Distribution und Control of Sound for Immersive Audio Applications
This article describes how Ethernet AVB is used to distribute sound from Digital Audio Workstation software to Ethernet AVB-capable endpoints. The AVDECC control protocol, an open standard, is used to control a signal processing capability on the endpoints. A particular use for this capability is in the field of immersive sound. The endpoints can be speakers connected to POE+ switches, thereby enabling the transmission of audio streams, control and power. This eases the configuration of immersive sound systems. The clocking and stream reservation capabilities of Ethernet AVB ensure that all devices work from the same clock, and that stream transmission is deterministic.
There are a number of workstation-based approaches to generating multi-channel spatial sound. These vary from spatial audio plugins that are incorporated into Digital Audio Workstations (DAWs), to modular toolkits that have spatial audio capabilities added to them. In all cases these approaches depend on hardware audio interfaces and their associated workstation drivers to provide access to multiple audio output transmission channels. Application Programming Interfaces (APIs) enable applications to present audio output configurations to users.