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The importance of perceptual bandwidth and how frequency compression extends it

It is particularly important for people with hearing impairment to be able to perceive and discriminate highfrequency sounds easily and accurately. These signals contain information about speech that enhances intelligibility, especially in some common noisy listening conditions. Clear perception of such sounds can also provide valuable localization cues and specific benefits for speech production. Recently, some advanced digital hearing instruments have been introduced that are said to provide extended bandwidth and, therefore, to improve amplification of high-frequency sounds. However, the bandwidth measured using electroacoustic techniques is not necessarily representative of the perceptual bandwidth obtained with real fittings. When the perceptual bandwidth is estimated, taking into account the audiogram of each hearingimpaired listener, it can be demonstrated that the greater amplification of high frequencies expected with extendedbandwidth devices is difficult to achieve in practice. In contrast, our research has found that Phonak’s non-linear frequency-compression scheme SoundRecover can effectively extend the perceptual bandwidth by improving audibility and discriminability of highfrequency signals.