| Zugriffsnummer | 21860 |
| Dokumenttyp | Bericht |
| Sprache | Englisch |
| Titel | Measurement of the acoustical impedance of artificial ears : a report on EURAMET project 791 |
| Autor(in); Institution |
Barham, Richard; National Physical Laboratory (NPL), Quality of Life Division, Teddington, UK
Rasmussen, Knud; DPLA-DFM, Lyngby, DENMARK
Fedtke, Thomas; 1.6, Schall, PTB-Braunschweig
Rodrigues, Dominique; Laboratoire National de Métrologie et d'Essais, Trappes, FRANCE
Zmierczak, Tomasz; Central Office of Measures, Warsaw, POLAND
|
| Quelle/Jahr | (2008), IV, 20 S. |
| Schriftenreihe | NPL report AC: 6 |
| URL | |
| Berichtsnummer | NPL Report AC 6 |
| Verlag | Teddington, Middlesex: National Physical Laboratory |
| Zusammenfassung | Ear simulators are measuring instruments for the objective evaluation of the acoustical performance of earphones and other devices designed to be coupled acoustically to human ears. A device, often referred to as the artificial ear, is used widely in audiometry, telecommunications and audio engineering, and its specification is given in IEC 60318-1. This document is currently under revision by IEC to include: an extension of the frequency range to 16 kHz, assimilation of the scope of IEC 61318-2 for the measurement of circumaural headphones, and most significantly, a method for determining the acoustical impedance. This report describes collaborative research that has been conducted by five European National Metrology Institutes to establish a new measurement method. This method has been used to produce normative data for the acoustical transfer impedance as well as the corresponding measurement uncertainty. The report then recommends a new specification for the impedance and its tolerance, as well as consequential changes to the associated lumped parameter model. |
