Abstract: A hearing protection device to be worn at either a primary position or a secondary position, comprising a hearing protection component and a noise measurement component, and an attachment mechanism to securely attach the noise measurement component to the hearing protection component, wherein at the primary position the noise measurement component detects a protected noise exposure and at the secondary position it detects an unprotected exposure, the noise measurement component comprises a microphone, a compartment that encloses the microphone and at least one filter, and the filter reduces resonance of said compartment incident upon said microphone.

Abstract: A method for continuously monitoring noise exposure level of a person via measuring sound level within an ear canal of the person using a sound measurement means linked to a sound level recording device external to the ear canal, wherein the sound measurement means may be shielded from the environment by a hearing protective device, and wherein the cable does not interfere with the ability of the hearing protective device to reduce noise exposure level in the ear canal. Also provided are a system comprising a sound measurement means mounted within an ear canal of the person, an external sound level recording means and a linking cable.

Abstract: An apparatus adapted to be worn in an environment in which unsafe noise levels may be present for the purpose of continuously monitoring the noise level impinging upon the ear(s) of a user. The noise levels are monitored via a microphone housed within a hearing protective device, and located such that the noise level measured by the microphone is representative of the noise level impinging upon the ear(s) of the user when the hearing protective device is being worn in either a primary or secondary position. The noise level is recorded along with its duration to calculate a cumulative noise dose for an individual user, and to warn the user of when the noise dose exceeds a preset level. The apparatus further provides for a means of transmitting the noise level and dose information to a data storage/retrieval device such as a PC for maintaining a history of noise exposure for the individual user of the device.