1 Scope
This part of IEC 60118 gives definitions for common hearing aid features
such as noise
reduction or feedback reduction, etc. Only acoustical
inputs are considered. Binaural features are currently not covered in this document.
In addition, measurement procedures are described to verify hearing aid features.
The objective is not to evaluate the performance of features but to verify their
existence and functionality.
Furthermore, definitions and procedures are kept as general as possible so that this
document can be applied to various types of hearing aids , for example, air-conduction
hearing
aids or bone conduction hearing aids . To this end, the general
definition for the term " hearing aid " given in IEC 60118‑0
is adopted, and this document does not refer to any specific ear simulator or
acoustic coupler but uses a general definition of a coupler. However, if a general
view is not applicable or leads to unclear or complex wording, the situation for an
air-conduction hearing
aid only is considered. Nevertheless, an explanation is given on
how this document can be applied to hearing aids which do not use air
conduction.
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