A Comparison Between Hearing Aids with Directional Microphone and Hearing Aids with Conventional Microphone

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Abstract
In a double blindfold test 22 hearing impaired persons with a slight and moderate hearing loss have compared hearing aids with directional microphone to hearing aids with conventional microphone. A discrimination test in the sound—box showed a significant difference between the two types in favour of the hearing aid with directional microphone. A group conversation situation built up in a sound—box where the testpersons had the opportunity of comparing the two types of hearing aids also showed a significant difference. A comparison in a field test did not show corresponding results. The research project may indicate both pros et cons in connection with the hearing aid with the directional microphone. It was advantageous under critical listening conditions. Disadvantages occurred when the test persons heard sounds from behind. Furthermore there was a disturbing rubbing noise in this hearing aid. 22 hørehœmmede med lette og moderate høretab har i et dobbelt blindforsøg sammenlignet høre—apparater med retningsmikrofoner og høreapparater med konventionelle mikrofoner. Ved en diskriminationsprøve i lydboks viste der sig en signifikant forskel mellem de to typer til fordel for høreapparater med retningsmikrofon. En gruppekonversations—situation opbygget i boksen, hvor forsøgspersonerne havde lejlighed til at sammenligne de to høreapparattyper, viste også signifikant forskel. En sammenligning i et markforsøg gav ikke tilsvarende resultater. Forsøgspersonerne gav her udtryk for fordele og ulemper ved høreapparatet med retningsmikrofon. Fordelen at de hørte bedre under en del kritiske lytteforhold. Ulempen at de havde vanskeligere ved at høre lyde bagfra og end—videre, at der var en generende berøringsstøj ved høreapparatet med retningsmikrofon.

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