Enables a realistic 3D voice experience that matches the game environment
Delivers a clear signal, free of unwanted noise, echo, and clipping
Expands creative game-play options for developers
Scales seamlessly across servers to support large virtual worlds
Dolby® Axon represents the future of voice communication for online games and virtual worlds. Crafted from the ground up specifically for game developers, Dolby Axon enables a realistic 3D voice experience that matches the game environment and greatly expands game-play possibilities.
A host of innovative features makes Dolby Axon unique and flexible, including 3D voice capabilities. Distance attenuation makes voices become louder as players approach one another within the game, or softer as the distance between players increases. Surround panning helps players locate competitors spatially within the game environment.
Dolby Axon also features an occlusion engine that further enhances the realism of voice communication. Because the Dolby Axon server dynamically responds to game geometry, players are able to hear around corners, for example, but not through walls. Likewise, the voice of a player who steps behind a solid barrier becomes harder to hear, just as it would in real life.
Voice fonts are another Dolby Axon feature. These allow players to alter their voices to better match their in-game personas. Someone with a naturally high voice, for example, can adopt the deep, menacing voice of a mercenary.
With or without the use of voice fonts, Dolby Axon’s innovative voice processing technologies combine to deliver a clear voice experience free of unwanted noise, echo, clipping, and leveling problems. And its flexible API presents new game-play options for developers, allowing them to introduce spy microphones and other specialized voice items into their games.
Why Dolby
As online games become more sophisticated and popular, the voice experience of these virtual worlds remains primitive. In-game communication is subject to unwanted noise, clipping, and other audio problems, and voices bear no spatial relationship to the game environment.
Dolby Axon raises the voice component of online gaming to a new level through a number of innovative features:
Realistic 3D voice communication complete with surround panning and distance attenuation
Advanced occlusion engine that maps voices to the game environment
Enabled voice fonts for improved role-playing
Proprietary audio technologies to deliver a clear voice experience
Flexible API for creative integration and game-play options
In addition, Dolby Axon is a model of scalability and efficiency. Advanced server mixing and networking technology, in combination with a proprietary Dolby codec, make it possible for Dolby Axon to support thousands of users per server and scale seamlessly across servers to support extremely large virtual worlds. Even better, Dolby Axon achieves these results at very low bandwidths—as low as 16 kbps per player for complex surround scenes.
Dolby Axon also offers game operators server and abuse monitoring tools to make operating voice servers easy, and its flexible hosting options mean that operators are free to select the setup that works best for their needs.
Voice Quality
Dolby® Axon uses a proprietary voice codec that can operate at different bit rates for varying bandwidth/quality requirements:
Low-bit-rate version—8 kbps (16 kHz sample rate)
High-quality version—16 kbps (16 kHz sample rate)
Dolby Surround Rendering
7.1 channels
5.1 channels
Two channels (using Dolby Virtual Speaker technology)
Headset/headphones (using Dolby Headphone technology)
Integration
Server-side API
Client-side API
Peer-served first-person shooter
Server-based massively multiplayer online game
Server Tools
Abuse reporting systems
Monitoring tools that integrate into an existing monitoring system or use SNMP
Voice Pipeline Enhancements
Microphone leveling
Microphone clipping prevention
Input noise reduction
Voice activity detection
Multichannel echo suppression
Voice fonts
Channel Types
Spatial channels (attenuated by distance and in-game objects)
Spatial global channels (directional; not attenuated by distance or objects)
Nonspatial global channels (not attenuated, not spatial)
Server Technology
Full 3D virtual world support
Spatial and discrete channels
Instance support
Occlusion engine
Dynamic game geometry
Dynamic scene simplification (to cope with an unexpected server load without glitches)
Bandwidth Efficiency
Average of 10 people within hearing range, 20 percent speaking at any instant:
Client download ~16 kbps for low-bit-rate voice codec
Client upload ~3 kbps for low-bit-rate voice codec
Client download ~26 kbps for high-quality voice codec
Client upload ~5 kbps for high-quality voice codec
Scalability
Average of 10 people within hearing range, 20 percent speaking at any instant:
7,000 simultaneous users per server
Dual 3 GHz CPU quad-core Xeon server
Over 100,000 users in one continuous virtual world (with multiple servers)
Scales across multiple servers for application in large virtual worlds