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eLibrary > BS EN IEC 60318-8:2022 Electroacoustics. Simulators of human head and ear - Acoustic coupler for high-frequency measurements of hearing aids and earphones coupled to the ear by means of ear inserts >

BS EN IEC 60318-8:2022 Electroacoustics. Simulators of human head and ear - Acoustic coupler for high-frequency measurements of hearing aids and earphones coupled to the ear by means of ear inserts, 2022

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BS EN IEC 60318-8:2022 Electroacoustics. Simulators of human head and ear - Acoustic coupler for high-frequency measurements of hearing aids and earphones coupled to the ear by means of ear inserts, 2022

undefined [Go to Page]
European foreword
Endorsement notice
English [Go to Page]
CONTENTS
FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms, definitions and abbreviated terms [Go to Page]
3.1 Terms and definitions
3.2 Abbreviated terms
4 Mechanical design of the 0,4 cm3 coupler [Go to Page]
4.1 General [Go to Page]
4.1.1 Overall design guidelines
4.1.2 Acceptance limits
4.2 Cavity dimensions [Go to Page]
4.2.1 Critical dimensions
4.2.2 Effective coupler volume and cavity dimensions
4.3 Verification procedure of the effective coupler volume
4.4 Microphone [Go to Page]
4.4.1 General
4.4.2 Microphone type
4.5 Static pressure equalisation vent
4.6 Acoustic transfer impedance level
5 Calibration [Go to Page]
5.1 Reference environmental conditions
5.2 Method of calibration
Tables [Go to Page]
Table 1 – The acoustic transfer impedance level modulus and the associated acceptance intervals
6 Coupling of receivers and hearing aids to the coupler [Go to Page]
6.1 Coupling to a hearing aid receiver by means of tubing
6.2 Coupling to a hearing aid embedded in or connected to an earmould
Figures [Go to Page]
Figure 1 – Coupling to a hearing aid receiver by means of coupling tubing
6.3 Coupling to a receiver in the canal (RIC)
Figure 2 – Coupling to an ITE, ITC, or CIC
6.4 Coupling to a BTE hearing aid with 2 mm continuous internal diameter tubing
Figure 3 – Coupling to a receiver in the canal (RIC)
6.5 Coupling to a BTE hearing aid with earmould simulator
Figure 4 – Coupling to a BTE hearing aid with 2 mmcontinuous internal diameter coupling tubing
6.6 Coupling to a BTE hearing aid with thin acoustic coupling tubing
Figure 5 – Coupling to a BTE hearing aid with earmould simulator
7 Maximum permitted expanded uncertainty for coupler conformance testing [Go to Page]
Figure 6 – Coupling to a BTE hearing aid with thin coupling tubing
Figure 7 – Relationship between tolerance interval, corresponding acceptanceinterval and the maximum permitted uncertainty of measurement
Table 2 – Values of Umax for measurements
Annex A (informative)Example of a method for verification of the effective volume of the coupler [Go to Page]
A.1 Method for verification of the effective volume of the coupler
A.2 Measurement uncertainty
Figure A.1 – Measurement setup for coupler volume measurement
Table A.1 – Typical components of measurement uncertaintyin the measurement of effective volume
Annex B (informative)Example of a method for the measurement of the acoustictransfer impedance of the 0,4 cm3 coupler [Go to Page]
B.1 Measurement procedure [Go to Page]
B.1.1 Acoustic transfer impedance
B.1.2 Setup for measuring the coupler acoustic transfer impedance
B.2 Typical coupler acoustic transfer impedance
Figure B.1 – Test set-up for measuring the coupler acoustic transfer impedance
Figure B.2 – Typical coupler acoustic transfer impedance
Figure B.3 – Typical acoustic transfer impedance times frequency
Table B.1 – Typical acoustic transfer impedance values
B.3 Measurement uncertainty
Table B.2 – Typical components of measurement uncertaintyin the measurement of acoustic transfer impedance
Annex C (informative)Example of one specific design of the coupler [Go to Page]
Figure C.1 – Example of a specific design of the 0,4 cm3 coupler, shown with removable coupling plate with a nipple for the attachment of coupling tubing
Annex D (informative)Electrical analogue representation of the coupler as a tube model [Go to Page]
Figure D.1 – Electrical analogue of the coupler as a lossytransmission line tube with lossy terminations
Table D.1 – List of constants
Figure D.2 – Transfer impedance model vs. measurements
Figure D.3 – Equivalent volume calculated from the model vs. measurements
Figure D.4 – Model predictions of coupler impedance
Annex E (informative)Example assessments of conformance to specifications of this document [Go to Page]
E.1 General
E.2 Conformance criteria
E.3 Example test results
Table E.1 – Examples of assessment of conformance
Figure E.1 – Examples of assessment of conformance
Bibliography [Go to Page]

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BS EN IEC 60318-8:2022 Electroacoustics. Simulators of human head and ear - Acoustic coupler for high-frequency measurements of hearing aids and earphones coupled to the ear by means of ear inserts, 2022

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