DTS Multi-Dimensional Audio Demoed .. For Real
Several companies are pushing the idea of surround-sound systems with more than 7.1 channels of sound, otherwise known as immersive audio. Behind the scenes in the movie production community, a consortium of pro audio companies, coordinated largely by Dolby competitor DTS, has been pushing a different idea: Multi-Dimensional Audio, or MDA.
DTS conducted demos in a specially outfitted theater in the Los Angeles area.
MDA: How It Works
Home Theater Expert Robert Silva has already explained MDA in-depth, but here are the basics.
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With a 7.1-channel system in a home theater or commercial cinema, you have front left, center and right speakers, two side surround speakers, two rear surround speakers, and one or more subwoofers. Some audio/video receivers can kick this up to 9.1 or 11.1 by adding front height speakers and/or an extra pair of speakers between the front left/right and side surround speakers, using either Dolby Pro Logic IIz, Audyssey DSX or DTS Neo:X processing to derive the extra channels.
Immersive systems take this a step further by adding speakers on the ceiling to provide more enveloping and realistic surround effects. They can also add more speakers to the front left, center and right speakers already behind the screen, and extra surround speakers in arrays positioned above the existing arrays. These speakers may be set up so they can be addressed individually so that a sound effect can be isolated to one specific speaker. A panning effect can travel smoothly and consistently around the theater, moving among, say, 16 or 20 separate surround speakers instead of among four groups of speakers as in 7.1.
Dolby Atmos is, in essence, a bunch of extra channels grafted onto a conventional 7.1 system. The speakers can be addressed in groups as in 7.1, or individually for more immersive effects, and there are also two rows of ceiling speakers added.
John Kellogg, DTS senior director of corporate strategy and development pointed out:
We're not suggesting you need all these speakers for immersive cinema. This installation was really put together as a lab so we can test and demonstrate many combinations of speakers. This installation includes speaker configurations that currently exist in cinemas and ones coming in the future. But of course using them all is really fun.
The key technical difference with MDA is more a way of thinking about the mix and the audio sound field.
MDA is what's called an 'object-based' audio system. Each bit of dialogue, each sound effect, each snippet of soundtrack music and even each instrument in a soundtrack mix, is considered to be an audio “object”.
Rather than recording sounds onto a specific channel or group of channels -- a two-channel stereo recording, or a 5.1- or 7.1-channel multichannel soundtrack, for example -- they are all exported as part of an MDA file. The file includes metadata that assigns a certain coordinate or physical position to each sound or audio object; plus the time at which the sound appears and the volume at which it plays.
'The speakers become more like pixels than like channels,' Kellogg said.
MDA can 'map' these vectors to any array of speakers, from dozens of speakers in a commercial cinema to as few as two in, say, a TV set. When an MDA system is installed, a technician feeds information about the speaker locations in that particular room into the system and the rendering software figures out how to use the array to best reproduce each sound.
From a business standpoint, MDA is also very different from Atmos. The Atmos system and program is proprietary and governed by Dolby. MDA, in contrast, is an open format, reflecting a collaboration among cinema industry companies including DTS, QSC, Doremi, USL (Ultra-Stereo Laboratories), Auro Technologies and Barco, and a few studios and exhibitors.
MDA: The Gear
QSC cinema sales engineer Paul Brink was on hand to take me through the whole signal chain up in the projection booth of the specially equipped theater. The core of the system is a QSC Q-Sys Core 500i digital signal processor, which has the capability to handle as many as 128 inputs and 128 outputs.
The Core 500i takes digital audio and metadata from the Doremi server used to play the movie from the hard drives supplied by the movie studios. The Core 500i connected to 27 QSC DCA-1622 amplifiers through five Q-Sys I/O Frames, which are essentially networked digital-to-analog converters.
This system powers 48 channels of sound plus a subwoofer channel feeding seven subwoofers. The array in the theater included:
- Left, center and right speakers behind the screen
- Left, center and right height speakers above the screen
- Three rows of ceiling speakers running front to back
- Surround speakers running all around the side and back walls
- A second higher array of surround speakers on each side wall positioned about 6 feet above the main array.
The cost of such an array can be high, and installation -- especially of the ceiling speakers -- expensive. Kellogg explained:
Scaffolds had to be erected and taken down 15 separate times to mount the ceiling speakers up there, but it doesn't have to be that complicated. It can be whatever the theater can afford. In a theater where it's not practical to put in full ceiling arrays, we usually recommend two near the front, two near the back, and one in the center of the ceiling. We find that's critical for giving you that 'voice of God' effect.
MDA: The Experience
The material for the demo was the 10-minute sci-fi short Telescope, which you can see on the movie's own site or watch on YouTube.
For the demo, a special MDA mix had been created, with the sound effects existing as vectored objects and the QSC Core 500i deciding which speaker or speakers to route the sound objects into.
The mix sounded good on all of the various arrays, even the 7.1, and the fundamental character of the sound didn't change. What changed was the sense of envelopment. Just as direct comparisons with 5.1 and 7.1 reveal the limitations of stereo, direct comparisons of MDA with the other configurations revealed their limitations.
Telescope takes place entirely in the cabin of a tiny spaceship, and this, surprisingly, showed off MDA to full effect. When the ship isn't warping off through space, the sound effects are mostly little bleeps and bloops and hums from all the machinery around the cabin.
MDA sounds like the most advanced thing going in sound, but it's likely that the sound effects were mixed to show off MDA. It's up to the mixing engineers to make use of this extra capability. For MDA to have a sonic advantage in real-world applications, the mixing engineers will have to have the time, budget and desire to create mixes that exploit its capabilities.
What's this mean for home audio systems? As of 2014, there's no plan for that yet, at least not one DTS is willing to discuss, but with rumors flying about a launch of Atmos-capable A/V receivers, it's hard to imagine DTS doesn't have the home market in mind.
Speaker Setup 5.1 / 7.1
Speaker Setup 11.1 Auro 3D
Speaker Setup 5.1.2 & 5.1.4 Dolby Atmos
Speaker Setup 7.1.2 & 7.1.4 Dolby Atmos
AURO
Auro 3D
Auro-3D is an immersive 3D audio format. It is designed along three layers of sound (surround, height and overhead ceiling), building on the single horizontal layer used in the 5.1 sound format. Auro-3D creates a spatial sound field by adding a height layer around the audience on top of the traditional 2D surround sound system. This additional layer reveals both localized sounds and height reflections complementing the sounds that exist in the lower surround layer. The height information that is captured during recording is mixed into a standard 5.1 surround PCM carrier, and during playback the Auro-3D decoder extracts the originally recorded height channels from this stream.
DOLBY
Dolby Atmos
With Dolby Atmos, sound comes alive from all directions, including overhead. The format combines a channel-based audio bed with object-oriented sound to place and move specific effects around the theater, creating a breathtakingly realistic and captivating sonic atmosphere. Sound designers and artists are free to mix in a 3D space, steering effects through surround channels and adding a seamless overhead dimension with discrete height channels. In commercial theaters, it supports up to 128 audio tracks and 64 unique speaker feeds. The home theater adaptation automatically scales to your surround configuration.
Dolby TrueHD
Dolby TrueHD is Dolby’s latest lossless technology, the ultimate audio experience for high-definition disc-based media. Dolby TrueHD on Blu-ray Disc allows viewers to hear exactly what was captured during the recording and mastering process, bringing a palpable and involving audio presence to the home theater experience.
Dolby Digital Plus
Dolby Digital Plus is the next-generation audio format that delivers “better-than-DVD” sound in high-definition packaged media because it requires less compression and provides more channels (up to 7.1). Dolby Digital Plus also provides new coding efficiencies for future broadcasting and streaming of multichannel audio.
Dolby Digital EX
Dolby Digital EX introduces a center rear channel to 5.1-channel playback, expanding the surround sound experience to 6.1 channels. It intelligently identifies audio information in the left and right surround channels. One or two speakers placed behind the listener provide increased realism for front-to-back sounds and those originating from directly behind the listener.
Dolby Digital
Dolby Digital is a powerful audio format that provides up to 5.1 separate channels of crystal-clear digital surround sound, bringing entertainment to life. A worldwide standard in film, broadcast, and DVDs, Dolby Digital delivers unrivaled audio in a home theater subwoofer for an exciting, enveloping surround sound experience.
Dolby Digital Live
Dolby Digital Live converts any audio signal in real time from PCs or game consoles into Dolby Digital for easy connection to home theater systems through a single digital cable. Users can enjoy PC or game audio entertainment with exciting realism through home theater receivers or other devices equipped with Dolby Digital decoding technology.
Dolby Surround
Dolby Surround technology encodes four channels of audio (Left/Center/Right/Mono Surround) onto just two audio tracks for media such as TV broadcasts and feature films on VHS. On systems containing Dolby Pro Logic technology, the audio is reconstructed to its original four-channel surround sound.
Dolby Pro Logic
Dolby Pro Logic decodes Dolby Surround movie content into four playback channels of surround sound: Left, Center, Right, and Surround. Dolby Pro Logic II Dolby Pro Logic II creates a captivating surround sound experience from any stereo (two-channel) movie, music, TV, or game audio source. Listeners will hear all the detail and subtleties of the original stereo content, with the added luxury of full, compelling surround sound that makes the entertainment experience feel as if it’s happening all around the listener.
Dolby Pro Logic IIx
Dolby Pro Logic IIx creates a vivid 7.1-channel surround sound experience from any stereo (two-channel), 5.1, or 6.1 movie, music, TV, or game audio source. Dolby Pro Logic IIx examines the signal and uses that information to expand audio into up to 7.1 channels of highly realistic, natural surround sound.
Dolby Pro Logic IIz
Dolby Pro Logic IIz introduces a new dimension to home theater listening through the addition of front height channels, creating a 7.1 or 9.1 playback system that enhances the spaciousness of music, movies, and video games. The height information complements the sound from the surround speakers while honoring the original intent of the content creator.
Dolby Headphone
Dolby Headphone creates a personal surround sound experience using any set of headphones. The playback of music, movies, and games results in sound that is more spacious, open, and dramatic, improving listening comfort and making listeners feel as if the action is happening all around them.
Dolby Virtual Speaker
Dolby Virtual Speaker delivers a vibrant surround sound experience from any pair of stereo speakers, making it ideal for environments such as small living rooms, home offices, or bedrooms where multiple speakers are not practical.
DTS
DTS:X
DTS:X is the next generation object-based, multi-dimensional audio technology from DTS. Unbound from channels, DTS:X conveys the fluid movement of sound to create an incredibly rich, realistic and immersive soundscape – in front of, behind, beside and above the audience – more accurately than ever before. DTS:X offers the ability to automatically adapt the audio to the speaker layout that best fits the space, from a television’s built-in speakers to a home surround theater system to a dozen or more speakers in a commercial cinema. With DTS technology, even the smallest screens will sound huge.
DTS HD Master Audio
DTS-HD Master Audio is capable of delivering audio that is bit-for-bit identical to the studio master. DTS-HD Master Audio delivers audio at super-high variable bit rates 24.5 Mbps on Blu-ray Disc which is significantly higher than standard DVDs. This bit stream is so fast, and the transfer rate is so high, that it can deliver 7.1 audio channels at a sampling frequency of 24 bits identical to the original. With DTS-HD Master Audio, you will be able to experience movies and music exactly as the artist intended: clear, pure, and uncompromised.
Dolby 5.1 Surround Sound Test
DTS HD High Resolution Audio
DTS HD High Resolution Audio can deliver up to 7.1 channels of sound that is virtually indistinguishable from the original. DTS-HD High Resolution Audio delivers audio at high constant bit rates superior to standard DVDs—6.0 Mbps on Blu-ray iscs and 3.0 Mbps on HD-DVD to produce outstanding sound quality. It is capable of delivering up to 7.1 channels at 96k sampling frequency/24 bit depth resolution. It allows content creators to deliver rich, high definition audio on movies where disc space may not allow for DTS-HD Master Audio.
DTS
DTS Digital Surround is the standard for providing 5.1 channels of discrete digital audio in consumer electronics products and software content.
DTS-ES
DTS-ES is the only digital audio format capable of delivering 6.1 channels of discrete audio in the consumer electronics market. DTS-ES is also fully backwards-compatible with DTS decoders that are not Extended Surround equipped.
DTS Neo:6
DTS Neo:6 provides up to six channels of matrix decoding from stereo matrix material.
DTS 96/24
DTS 96/24 offers an unprecedented level of audio quality for multi-channel sound on DVD-Video, and is fully backward-compatible with all DTS decoders. “96” refers to a 96kHz sampling rate (compared to typical 48kHz sampling rate.) “24” refers to 24-bit word length.
DTS Surround Sensation – Ultra PC
DTS Surround Sensation – Ultra PC is the perfect audio solution for people that listen to music or watch movies on their computers, with just 2 speakers. Whether your audio source is stereo or surround sound, you can enjoy a virtual surround effect.
DTS Neural Surround
DTS Neural Surround is the bridge between stereo and 5.1 surround audio. Products with the DTS Neural Surround logo allow for seamless conversion between stereo and 5.1 audio through the capture, edit, management and broadcast process.
DTS Headphone:X
An innovative sound experience designed to make your movies, music and games sound better over your headphones. Headphone:X feels like you’re listening to high-quality speakers placed around and above you. Headphone:X has been designed to work with any set of headphones. All you have to do is plug in to experience entertainment exactly the way it was recorded in studio.
THX
THX Loudness Plus
THX Loudness Plus is a volume control technology featured in THX Ultra2 Plus and THX Select2 Plus Certified pre-amps, integrated systems and receivers. With THX Loudness Plus, home theater audiences can now experience the rich details and ambient sound in a surround mix at any volume level. Song download mp3 free.
THX Re-EQ
THX Re-EQ is a compensation technology taking soundtracks that are mixed for large cinemas, where speakers are placed farther away from you, and re-establishes the accurate tonal balance for your close range home theater speakers. Without THX Re-EQ, higher frequencies sound excessively “edgy” or “bright.” With THX Re-EQ, the movie soundtrack is true to the original immersive cinematic experience.
THX Timbre Matching
Due to location, the tonal quality of the perceived sound coming from the side surround speakers is changed in relationship to the sound coming from the front speakers. This is because the outer ear, called the pinna, contours the frequency response of a sound depending upon its direction. The result is two conflicting sound fields – a front and a surround. THX Timbre Matching technology solves this sound field problem by actually acting as an electronic pinna, restoring and integrating the perceived frequency match between the front and surround speakers. This technology allows you to be placed in the center of the onscreen action with smooth, rich surround sound.
THX Adaptive Decorrelation
Many movie soundtracks have a mono surround track – especially those recorded prior to 1993. If you are sitting closer to one surround speaker than the other, the sound collapses to the one side instead of accurately immersing you in the onscreen action. THX Adaptive Decorrelation subtly adjusts one surround channel’s time and phase relationship with respect to the other surround channel. With THX Adaptive Decorrelation the listening position is expanded, providing you with the same spacious audio experience as in a movie theater.
THX Ultra
THX Ultra Certified Products are engineered and designed for top performing products that are not dependent on a specific room size.
THX Ultra2
THX Ultra2 Certified Products are engineered and designed for large home theaters. Viewing distance of approximately 12 feet / 4 meters from the display to the listening position.
THX Select
THX Select Certified Products are engineered and designed for superior performance and complement the presentation of THX Select2 Certified Receivers.
THX Select2
THX Select2 Certified Products are engineered and designed for small to medium sized home theaters. Viewing distance of approximately 10 feet / 3 meters from the display to the listening position.
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How to Confirm 7.1 Sound to Headphones from PC?
Hi, I wanted to confirm my setup was correctly setup for 7.1 surround on my speaker headphones based on the following:
-Sennheiser HD 598
-Astro Mixamp 2014 Edition
-My PC with Mobo-Onboard Optical Port
I have my HD 598 headphones plugged into the mixamp. Mixamp is plugged into the PC via optical TOSlink cable (into mobo port for Optical). Note that it is also plugged in with a USB Cable for Power to the PC. I have selected Digital Audio (S/PDIF) in Win10 for the default sound (not the 'Speakers' option that is available from the USB connection, if I am understand this correctly)
Now couple of questions:
-How can I test for 7.1 surround? The mixamp is supposed to provide virtual 7.1 after receiving digital signal from computer and ultimately produce 7.1 for my HD 598s. I can't test via youtube because no videos properly output surround from youtube. Is there a go-to testing file/site?
-Is there anything wrong in my configuration? I thought I read something about needing a certain signal/encoding format sent from my computer to the mixamp in order for it to do it's 7.1 processing correctly to the headphones, an I'm unsure if my onboard audio from the MOBO is outputting the correct type of Dolby signal or w/e is required? (Does this mean I need a soundcard in addition to the mixamp?)
Thanks