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Ideally, the ARA headset should be acoustically transparent, that is, it should not cause audible modification to the surrounding sound. A practical implementation of an ARA mixer requires a low\u2010latency headphone reproduction system with additional equalization to compensate for the attenuation and the modified ear canal resonances caused by the headphones. This paper proposes digital IIR filters to realize the required equalization and evaluates a real\u2010time prototype ARA system. Measurements show that the throughput latency of the digital prototype ARA system can be less than 1.4\u2009ms, which is sufficiently small in practice. When the direct and processed sounds are combined in the ear, a comb filtering effect is brought about and appears as notches in the frequency response. The comb filter effect in speech and music signals was studied in a listening test and it was found to be inaudible when the attenuation is 20\u2009dB. Insert ARA headphones have a sufficient attenuation at frequencies above about 1\u2009kHz. The proposed digital ARA system enables several immersive audio applications, such as a virtual audio tourist guide and audio teleconferencing.<\/jats:p>","DOI":"10.1155\/2012\/457374","type":"journal-article","created":{"date-parts":[[2012,10,20]],"date-time":"2012-10-20T21:00:20Z","timestamp":1350766820000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":18,"title":["Digital Augmented Reality Audio Headset"],"prefix":"10.1155","volume":"2012","author":[{"given":"Jussi","family":"R\u00e4m\u00f6","sequence":"first","affiliation":[]},{"given":"Vesa","family":"V\u00e4lim\u00e4ki","sequence":"additional","affiliation":[]}],"member":"311","published-online":{"date-parts":[[2012,10,20]]},"reference":[{"key":"e_1_2_9_1_2","first-page":"618","article-title":"Augmented reality audio for mobile and wearable appliances","volume":"52","author":"H\u00e4rm\u00e4 A.","year":"2004","journal-title":"Journal of the Audio Engineering Society"},{"key":"e_1_2_9_2_2","doi-asserted-by":"crossref","unstructured":"LindemanR. 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