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IEC 60318-4-ed.1.0
Electroacoustics - Simulators of human head and ear - Part 4: Occluded-ear simulator for the measurement of earphones coupled to the ear by means of ear inserts
STANDARD published on 21.1.2010
The information about the standard:
Designation standards: IEC 60318-4-ed.1.0
Publication date standards: 21.1.2010
SKU: NS-409548
The number of pages: 38
Approximate weight : 114 g (0.25 lbs)
Country: International technical standard
Category: Technical standards IEC
The category - similar standards:
Annotation of standard text IEC 60318-4-ed.1.0 :
IEC 60318-4:2010 describes an occluded-ear simulator intended for the measurement of insert earphones in the frequency range from 100 Hz to 10 000 Hz. 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 occluded-ear simulator is also suitable as the basis for an extension intended to simulate the complete ear canal and the outer ear (for instance in head simulators). The occluded-ear simulator simulates the acoustic transfer impedance for the occluded normal adult human ear. However, it does not simulate the leakage between an earmould and a human ear canal; therefore, the results obtained with the occluded-ear simulator may deviate from the performance of an insert earphone on a real ear, especially at low frequencies. Moreover, large performance variations among individual ears will occur which should be considered when using the ear simulator. Above 10 kHz the device does not simulate a human ear, but can be used as an acoustic coupler at additional frequencies up to 16 kHz. Below 100 Hz, the device has not been verified to simulate a human ear, but can be used as an acoustic coupler at additional frequencies down to 20 Hz. IEC 60318-4:2010 cancels and replaces IEC 60711, published in 1981 and constitutes a technical revision. The main changes with respect to the previous edition are listed below: - extension of the usable frequency range to 100 Hz - 16 000 Hz; - addition of values of maximum permitted expanded uncertainties to all tolerances. La CEI 60318-4:2010 decrit un simulateur doreille occluse, destine a la mesure des ecouteurs internes, dans la plage de frequences comprise entre 100 Hz et 10 000 Hz. Ce simulateur est adapte aux appareils de correction auditive et ecouteurs en conduction aerienne, couples a loreille au moyen dembouts, par exemple embouts moules ou dispositifs similaires. Le simulateur doreille occluse peut aussi etre utilise comme appareil destine a simuler le canal auditif complet et loreille externe (par exemple, dans les simulateurs de tete). Le simulateur doreille occluse simule limpedance acoustique de transfert pour loreille occluse humaine normale dadulte. Il ne simule cependant pas la fuite entre lembout moule et le canal auditif humain; par consequent, les resultats obtenus avec le simulateur doreille occluse peuvent secarter des resultats fournis par un ecouteur interne couple a une oreille reelle, particulierement aux frequences basses. De plus, de grandes variations des resultats existent pour differentes oreilles, ce quil convient de prendre en compte lors de lutilisation du simulateur doreille. Au-dela dune frequence de 10 kHz, le dispositif ne simule pas loreille humaine, mais peut en revanche etre utilise comme coupleur acoustique a des frequences supplementaires jusqua 16 kHz. En dessous dune frequence de 100 Hz, il na pas ete verifie que le dispositif simule loreille humaine, ce dernier pouvant en revanche etre utilise comme coupleur acoustique a des frequences supplementaires jusqua 20 Hz. La CEI 60318-4:2010 annule et remplace la CEI 60711, parue en 1981, dont elle constitue une revision technique. La liste des principales modifications par rapport a ledition precedente est la suivante: - elargissement du domaine de frequence utile de 100 Hz a 16 000 Hz; - ajout des valeurs dincertitude elargie maximale admise a toutes les tolerances.
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