Abstract
By using a horn loudspeaker, experimental data on the parametric array in air are taken for the beam pattern and the propagation curve. The primary frequencies are 20kHz and 15kHz, so the difference frequency signal generated by the parametric array is 5kHz. Because of space limitation and weakness of the primary waves, all measurements are carried out in the interaction region. As spurious difference signals produced in the source are strong, the corrected predictions are presented for acoustical properties of the array. The correction curves of the parametric array is also presented in this paper.
