【摘要】 本文提出一种把闭环反馈式控制方式和开环前馈式控制方式结合在一起的复合式消声耳罩，并给出了原理式和具体的结构。理论和实验表明这种复合式结构具有有源消声频带宽、消声效果好的特点。更多还原

【Abstract】 in this paper a compound active noise cancellation earmnff combining the close loop feedbackcontrol method and the open loop feedforward control method is proposed and the formula representing the principle of noise cancellation as well as the stucture are given. This compound active noisecancellation structure features a wide concellation band and an excellent cancellation effect.更多还原