Acoustics: Spatial Properties
Emmanuel Vincent, Sharon Gannot, Tuomas I. Virtanen · 2018
In multichannel scenarios, the fact the acoustic scene is observed from different positions in space can be exploited for separation and enhancement. In this chapter, we recall basic elements of acoustics and sound engineering, and use them to model multichannel mixtures. We consider the general relationship between a source signal and its spatial image in a given channel, and examine how it translates in the case of microphone recordings or artificial mixtures. We then introduce several possible models based on the acoustic transfer function, the relative transfer function and interchannel phase and level differences, and a full-rank spatial covariance model. We link the parameters of these models to the geometry of the sound scene, including the source direction of arrival.