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Dolby Atmos creates an amazing mobile entertainment experience with breathtaking, moving audio—sound that flows all around you.
Dolby Atmos® transforms mobile entertainment. Over built-in speakers or headphones, sound seems to come from all directions, including overhead, with astonishing clarity, richness, power, and depth.
When you put on your headphones, the sounds of people, places, things, and music seem to move all around and above you, so you feel like you're inside the action.
It's sound that excites your senses and inspires your emotions to deliver the full impact of entertainment.
Dolby Atmos for mobile devices adapts the premier cinema sound experience for reproduction over built-in speakers and headphones to create powerful, moving audio that seems to flow all around you.
Sounds in Dolby Atmos soundtracks for cinema and home exist as individual entities, called audio objects. These audio objects move around you and above you to create a complete audio environment that perfectly follows the onscreen story to fully immerse you in the action.
Mobile devices use the same streaming-media Dolby Atmos soundtracks as do home theaters. The Dolby Atmos processor on the device takes the spatial information from the audio objects created for the cinema and renders them in virtual three-dimensional space over built-in speakers or headphones. It produces a sensation of movement and overhead sound that brings the story alive all around you.
Dolby Atmos for mobile devices works over any pair of headphones and is custom-tuned to get the most out of built-in stereo speakers. Not only does it deliver the best experience for Dolby Atmos content, it also greatly improves the sound of music, games, and television shows in any format on your device. It provides crisper dialogue, a more enveloping soundfield, greater subtlety and nuance, maximized loudness without distortion, and consistent playback volume for a wide variety of content.
With Dolby Atmos, any sound can be rendered as a single audio element, an object, independent from the rest of the soundtrack. A child yelling, a helicopter taking off, a blaring car horn—the filmmaker can decide exactly where the sound should originate and where it should move as the scene develops.
Audio objects allow filmmakers to concentrate on the story. For channel-based audio, filmmakers can only approximate a sound's desired location and cannot isolate individual sounds. With Dolby Atmos, filmmakers choose precisely where the sound should be located, and the system intelligently makes the speaker-assignment decisions based on the speaker array in the theatre or home. Audio objects originate and move anywhere in three-dimensional space, including anywhere overhead.
While cinema and home theater systems have multiple channels, the headphones and built-in speakers of mobile devices are two-channel stereo. To create the Dolby Atmos experience for mobile users, Dolby scientists drew on their extensive research and expertise in psychoacoustics, the study of how we perceive sound.
Creating a realistic perception of height and surround sound two-channel mobile systems begins with head-related transfer functions (HRTFs). HRTFs describe how incoming sounds located at different positions around us arrive at our ears.
Depending on where a sound originates, it may arrive at one ear very slightly later than at the other, and it may have slightly different characteristics at each ear (such as being softer or less distinct). The differences are caused by interference from the listener's head, torso, and external ears. The brain instantly processes these differences as spatial information, enabling us to hear in three dimensions. HRTFs represent these same differences mathematically.
A streaming-media Dolby Atmos mix supports up to 128 simultaneous audio objects and includes metadata that describes the location of each one in space. The Dolby Atmos processor on a mobile device applies our extensive sets of HRTFs to this metadata to recreate the spatial information in a stereo signal. Heard over any headphones or earbuds, this stereo soundtrack accurately simulates the theatrical sound, including sounds from above, for a powerful and spacious experience.
To reproduce this same experience over a device's built-in speakers requires additional processing. Speakers generate a natural "crosstalk" phenomenon at our ears that works against simulating multiple channels. The Dolby Atmos processor cancels this crosstalk and then applies the HRTFs to create the dimensional soundstage and movement of the audio objects.
As an added benefit—and bit of magic—the Dolby Atmos processor delivers all this with minimal effect on battery life.
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