Open ear gain

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The Open Ear Gain ( OEG ) describes the self-amplification of the external auditory canal in the open ear, i.e. H. without z. B. an earphone or the otoplastic of a hearing aid is used. The gain results from the resonance through the length of the auditory canal and is most pronounced in the frequency range from around 2 to 5  kHz , where it can be up to 20  dB .

This reinforcement varies from person to person. In the IEC 60118-8: 2005 standard, the OEG values ​​from measurements with the KEMAR artificial head are used, with a maximum gain of 18 dB just below 3 kHz.

In humans, the individual open ear gain can be measured by an in-situ system with the help of a probe tube or probe microphone that is inserted into the ear canal.

When fitting hearing aids, the individual differences in the OEG can play a role, as it has an influence on the actual amplification of the hearing aid.

Earphones that close the ear canal change the resonance behavior of the ear canal. This difference to the OEG can be taken into account by compensating the frequency response of the earphone.