The Study Of The Variable Directivity Of Loudspeaker Array Based On Sub-band Technology

In large occasions such as stations,airports and sports centers,The application of variable pointing loudspeaker arrays is becoming more and more widespread.The sound reinforcement system controls the directivity of the array precisely so that the main energy of the emitted sound waves is centrally controlled and transmitted to the audience area.At the same time,avoid excessive sound energy transmission to ceilings or other side walls,which are likely to cause reflections,and improve the language clarity of the stadium.In this paper,we have done the following work for the problems of the existing variable directional array loudspeakers: A.Introduction of uniform linear array model,narrowband and wideband signal signal beamformer principle,compared different methods of beamforming,Matlab simulation by the influence of the different weights of the magnitude of the beam shape;B.Design interface software,making the beam according to different parameters renderings and transmission weighting coefficients obtained DSP development board to do the processing;C.Presentation of the working methods of the ADSP-21489-based development board and its internal input and output interfaces.Realization of the weights of the output interface software delivered to the board and real-time processing,in order to achieve a directional change in the array.D.Design line array speaker samples,design test sites and test for directivity effects.