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DIN EN IEC 60318-8:2023-12

Electroacoustics - Simulators of human head and ear - Part 8: Acoustic coupler for high-frequency measurements of hearing aids and earphones coupled to the ear by means of ear inserts (IEC 60318-8:2022); German version EN IEC 60318-8:2022

Edition date: 2023-12-01
In Force
Available languages: German
Summary: Advancement in hearing aid design makes it possible to increase the bandwidth of hearing aids up to 16 kHz. The 2 cm³ coupler (IEC 60318-5) is suitable for measurements up to 8 kHz. At frequencies above 8 kHz high measurement uncertainty will occur in earphone responses, due to acoustic resonances in the coupler.The occluded-ear simulator as described in IEC 60318-4 simulates the human external ear up to 10 kHz and can be used as an acoustic coupler up to 16 kHz. It is designed with a principal cavity length which produces a half-wavelength resonance of the sound pressure at approximately 13,5 kHz. This resonance, which is also present in a person´s ear canal but more controlled by the tympanic membrane, can also cause measurement uncertainty in earphone responses above 10 kHz. Accordingly, there is a need for a well-defined and robust acoustic coupler to be used by the transducer (receiver, earphone) designer, the hearing aid designer, and the fitter of hearing aids for earphone measurements in the frequency range 8 kHz to 16 kHz. The sound pressure developed by an earphone is, in general, not the same in an acoustic coupler as in a person´s ear. However, it can be used as a simple and ready means for the exchange of specifications and test data on hearing aids and insert earphones used in audiometry. This part of the IEC 60318 series of standards describes an acoustical coupler as required in IEC 60118-0 for loading a hearing aid or insert earphone with a specified impedance when testing acoustic performance, in the frequency range up to 16 kHz.

Durch die Weiterentwicklung des Hörgerätedesigns kann die Bandbreite von Hörgeräten auf bis zu 16 kHz erhöht werden. Der 2 cm³-Koppler (IEC 60318-5) ist für Messungen bis 8 kHz geeignet. Bei Frequenzen über 8 kHz tritt aufgrund akustischer Resonanzen im Koppler eine hohe Messunsicherheit bei den Kopfhörerantworten auf. Der in IEC 60318-4 beschriebene Okklusionsohrsimulator simuliert das menschliche Außenohr bis zu 10 kHz und kann als akustischer Koppler bis zu 16 kHz verwendet werden. Er ist mit einer Haupthohlraumlänge ausgelegt, die eine Halbwellenlängenresonanz des Schalldrucks bei ungefähr 13,5 kHz erzeugt. Diese Resonanz, die auch im Gehörgang einer Person vorhanden ist, kann auch zu Messunsicherheit bei Kopfhörerreaktionen über 10 kHz führen. Somit besteht ein Bedarf an einem genau definierten und robusten akustischen Koppler, der vom Wandler- (Empfänger-, Kopfhörer-), Entwickler, Hörgerätedesigner und dem Hörgeräteinstallateur für Kopfhörermessungen im Frequenzbereich von 8 kHz bis 16 kHz verwendet wird. Der von einem Kopfhörer entwickelte Schalldruck ist bei einem akustischen Koppler im Allgemeinen nicht der gleiche wie beim Ohr einer Person. Ein akustischer Koppler kann jedoch in der Audiometrie als einfaches und leichtes Mittel für den Austausch von Spezifikationen und Testdaten auf Hörgeräten und Einsteckkopfhörern verwendet werden. Dieser Teil der Normenreihe IEC 60318 beschreibt einen akustischen Koppler gemäß IEC 60118-0 zum Laden eines Hörgeräts oder zum Einsetzen eines Kopfhörers mit einer bestimmten Impedanz beim Testen der akustischen Leistung im Frequenzbereich bis 16 kHz.
Keywords: Acoustic couplers|Acoustics|Artificial ears|Audiometers|Audiometry|Calibration|Couplers|Definitions|Design|Dimensions|Ear simulators|Earphones|Ears|Electrical engineering|Electroacoustics|Environment|Environmental condition|Frequencies|Head (anatomy)|Headphones|Hearing aids|High-frequency measurement|Loss of hearing|Measurement microphones|Microphones|Pressure compensation|Pressure force|Pure-tone audiometers|Reference levels|Simulators|Sound levels|Sound pressure level|Specification (approval)|Testing|Vibration engineering|Wide band transmission
ICS: 17.140.50-Electroacoustics
CTN:

International Equivalence

Identic EN IEC 60318-8:2022

Identic IEC 60318-8:2022

Reemplazo Normas

Reemplaza a DIN EN IEC 60318-8:2022-05

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