DirAC divides captured sound into diffuse and non-diffuse streams

Evidence

An example of the implementation of DirAC is shown in Figure 14.6. In the analysis, the direction and diffuseness of the sound field are estimated using temporal energy analysis in the auditory frequency bands, as described below. The direction is expressed in azimuth and elevation angles, indicating the most important direction of arrival of sound energy. Diffuseness is a real number between zero and one, which indicates whether a sound field more closely resembles a plane wave or a diffuse field. Virtual microphones are then formed from B-format signals, which are divided into a diffuse stream and a non-diffuse stream using the diffuseness parameter. The non-diffuse stream is assumed to contain sound that originates primarily from one source, allowing it to be applied in a single direction. — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 1867

Categorization

• DEFINE: Explains the diffuseness parameter (0-1) and the diffuse/non-diffuse stream split that implements the DirAC assumption.