Spatial Audio with UWB: The Next Frontier for Earphones, Headsets and Extended Reality

  • November 10, 2021



In previous blog posts we’ve highlighted some of the hot applications targeted with ultra-wideband (UWB) short-range wireless connectivity – wireless audio earphones, gaming headsets, AR/VR devices, smart glasses, positioning and tracking, to name a few.

What do all of these devices have in common? They’re all core enabling technologies for Extended Reality (XR), a superset of Augmented Reality (AR), Virtual Reality (VR) and Mixed Reality (MR).

These technologies point to a future where XR is ubiquitous in our lives, which explains why our top innovators are pushing so hard at cracking the code that finally unlocks XR for mass commercial consumption. Analysts have projected that XR could deliver a $1.5 trillion boost to the global economy by 2030, observing that “XR technology can benefit virtually all industries.”

XR is big business built atop breakthrough technology, intended to harness all of our senses to deliver ultra-immersive experiences like we’ve never experienced before. Fully realized, XR incorporates our sensory abilities for touch, sight and sound. All three senses must be accounted for, but for the purpose of this blog, we’d like to deep dive on the topic of sound.


Audio quality and clarity is of course a paramount concern when it comes to XR, and UWB is orders of magnitude better performing than Bluetooth since there’s no need to compress the audio signal with UWB. For sound quality, UWB is vastly superior to Bluetooth because it enables 10X more data throughput.

But there’s another crucial advantage that UWB brings to the table when it comes to audio, and it’s massively important to the future of XR: spatial audio.

We’ve been hearing more and more about spatial audio in one form or another in recent years, and it means different things to different people depending on the application.

For movie and TV entertainment, spatial audio has largely manifested as ‘surround sound’ techniques that bring dynamic depth – and height – to the soundscape for a more lifelike audio experience. It’s an approach used in film sound mixing in recent years, perhaps most notably with Dolby Atmos, which in turn has been licensed for use in Apple’s debut spatial audio offering.

In the world of gaming, spatial audio allows gamers to pinpoint enemies and other game elements from all sides and react to them faster. Spatial audio can vastly improve gameplay performance by ensuring that crucial, positional audio cues are readily perceptible.

For music listeners, the benefits of spatial audio-equipped earphones are like the difference between 2D and 3D video in that it adds an entirely new dimension. You really need to hear it for yourself to fully grasp the transformation. Rather than being limited to discrete channels – like a left and right channel, as with stereo – sound is projected and moved around a 3D audio space. It’s simulating more depth and width within the sound mix for musicians and sound engineers to work their magic.

For AR/VR devices and smart glasses, spatial audio can be used to make virtual objects sound like they’re right next to us in the real world, with implications for a wide range of assistive applications. The specific location of the sound provides hugely valuable guidance in the form of prompts and cues that guide us on our way and/or alert us to objects and activities around us.


For all of these applications – aside from the entertainment value – audio is essential to establishing spatial positioning, relative orientation and other cues. It plays a major part in helping users establish situational awareness, and that’s precisely why it’s so important to XR applications going forward. We can’t freely move about in the virtual environments of the future in an informed way if we can’t sense depth in every direction. Spatial audio gives us this ability.

SPARK’s UWB technology enables the extreme data throughput that’s perfect to not only stream high quality, uncompressed audio but also stream inertial measurement unit (IMU) data at low latency to allow these spatial audio algorithms to work their magic. Because this rich sensor data can now be transmitted at such low latency with UWB, this could also shift the processing burden from the earphones to the source/dongle, opening the door to increased power savings for wireless earphones going forward. This approach could also accommodate more complex algorithms running on the source/dongle, enabling much longer usage between recharges and even better spatialization.

Credit picture: Pixabay