Comparison of Error Metrics in Loudspeaker-Based Reproduction Systems
* Präsentierender Autor
Zusammenfassung:Depending on the spatial audio reproduction method, surrounding spherical loudspeaker arrays enable either physically correct sound field synthesis in a physically constrained sweet spot or rather aim at perceptually correct reproduction. Feasible methods include modal-based approaches such as higher-order Ambisonics with a continuous virtual panning function, facilitating phantom sources with panning-invariant energy and spread by use of sub-band weighting for side lobe suppression and a suitable decoder strategy for the given loudspeaker layout. Instead, multiple-direction amplitude panning is based on three-dimensional amplitude panning with discrete loudspeaker gains and vectors, also aiming at constant spread of phantom sources with reduced coloration, but without claiming physical correctness. Representing a fundamentally different approach, acoustic crosstalk cancellation relies on the concept of binaural technology and enables the creation of physically correct signals at the entrance of the ear canals. Although these methods have been well researched individually, there has been only little comparative measurement-based evaluation to validate simulations considering practical imperfections. Such a comparison is presented based on various error metrics.