The document discusses spatial audio and its role in virtual reality. Spatial audio uses techniques like microphone arrays and head-related transfer functions to simulate the way humans perceive sound spatially. This allows sounds to be positioned in 3D space. In VR, spatial audio is important as it provides audio cues that guide user attention and improve immersion. Without it, the illusion of presence in a virtual world breaks down. The document outlines the history and technology behind spatial audio, as well as applications in VR, AR, and hearing devices. It argues spatial audio will be increasingly important with future VR and AR applications.

1. ACADEMY OF TECHNOLOGY
PRESENTATION ON SPATIAL
AUDIO
PAPER CODE : EC-681
Submitted by:- Arnab
Banerjee(19)
Atrija Singh(24)
Guided by:
Prof. NUPUR
CHHAULE

2. SOUND AN IMPORTANT PART OF HUMAN
LIFE
• Communication
• Sense Making
• Perception
• Pleasure
• etc……

3. HUMAN AUDITORY PROCESSING
• Captures
• Analyze
• Process
In Spatial Audio , sound is usually created by relative
compact sources that occupy a small region.

4. DISCRETE TIME SIGNAL
PROCESSING
• Location
• Direction
• Ambience
Effective Method:
• Microphone Array
• Head Related Transfer Function (HRTF)

5. WHAT IS SPATIAL
AUDIO ?

6. SPATIAL AUDIO HISTORY
• Stereo Recordings -- able to pan a phantom source
between two speakers
• 5.1 audio -- horizontally pan a source
• 7.1 audio -- provides more elevation
• Virtual Reality (VR) era – ambisonics, provides
true audio immersion . Simulate real world acoustics in VR.

7. SPATIAL AUDIO ROLE IN VR
Examples :
• If someone calls us, we immediately know where to look
• If a train passes by we can feel from which direction it passes
Reason :
• Directional perception

8. THEORY
• How Spatial Audio Works in VR
In VR user is put into the middle of the action and he might not even know where to look.
Spatial Audio provides a powerful tool to control user attention by providing spatial audio queues from the
direction of interest that a user can be guided through Virtual Reality
• What will Happen if Spatial Audio is not provided in VR
The illusion of being in a different world immediately breaks as soon as there is a mismatch between our senses.
Particularly the lack of spatial audio immediately breaks in the VR immersion

9. SPATIAL AUDIO IN REAL WORLD
• Time Difference
https://developers.google.com/vr/concepts/spatial-audio
• At higher frequencies , λ< d

10. SOUND FROM DIFFERENT
LOCATIONS
https://developers.google.com/vr/concepts/spatial-audio

11. SPATIALIZING SOUND IN VR
https://developers.google.com/vr/concepts/spatial-audio

12. APPLICATIONS
• Virtual and Augmented Reality Games
• Recording of Live Concert to give the viewers the
virtual feeling of being present at the concert
• Hearing devices for patients , to make them feel the
current situation where they are present.

13. ADVANTAGES
• Virtual and Augmented Reality Games
• 360o videos
• Movies
• Animations
• Recording of Live Concert to give the viewers the
virtual feeling of being present at the concert
• Hearing devices for patients, to make them feel
the current situation where they are present.

14. DISADVANTAGE
• Costly and complex to design
• Needs precise algorithms and calculations
• complex structure of microphone array

15. FUTURE SCOPES
• Spatial Audio is an emerging trend
• Many researches are being carried out
• VR and AR have most of its applications
• This can be further implemented in medical devices
• Spatial Audio can also be used as a tool for Medical
Students
• Most of Future Games will have this
• This will further provide more and more immersion in
sound technology with the user

16. CONCLUSION
• Spatial Audio is a very emerging technology in the
current era.
• Applying spatial audio in many day to day life devices
will change the scenario of viewing the world.
• The addition of Spatial Audio in AR and VR in most
devices will have a great positive impact in human life.

18. REFERENCES
• https://en.wikipedia.org/wiki/Ambisonics
• https://www.microsoft.com/en-us/research/project/spatial-audio/
• https://en.wikipedia.org/wiki/Head-related_transfer_function
• http://www.spatialaudio.us/
• https://en.wikipedia.org/wiki/Virtual_reality
• https://en.wikipedia.org/wiki/Microphone_array
• https://www.youtube.com/watch?v=Na4DYI-WjlI&t=755s
• https://developers.google.com/vr/concepts/spatial-audio