The National Acoustic Laboratories' (NAL) new procedure for selecting the gain and frequency response of a hearing aid.

@article{Byrne1986TheNA,
  title={The National Acoustic Laboratories' (NAL) new procedure for selecting the gain and frequency response of a hearing aid.},
  author={Denis Byrne and Harvey Dillon},
  journal={Ear and hearing},
  year={1986},
  volume={7 4},
  pages={257-65}
}
A new procedure is presented for selecting the gain and frequency response of a hearing aid from pure-tone thresholds. This was developed from research which showed that a previous procedure did not meet its aim of amplifying all frequency bands of speech to equal loudness but that frequency responses which did so were considerably more effective. Measurements of 30 sensorineurally hearing-impaired ears (27 subjects), together with data from other studies, were analyzed to determine the best… CONTINUE READING
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