PubMed · 682811
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L L Pratt. 1978. FDA hearing regulations.. https://pubmed.ncbi.nlm.nih.gov/682811/
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Evidence in the literature states that minimally 50% of the hearing aids that are worn by children are malfunctioning. The result is that these hearing aids are rejected by children who probably could benefit from amplification. This study shows that a large percentage of new hearing aids malfunction according to a number of specified parameters and points out the reasons for the malfunctioning. A cross-sectional sample of 14 manufacturers' hearing aid submissions (a total of 166 new aids) were comprehensively studied by the British Columbia Research and Development Laboratory, Victoria. Sixty-five percent of the hearing aids failed the primary and secondary criteria during the initial evaluation period. Results of this study provided valuable information to manufacturers of hearing aids and also to those who fit hearing aids with regard to improvements necessary to meet reasonable standards.
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A portable programmable hearing aid with multichannel compression was constructed with three channels with two independently variable crossover frequencies. The compression knee-point and attenuation in each channel and the two crossover frequencies can be programmed from a separate programming unit. Speech discrimination for seven subjects with sensorineural hearing loss was evaluated, comparing each subject individually in three different cases--equalization, multichannel compression and the subject's own conventional hearing aid. Each subject wore each aid for about a week in his/her own environment and was then tested. The following speech discrimination tests were used: monosyllabic phonetically balanced words with and without background noise, nonsense syllables in quiet, and a constant test in quiet and in noise. The study showed that some patients with sensorineural hearing loss accompanied by recruitment can double their speech discrimination by using a hearing aid with multichannel compression.