AES Los Angeles 2016
Tutorial T8
Saturday, October 1, 3:15 pm — 4:45 pm (Rm 406AB)
T8 - Introduction to CBT Loudspeaker Arrays
Presenter:D.B. (Don) Keele, Jr., DBK Associates and Labs - Bloomington, IN, USA
Abstract:
CBT is a term originated by the U.S. military in a series of declassified Naval Research Lab underwater-sound ASA papers published in the late 1970s and early 80s. Mr. Keele applied the technology to loudspeaker arrays in a series of nine AES papers between 2000 and 2015 and three more which will be presented at this convention.
CBT arrays provide broadband constant directivity/beamwidth behavior with a 3D sound field control that is exceptionally uniform and well behaved with frequency at all distances, and offer directional performance and sound-field coverage control that is outstanding. CBT array possibilities extend over the full loudspeaker product range from professional, commercial, consumer, home theater, computer, and multimedia. Don will discuss the background and history of CBT arrays including implementation of typical arrays. CBT arrays can be implemented very simply in a passive circular-arc loudspeaker configuration that does not require any sophisticated DSP signal processing except for simple level changes. Straight-line CBT arrays can also be implemented, but these require complex multi-amp configurations with individual DSP delay blocks driving each speaker or complex passive RLC delay networks.
 | This session is presented in association with the AES Technical Committee on Loudspeakers and Headphones |