Higher-Order Loudspeakers and Active Compensation for Improved 2D Sound Field Reproduction in Rooms
Mark A. Poletti, Terence Betlehem, Thushara Dheemantha Abhayapala · Journal of the Audio Engineering Society · 2015
A prototype 2D surround sound system was developed to investigate the use of higher order loudspeakers and active compensation to both eliminate unwanted reflections and to improve spatial accuracy in semi-reverberant rooms.The loudspeakers, and the calibration microphone, were cylindrical designs as these are lower cost than spherical designs and better suited to 2D reproduction.This paper presents the cylindrical coordinate based theory for the calibration of the system, a description of the transducers and processing system, and experimental results obtained using a sound reproduction system consisting of five thirdorder loudspeakers.Approximately anechoic reproduction is achieved over a radius exceeding 90 mm and over a frequency range up to 8 kHz.