Abstract: A hearing protection system comprises a hearing protection device adapted for placement over or insertion into a user's ear. The hearing protection device comprises a first microphone arranged to determine an internal sound level characteristic within the user's ear canal. The hearing protection system further comprises a second microphone arranged to determine an ambient sound level characteristic. The system is arranged to compare the internal and ambient sound level characteristics to determine a difference metric therebetween and to generate an indication if the difference metric is greater than a difference threshold and the internal sound level characteristic is lower than an internal sound threshold.

Abstract: A system including an acoustic barrier suitable for wearing in or on an ear of an individual mammalian subject, and a processor. The acoustic barrier defines at least one sound path therethrough and includes a microphone for measuring sound pressure inside the acoustic barrier. The processor is arranged to receive measurements from the microphone and determine a risk that a sound dose limit will be reached before a predetermined time associated with the dose limit. The system is arranged to provide an indication of the determined risk.

Abstract: A system including an acoustic barrier suitable for wearing in or on an ear of an individual mammalian subject, and a processor. The acoustic barrier defines at least one sound path therethrough and includes a microphone for measuring sound pressure inside the acoustic barrier. The processor is arranged to receive measurements from the microphone and determine a risk that a sound dose limit will be reached before a predetermined time associated with the dose limit. The system is arranged to provide an indication of the determined risk.