Microsoft released spatial audio for Teams to improve communication and reduce meeting fatigue in audio and video conferences. Spatial audio aims to mimic an in-person conversation by spatially separating the voices of individual meeting participants, which results in a more natural listening experience.
Creating realistic and engaging audio and video experiences that simulate dynamic real-world scenarios comes with challenges. For example, we rely on binaural hearing (that is, we use both ears) to help identify and distinguish the sources of sounds in the physical world. However, most audio and video communication applications today provide monophonic audio where speech signals from different participants are transmitted in a single audio channel, thus stripping away valuable spatial context our minds may be anticipating.
Teams Spatial Audio aligns the perceived audio location of each participant with their video representation to make it easier for users to track who is speaking, to understand better when multiple speakers are speaking at the same time, and to lower meeting fatigue and cognitive load. The following demo showcases the difference spatial audio can make (a stereo headset provides the best experience):
If you’re curious about the science behind the benefits of binaural hearing, dive into the well-known study of the “Cocktail Party Effect” [1] that outlines the brain’s ability to focus auditory attention on a single speech stimulus while filtering other sources of sound. The TLDR version is that two ears (and separate channels) help the listener process speech significantly more efficiently compared to using a single channel. Subsequent studies have shown that separating participants spatially can reduce the effect of sounds “masking” each other and may ultimately improve listener comprehension and memory [2]. Recent research shows video conferences with participants listening via loudspeakers and attendees listening through headsets prefer different levels of spatial separation with attendees listening through loudspeakers preferring greater “horizonal separation” than users listening through headsets [3].
Teams Spatial Audio is generally available on desktop applications and can be enabled by going to settings -> Devices to turn on spatial audio. Please note that you will need a stereo-capable device such as wired headsets or stereo-capable laptops. Bluetooth devices are currently not supported due to protocol limitation. Next generation LE Audio with stereo-enabled Bluetooth devices will be supported.
Try it out during your next meeting (or cocktail party) and discover how much easier it is to track who is speaking and to follow the flow of the conversation. While we cannot guarantee it will turn your next meeting into a posh event with fancy beverages and riveting small talk, we think you will find that Spatial Audio feels more natural and engaging.
Device support:
Infrastructure related:
Music mode:
Impact to Live Interpretation users:
[1]: Cherry, E. Colin. "Some experiments on the recognition of speech, with one and with two ears." The Journal of the acoustical society of America 25.5 (1953): 975-979.
[2]: . Litovsky, Ruth Y. "Spatial release from masking." Acoust. Today 8.2 (2012): 18-25
[3]: Jeremy Hyrkas et al., “Spatialized Audio and Hybrid Video Conferencing: Where Should Voices be Positioned for People in the Room and Remote Headset Users?”. CHI ’23, April 23–28, 2023, Hamburg, Germany
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