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OBJECTIVES The effectiveness of hearing protection devices (HPDs), when used in workplace conditions, has been shown over the years to be usually lower than the labeled values obtained under well-controlled laboratory conditions. Causes for such discrepancies have been listed and discussed by many authors. This study is an attempt to understand the issues(More)
Numerous studies have shown that the reliability of using laboratory measurements to predict individual or even group hearing protector attenuation for occupationally exposed workers is quite poor. This makes it difficult to properly assign hearing protectors when one wishes to closely match attenuation to actual exposure. An alternative is the use of(More)
This paper presents a field-microphone-in-real-ear (MIRE) method for the objective measurement of individual earplug field attenuation. This development was made possible by using a recently designed instrumented expandable custom earplug. From the measurement of the noise reduction (NR) through the earplug, this method predicts the attenuation that would(More)
OBJECTIVE This paper examines the integration of a non-invasive vital sign monitoring feature into the workers' hearing protection devices (HPDs) by using a microphone positioned within the earcanal under the HPD. METHODS 25 test-subjects were asked to breathe at various rhythms and intensities and these realistic sound events were recorded in the(More)
This paper presents a study on the effect of an intra-aural Audio Wearable Device (AWD) on sound source localization. The AWD used in this study is equipped with a miniature outer-ear microphone, a miniature digital signal processor and a miniature internal loudspeaker in addition to other electronics. It is aimed for audio augmented reality applications,(More)
OBJECTIVE Speech production in noise with varying talker-to-listener distance has been well studied for the open ear condition. However, occluding the ear canal can affect the auditory feedback and cause deviations from the models presented for the open-ear condition. Communication is a main concern for people wearing hearing protection devices (HPD).(More)