title: Acoustic contrast, planarity and robustness of sound zone methods using a circular loudspeaker array.
abstract: Since the mid 1990s, acoustics research has been undertaken relating to the sound zone problem-using loudspeakers to deliver a region of high sound pressure while simultaneously creating an area where the sound is suppressed-in order to facilitate independent listening within the same acoustic enclosure. The published solutions to the sound zone problem are derived from areas such as wave field synthesis and beamforming. However, the properties of such methods differ and performance tends to be compared against similar approaches. In this study, the suitability of energy focusing, energy cancelation, and synthesis approaches for sound zone reproduction is investigated. Anechoic simulations based on two zones surrounded by a circular array show each of the methods to have a characteristic performance, quantified in terms of acoustic contrast, array control effort and target sound field planarity. Regularization is shown to have a significant effect on the array effort and achieved acoustic contrast, particularly when mismatched conditions are considered between calculation of the source weights and their application to the system.
authors.affiliation: Centre for Vision, Speech and Signal Processing, University of Surrey, Guildford, Surrey, GU2 7XH, United Kingdom.
authors.forename: Philip
authors.initials: P
authors.lastname: Coleman
authors.affiliation: Centre for Vision, Speech and Signal Processing, University of Surrey, Guildford, Surrey, GU2 7XH, United Kingdom.
authors.forename: Philip J B
authors.initials: PJ
authors.lastname: Jackson
authors.affiliation: Centre for Vision, Speech and Signal Processing, University of Surrey, Guildford, Surrey, GU2 7XH, United Kingdom.
authors.forename: Marek
authors.initials: M
authors.lastname: Olik
authors.affiliation: Bang & Olufsen A/S, Peter Bangs Vej 15, DK7600, Struer, Denmark.
authors.forename: Martin
authors.initials: M
authors.lastname: Møller
authors.affiliation: Bang & Olufsen A/S, Peter Bangs Vej 15, DK7600, Struer, Denmark.
authors.forename: Martin
authors.initials: M
authors.lastname: Olsen
authors.affiliation: Bang & Olufsen A/S, Peter Bangs Vej 15, DK7600, Struer, Denmark.
authors.forename: Jan
authors.initials: J
authors.lastname: Abildgaard Pedersen