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VIVE 3DSP Audio SDK is an audio solution for simulating realistic sounds in the virtual world. The SDK could be used to create engaging and immersive spatial audio for VR apps or experiences. A host of features are designed for developers.
Some of the unique features of VIVE 3DSP Audio SDK:
- Higher Order Ambisonics (HOA) Highly optimized 3rd order HOA is implemented with very low computing power.
- Head-Related Transfer Function (HRTF) The precise HRTF is modelled in this SDK for every 5 degree angles.
- Room Audio The reflection and reverberation of a real space are simulated in the room audio model.
- Hi-Res Audio Settings The quality is kept when Hi-Res audio is processed with VIVE 3DSP Audio Features.
- Sound Decay Model The real-world modelling is adopted to create the sound decay model.
- Geometric occlusion The super-efficient occlusion model works well without any Unity collider. Moreover, the virtual sound wave could be partially occluded according to the obstacle geometry.
- Ambisonic Decoder The AmbiX file is supported in the SDK.
VIVE 3DSP Audio SDK is hardware-independent, high-quality, user-friendly, and powerful. Outstanding sound experiences can be provided especially for VIVE devices.
Ambisonics is the technology that uses a full-sphere surround sound technique to simulate spatial sound. Spherical harmonics is presented as the sound pressure changes around the listener. The order of the spherical harmonics is also called the order of ambisonics. The order of ambisonics has a big influence on the realistic depiction of the direction of sound. Therefore, 3rd order ambisonics is used in the spatial audio model as it generates the better directivity of a spatial sound. When the higher order is used, higher computing power is required for the ambisonic process. However, as a patent-pending technique is used on the VIVE 3DSP ambisonic process, it just requires a low computing power similar to the 1st order ambisonic.
The technology simulates the room audio with the early reflection, late reverberation, background noise, environment materials and so on.
There is a sound level decrease during sound transmission in real word. However, the changes are different in different conditions. In HTC VIVE 3DSP Audio SDK, several decadence models are provided.
The occlusion effect is used to accurately simulate what happens to sound when it encounters an obstacle in its transmission path. Both of mono and binaural occlusion modes could be set up in HTC VIVE 3DSP Audio SDK.
- Geometric Occlusion: The geometric occlusion calculates the covering ability by analytical geometry techniques. Since there is no need to use the Unity collider.
- Raycast Occlusion: The covering ability of an obstacle is calculated by casting many rays into space and enumerate how many of them are blocked.
The VIVE 3DSP Audio SDK supports room effect, room reverberation and reflection, and acoustic occlusion. It also has spatial effect optimization for VIVE Pro Headphones. However the original VIVE and other HMDs and headphones are also supported.
