttheinformationrequiredtoplaybacktofivespeakers,setinpredefinedlocations,andonesubwoofer.Thereisnoinformationforadditionalspeakers.Thespeakerpositionsarerigidlydefined.
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ObjectvsChannelBasedAudio
• Objectbasedaudioisnotlockedtoacertainnumberofspeakers.Instead,theaudiodatacarriesadditionalinformationabouttheaudioobjectstoallowthefinalaudiorenderingtooccurattheprocessorinthelivingroom,usingtheparticularspeakerconfiguration.
• InDolbyAtmosandDTS:X,eachsoundinamoviescene—agunshotorascream,forinstance—canbeanobject.Filmmakerscanpreciselyspecifywherethosesoundobjectsshouldappearinthe3Dacousticspaceandhowtheyshouldmovearound.
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Object-basedAudioCodecs
• Dolby Atmos• DTS:X• Auro 3D• MPEG-H
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3DAudioinHomeTheater
DOLBYATMOS®FEELEVERYDIMENSIONTM
“DolbyAtmostransportsyouintothestorywithmovingaudiothatflowsallaroundyouwith
breathtakingrealism.”
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DTS:X®EXPERIENCEDTS:X
“DTS:X places sound where it would occurnaturally in space, creating the most lifelike,multi-dimensional audio experience ever. Beprepared — this improved immersion andheightened realism makes horror movies scarier,comedies more laugh-out-loud, and car chasescenes even more intense.”
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EvolutionofHomeTheaterAudio(Dolby)
• Mono: one Front speaker (C)• Stereo: two Front speakers (L, R)• Dolby Prologic: three Front speakers (L, C, R), plus rear
surround.• Dolby Digital 5.1 surround sound - Front speakers (L, C, R)
and Surround speakers (LS and RS), plus effects channel.• Dolby Surround 7.1 - Front speakers (L, C, R), Surround
speakers (LS and RS), Rear Surround (RLS and RRS), pluseffects channel. May get to 9.1 with the addition of twofront height speakers.
• Dolby Atmos – builds on top of Dolby Surround 7.1, addingoverhead speakers, from 5.1.2 up to 9.1.2 speakerconfigurations.
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DolbyAtmosandDTS:XChannelandObjectAudioHybrids
• Dolby Atmos adds object based audio tochannel based Dolby Digital Plus. Assumesspecific speaker arrays to reduce complexity.
• DTS:X also adds object based audio to DTSchannel audio streams. However, DTS:X allowsarbitrary speaker array configurations formore flexibility.
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5.1SpeakerArray
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5.1.2AtmosCeilingSpeakerArray
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5.1.2AtmosEnabledSpeakerArray
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9.1SpeakerArray
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9.1.2AtmosSpeakerArray
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YamahaYSP-5600DolbyAtmosEnabledSoundBar
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WhatequipmentisrequiredforDolbyAtmosandDTS:Xplayback?
• Blu-rayplayer– existingBlu-rayplayersarecompatible.
• Soundbar– mustbeequippedwithDolbyAtmosand/orDTS:Xdecoders,andtheadditionalheightspeakers.
• A/VReceiver– mustbeequippedwithDolbyAtmosand/orDTS:Xdecoders.
• Speakers:additionalheightspeakersorDolbyAtmosEnabledspeakersarerequired.
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DolbyAtmosandDTS:XBlu-RayDiscs
• DolbyAtmos:– http://www.dolby.com/us/en/experience/dolby-atmos/bluray-and-streaming.html
• DTS:X:– http://dts.com/dtsx
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Formoreinformation
• http://dts.com/dtsx• http://www.dolby.com/us/en/brands/dolby-atmos.html
DolbyAtmosatthemovietheater:• http://www.dolby.com/us/en/experience/dolby-
atmos/movies.htmlDolbyAtmosmovietheatersintheAustinarea:• EVOEntertainmentCenter,3200KyleCrossing,KyleTX78640• Santikos MayanPalace,1918S.W.MilitaryDrive,SanAntonio
TX78221
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3DAudioinGames
3DAudioinGames• Object-basedaudioofferstheflexibilityrequiredforsound
eventsingames.• Beingfreeoftherestrictionsofchannel-basedaudioallows
precisepositioningoftheaudioeventsinthe3Dacousticspace,tailoredtotheend-pointspeakerorheadphonesystemconfiguration.
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3DAudioinGames“Avideogame'saudiosceneismadeupofmanyindependentaudioobjects,liketheenginesofashipflyingaboveyouorweaponsfiringattargetspastyourhead.Traditionalaudiotechnologiesrequiregamesounddesignerstoflattenthethree-dimensionalaudiointoatwo-dimensionalplane,losingvaluablepositioninginformationintheprocess.ButDolbyAtmosremovesthisbarrier.Forthefirsttime,thethree-dimensionalaudiosceneispreserved,soyou'rerightinthemiddleoftheaction.Now,notonlycanyoucanheartheenemyinfrontandbehindyou,butaboveyouaswell—givingyouacompetitiveadvantage.”
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StarWarsBattlefrontwithDolbyAtmos
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3DAudioinHeadphones
Head-relatedTransferFunction
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3DAudioinHeadphones• Ahead-relatedtransferfunction(HRTF)isaresponsethatcharacterizeshowanearreceivesasoundfromapointinspace;apairofHRTFsfortwoearscanbeusedtosynthesizeabinauralsoundthatseemstocomefromaparticularpointinspace.
• Humanshavejusttwoears,butcanlocatesoundsinthreedimensions– inrange(distance),indirectionaboveandbelow,infrontandtotherear,aswellastoeitherside.Thisispossiblebecausethebrain,innerearandtheexternalears(pinna)worktogethertomakeinferencesaboutlocation.
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3DAudioinHeadphones• DolbyHeadphone• DTSHeadphone:X• SmythRealiser
TheRealiserprovidesanexperienceinwhichmultichannel(orstereo)recordingsoundsareindistinguishablythroughheadphonesasitdoesthroughaloudspeakerarrayinarealroom.TheRealiserappliesHRTFstomultichannelsoundtodrivetheheadphones.TheRealiseremploysthreecriticalcomponentsnotseenintheotherproducts:
• personalization• headtracking• thecaptureofthepropertiesofanyreallisteningspaceand
soundsystem.
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SignalProcessingPlatformsforDevelopmentand
Implementation
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MomentumDataSystemsEQ1• DevelopmentplatformforDolbyAtmosandDTS:X• UsesstandardDA8xxTItools(CCS,PA,Linux,etc.)• MultiDSPsystem:
– ThreeTIDSPchips:DA830+2xDA808– ARM926+3xC647xDSPcores@456MHz– 12-channelanalogin,24-channelanalogout.– HDMII/O
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MDSEQ1BlockDiagram
MDSAPM-89L
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• APM-89LprocessormoduleforDolbyAtmosandDTS:Xdecoding
• TwoDSPchips:DA830+DA810
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MDSEVMD• DolbyAtmosandDTS:XdemoplatformfortheAPM-89Lprocessormodule.
• 8-channelanalogin,16-channelanalogout.• HDMII/O
ThankYou
Myname:SergioLibermanMyemail:[email protected]
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