Figure 4
From: Dual frequency sound absorption with an array of shunt loudspeakers
(a) The random incident absorption coefficient for the array of SLs with different acoustic impedance ratios, (b)–(c) random incident absorption efficient of the SL array with different area ratios at target frequencies (b) at 100 Hz (c) at 200 Hz [drawn with MATLAB 2019a (https://itsc.nju.edu.cn/21628/list.htm) and Adobe Illustrator CC 2018(https://itsc.nju.edu.cn/adobe/list.htm)].
