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NAL-NL2 empirical adjustments
(Trends Amplification, 2012)
NAL-NL1, the first procedure from the National Acoustic Laboratories (NAL) for prescribing non-linear gain, was a purely theoretically-derived formula aimed at maximizing speech intelligibility for any input level of speech ...
Validity and reliability of in-situ air conduction thresholds measured through hearing aids coupled to closed and open instant-fit tips.
(International Journal of Audiology, 2010)