Electroacoustics. Hearing aids - Methods of measurement of performance characteritics of hearing aids under simulated in situ working conditions Ingestion-build-159183 BS EN 2012 specifies the

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Electroacoustics. Hearing aids - Methods of measurement of performance characteritics of hearing aids under simulated in situ working conditions Ingestion-build-159183 BS EN 2012 specifies the1 Scope The purpose of this part of IEC 60118 is to describe methods for a test which simulates the acoustical effects of a median adult wearer on the performance of a hearing aid. It establishes certain guidelines for simulated in situ measurements of hearing aids; it describes a simplified method for simulated in situ measurements of hearing aids and a description for determination of the directivity index (DI) of directional microphones in hearing