Research on Directivity Pattern Control for Phased Rectangular Loudspeaker Array

摘要

This paper studies the control technologies of directive property for a phased rectangular loudspeaker array. The sound field directivity pattern and sound pressure level(SPL) of the main beam was analyzed with numerical simulation and experiments. The results show that the suppression of grating lobe is most efficient when horizontal deflection angle( α_0) is 45 . The SPL of the main beam decreased less than 1dB when the beam deflected in the plane of α_0=0 . The directional accuracy deviation of the main beam occurs when the vertical deflection is over 50°, and the deviation level is about 5°. The reasons resulted in SPL reduction was that the array elements are not the pulsating sphere source and the mutual acoustic impedance effect existed between elements. The directional accuracy of main beam is due to the mutual acoustic impedance and the diffraction in the edge of baffle.