Electroacoustics. Simulators of human head and ear - 2 cm³ coupler for the measurement of hearing aids and earphones coupled to the ear by means of ear inserts Ingestion-build-225643 — nuclear medicine

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Electroacoustics. Simulators of human head and ear - 2 cm³ coupler for the measurement of hearing aids and earphones coupled to the ear by means of ear inserts Ingestion-build-225643 — nuclear medicine1 Scope This part of IEC 60318 describes an acoustic coupler for loading an earphone or hearing aid with a specified acoustic impedance when determining its physical performance characteristics, in the frequency range 125 Hz to 8 kHz. It is suitable for air conduction hearing aids and earphones, coupled to the ear by means of ear inserts e. g. ear moulds or similar devices. The sound pressure developed by an earphone is not, in general, the same in