| 摘要 |
Hearing protectors having an earshell and ear cushion enclose a volume of air. A membrane in the earshell has a predetermined stiffness and mass so as to flatten the attenuation response of the protector from low frequencies (200Hz or less) up to frequencies important for understanding speech tat least 2kHz). Alternate or additional structures for flattening the response include further membranes and barriers dividing the enclosed volume of the shell with interconnecting tubes. An ear plug is also disclosed. |
