Attenuation and latency are important performances of earmuff, where the former defines passive noise reduction capability, the latter is a key factor in the design of a feedforward active noise control earmuff. Previously an earmuff lumped parameter model was developed to predict earmuff attenuation. The aim of this work was to predict earmuff latency by using the lumped parameter model (LPM). The latency analytic solution was derived from the time domain transfer function between inside and outside of earmuff using earmuff LPM. Results demonstrated that the decreases of earmuff cushion stiffness, damping, and air stiffness or the increase of earmuff mass would achieve a longer passive latency. To examine the validity of the proposed method, an earmuff prototype was built, and experiments were conducted. The measured attenuation and latency were in agreement with the theoretical prediction.

衰减和潜伏期是耳罩的重要性能，前者定义了被动降噪功能，后者是前馈主动噪声控制耳罩设计的关键因素。以前，耳罩集总参数模型用于预测耳罩衰减。这项工作的目的是通过使用集总参数模型（LPM）预测耳罩潜伏期。潜伏期分析解决方案是使用耳罩LPM从耳罩内外之间的时域传递函数得出的。结果表明，耳罩垫的刚度，阻尼和空气刚度的降低或耳罩质量的增加将获得更长的被动潜伏期。为了验证该方法的有效性，建立了耳罩原型，并进行了实验。