BS EN IEC 60118-0:2024
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Electroacoustics. Hearing aids – Measurement of the performance characteristics of hearing aids
| Published By | Publication Date | Number of Pages |
| BSI | 2024 | 82 |
IEC 60118-0:2022 gives recommendations for the measurement of the performance characteristics of air conduction hearing aids measured with an acoustic coupler or occluded ear simulator. This document is applicable to the measurement and evaluation of the electroacoustical characteristics of hearing aids, for example for type testing and manufacturer data sheets. This document is also applicable for the measurement of the performance characteristics of hearing aids for production, supply and delivery quality-assurance purposes. The measurement results obtained by the methods specified in this document will express the performance under conditions of the measurement and can deviate substantially from the performance of the hearing aid under actual conditions of use. This document primarily uses an acoustic coupler according to IEC 60318-5 which is only intended for loading a hearing aid with specified acoustic impedance and is not intended to reproduce the sound pressure in a person’s ear. For measurements reflecting the output level in the normal human ear the occluded ear simulator according to IEC 60318-4 can be used. For extended high-frequency measurements and for deep insert hearing aids, the acoustic coupler according to IEC 60318-8 can be used. This document also covers measurement of hearing aids with non-acoustic inputs, such as wireless, inductive or electrical input. This document does not cover the measurement of hearing aids for simulated in situ working conditions, for which IEC 60118-8 can be applied. This document does not cover the measurement of hearing aids under typical user settings and using a speech-like signal, for which IEC 60118-15 can be applied. IEC 60118-0:2022 merges and updates the methods previously described in IEC 60118-0:2015 and IEC 60118-7:2005. It cancels and replaces the third edition of IEC 60118-0 published in 2015. This edition constitutes a technical revision. Measurements for quality control as described in IEC 60118-7:2005 can be found in Clause 10 of this document. This edition includes the following significant technical changes with respect to previous editions: a) the default use of an acoustic coupler according to IEC 60318-5, b) addition of the optional use of an occluded ear simulator according to IEC 60318-4, c) addition of the optional use of an acoustic coupler according to IEC 60318-8 (new standard based on IEC TS 62886) when information about the response above 8 kHz is needed, or the optional use of the acoustic coupler according to IEC 60318-8 for deep insert hearing aids, d) the addition of measurements of the performance of hearing aids for production, supply and delivery quality assurance purposes, e) corrected and updated measurement configuration and methods, adding the use of a sequential measurement as preferred configuration, f) updated and expanded measurement procedures for the non-acoustic inputs of the hearing aid.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | undefined |
| 7 | Annex ZA (normative)Normative references to international publicationswith their corresponding European publications |
| 8 | Annex ZZ (informative)Relationship between this European standard and the General Safety and Performance Requirements of Regulation (EU) 2017/745 aimed to be covered |
| 10 | English CONTENTS |
| 15 | FOREWORD |
| 17 | 1 Scope 2 Normative references |
| 18 | 3 Terms and definitions |
| 23 | 4 General conditions 4.1 Acoustic measurement method 4.2 Acoustic couplers and occluded ear simulator |
| 25 | 4.3 Input signals and frequency range 4.4 Reporting of data 5 Test equipment 5.1 General Tables Table 1 – Overview on the use of acoustic couplers and occluded ear simulator |
| 26 | 5.2 Test enclosure 5.2.1 General 5.2.2 Type 1 “anechoic-chamber” |
| 27 | 5.2.3 Type 2 “test-box” 5.3 Measurement configuration 5.3.1 General 5.3.2 Measurement configuration for non-directional hearing aids |
| 29 | Figures Figure 1 – Example of test arrangement for behind the ear hearing aid |
| 30 | 5.3.3 Measurement configuration for directional hearing aids Figure 2 – Example of test arrangement for in the ear hearing aid |
| 31 | 5.4 Sequential measurement method Figure 3 – Example of test arrangement for directional hearing aid |
| 32 | 5.5 Other measurement methods 5.6 Acoustic response measurement 5.7 Sound source system |
| 33 | 5.8 Measurement system for the sound pressure level and distortion produced by a hearing aid |
| 34 | 5.9 Electrical input 5.10 Direct-current measurement system 5.11 Magnetic field source for SPLIV measurements |
| 35 | 5.12 Magnetic field source for hearing aids having induction pick-up coil for use with a telephone 6 Normal operating conditions for a hearing aid 6.1 General Figure 4 – Telephone magnetic field simulator (TMFS) |
| 36 | 6.2 Battery or supply voltage 6.3 Settings of controls 6.3.1 General 6.3.2 Full-on setting (FOS) 6.3.3 Reference test setting (RTS) Table 2 – Resistors and open circuit voltages for zinc-air battery simulators |
| 37 | 6.4 Ambient conditions 6.5 Acoustical connection to the hearing aid 6.6 Accessories 7 Basic acoustic hearing aid measurements 7.1 General 7.2 Frequency response curves |
| 38 | 7.3 OSPL90 frequency response curve 7.4 Full-on gain frequency response curve Figure 5 – Example of OSPL90 curve and basic frequency response curve |
| 39 | 7.5 Basic frequency response curve 7.5.1 Test procedure 7.5.2 Frequency range of amplification |
| 40 | 7.5.3 Reference test gain (RTG) 7.6 Total harmonic distortion Figure 6 – Example of determination of frequency rangefrom basic frequency response curve |
| 41 | 8 Special hearing aid measurements 8.1 General 8.2 Difference frequency distortion 8.2.1 Difference frequency distortion products Table 3 – Distortion test frequencies and input sound pressure levels |
| 43 | 8.2.2 Total difference frequency distortion Figure 7 – Example of fundamental and difference frequency distortion products |
| 44 | 8.3 Equivalent input noise (EIN) Figure 8 – Example of total difference frequency distortion |
| 45 | 8.4 Equivalent input noise in one-third-octave bands (EIN-one-third-octave) |
| 46 | Figure 9 – Example of hearing aid acoustic gain Figure 10 – Example of hearing aid output noise and test equipment noise |
| 47 | 8.5 Measurements of AGC hearing aids 8.5.1 General 8.5.2 Steady-state input-output characteristics Figure 11 – Example of hearing aid equivalent input noise and ambient noise |
| 48 | 8.5.3 AGC characteristics (attack and release time) 8.6 Effects of tone control and gain control 8.6.1 Basic frequency response: effect of tone control 8.6.2 Frequency response: effect of gain control position Figure 12 – Example of a steady-state input-output characteristic |
| 49 | 8.6.3 Characteristics of the gain control 8.7 Battery related measurements 8.7.1 General 8.7.2 Battery current measurement 8.7.3 Effects of variation of battery or supply voltage and internal resistance |
| 50 | 9 Special measurements for hearing aids having non-acoustical inputs 9.1 General |
| 51 | 9.2 Equivalence of output levels for a non-acoustical input 9.3 Measurement setup for “Wireless” input (WL) 9.3.1 General 9.3.2 Measurement setup |
| 52 | 9.3.3 Wireless basic frequency response SPLWL 9.3.4 HFA-SPLWL 9.3.5 Frequency response with full-on setting 9.3.6 Equivalent wireless input sensitivity level (EWLS) Figure 13 – Measurement setup for wireless input |
| 53 | 9.4 Hearing aids with electrical input 9.4.1 General 9.4.2 Basic frequency response (SPLEI) 9.4.3 HFA-SPLEI 9.4.4 Frequency response with full-on setting 9.4.5 Equivalent electrical input sensitivity level (EEIS) 9.4.6 Connector system for electrical input |
| 54 | 9.5 Hearing aids having induction pick-up coil in a vertical magnetic field 9.5.1 General 9.5.2 Basic frequency response in a vertical magnetic field (SPLIV) 9.5.3 Frequency response with full-on setting (full-on SPLIV) 9.5.4 Effect of gain control position on frequency response |
| 55 | 9.5.5 Harmonic distortion 9.5.6 HFA-SPLIV 9.5.7 Equivalent test loop sensitivity level (ETLS) 9.5.8 Full-on HFA-SPLIV |
| 56 | 9.6 Hearing aids having induction pick-up coil for use with a telephone 9.6.1 SPLITS response curve 9.6.2 HFA-SPLITS Figure 14 – Example of hearing aids on TMFS for SPLITS test |
| 57 | 9.6.3 Relative simulated equivalent telephone sensitivity level (RSETS) 10 Measurement of performance characteristics for production, supply and delivery quality assurance purposes 10.1 General 10.2 Nominal characteristics |
| 58 | 10.3 Reference test gain 10.4 OSPL90 10.5 Full-on gain 10.6 Frequency response curve Table 4 – OSPL90: Acceptable deviation from the nominal values: Table 5 – Full-on gain: Acceptable deviation from the nominal value |
| 59 | 10.7 Bandwidth frequencies f1 and f2 Figure 15 – Example of tolerance limits and determinationof frequency range from basic frequency response curve Table 6 – Tolerances and acceptance intervals of the frequency response |
| 60 | 10.8 Battery or supply voltage 10.9 Battery current 10.10 Total harmonic distortion 10.11 Equivalent input noise level Table 7 – Battery current: Acceptable deviation from the nominal value Table 8 – Total harmonic distortion: Acceptable deviation from the nominal value Table 9 – Equivalent input noise level: Acceptable deviation from the nominal value |
| 61 | 10.12 Full-on HFA-SPLIV 10.13 Equivalent test loop sensitivity level (ETLS) 10.14 Relative simulated equivalent telephone sensitivity level (RSETS) 10.15 HFA-SPLITS 10.16 Equivalent electrical input sensitivity level (EEIS) Table 10 – Full-on HFA-SPLIV: Acceptable deviation from the nominal value Table 11 – ETLS: Acceptable deviation from the nominal value Table 12 – RSETS: Acceptable deviation from the nominal value Table 13 – HFA-SPLITS: Acceptable deviation from the nominal value |
| 62 | 10.17 Steady-state input-output AGC characteristics 10.18 Nominal attack time and release time 11 Maximum permitted expanded uncertainty of measurements Table 14 – EEIS: Acceptable deviation from the nominal value Table 15 – Acceptable deviation from the nominal valuesat input levels of 50 dB and 90 dB |
| 63 | Table 16 – Values of Umax for measurements |
| 64 | Figure 16 – Manufacturer acceptance interval (a) and purchaser acceptance interval (b) with tolerance and maximum permitted uncertainty Umax |
| 65 | Annex A (normative)Simultaneous measurement method A.1 General A.2 Measurement method A.3 Comparison of the simultaneous method |
| 66 | Annex B (normative)Substitution measurement method B.1 General B.2 Measurement method |
| 67 | B.3 Comparison of the substitution method Figure B.1 – Example of test arrangement for the substitution method |
| 68 | Annex C (normative)Effect of MLE on non-acoustic input hearing aids C.1 Acoustic and non-acoustic input equivalence |
| 69 | C.2 In situ equivalence measurement in the case of a known MLE Figure C.1 – Acoustic a) and non-acoustic b) transmission paths |
| 70 | C.3 HFA equivalence of output levels for non-acoustical inputs C.3.1 General Figure C.2 – Example of SPLIV equivalence for ITC |
| 71 | C.3.2 In situ output level equivalency of wireless input sensitivity level (EWLS) C.3.3 In situ output level equivalency of electrical input sensitivity level (EEIS) C.3.4 In situ output level equivalency of test loop sensitivity level (ETLS) Table C.1 – HFA-MLE for various styles of hearing aids |
| 72 | C.3.5 In situ output level equivalency of telephone sensitivity level (RSETS) |
| 73 | Annex D (informative)Examples of uncertainty calculation D.1 General D.2 Uncertainty calculations D.3 Sound source system for test-box |
| 74 | D.4 Sound source system for anechoic-chamber Table D.1 – Uncertainty sound source system for test-box Table D.2 – Uncertainty sound source system for anechoic-chamber |
| 75 | D.5 Hearing aid measurement Table D.3 – Uncertainty hearing aid measurement |
| 76 | Annex E (informative)Comparison of 2 cm3 coupler and 0,4 cm3 coupler E.1 General E.2 Influence of sound source impedance |
| 77 | Figure E.1 – Deviation from the normalized coupler volume ratio as functionof the effective source volume Vs |
| 78 | E.3 Comparison of frequency responses of the 0,4 cm3, the 2 cm3 coupler and the occluded ear simulator Figure E.2 – Magnitude frequency responses of acoustic impedance of the 2 cm3,the 0,4 cm3 coupler and various hearing aid types |
| 79 | Figure E.3 – Comparative measurement of the 0,4 cm3 coupler,the 2 cm3 coupler and the occluded ear simulator frequency responses |
| 80 | Bibliography |
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BS EN IEC 60118-0:2024
Electroacoustics. Hearing aids – Measurement of the performance characteristics of hearing aids Published By Publication…
