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GB/T 20242-2025 English PDF

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GB/T 20242-2025: Acoustics - Measurement of real-ear acoustical performance characteristics of hearing aids
Status: Valid

GB/T 20242: Evolution and historical versions

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GB/T 20242-2025English594 Add to Cart 5 days [Need to translate] Acoustics - Measurement of real-ear acoustical performance characteristics of hearing aids Valid GB/T 20242-2025
GB/T 20242-2006English354 Add to Cart 3 days [Need to translate] Acoustics -- Procedures for the measurements of real-ear acoustical characteristics of hearing aids Valid GB/T 20242-2006

Standard similar to GB/T 20242-2025

GB/T 51033   GB/T 50082   

Basic data

Standard ID GB/T 20242-2025 (GB/T20242-2025)
Description (Translated English) Acoustics - Measurement of real-ear acoustical performance characteristics of hearing aids
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard A59
Classification of International Standard 17.140
Word Count Estimation 30,313
Date of Issue 2025-08-01
Date of Implementation 2026-02-01
Older Standard (superseded by this standard) GB/T 20242-2006
Issuing agency(ies) State Administration for Market Regulation, Standardization Administration of China

GB/T 20242-2025: Acoustics - Measurement of real-ear acoustical performance characteristics of hearing aids


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ICS 17.140 CCSA59 National Standard of the People's Republic of China Replaces GB/T 20242-2006 Measurement of real-ear acoustic performance characteristics of acoustic hearing aids (IEC 61669.2015,Electroacoustics-Measurementofreal-ear Released on August 1, 2025 Implementation on February 1, 2026 State Administration for Market Regulation The National Standardization Administration issued

Table of Contents

Preface III Introduction IV 1 Scope 1 2 Normative references 1 3 Terms and Definitions 2 4 Test setup diagram 5 5 Limitations 7 6 Test Equipment 7 6.1 Safety Requirements 7 6.2 Environmental Requirements 8 6.3 Test Signal 8 6.4 Sound Field Source 8 6.5 Coupled Sound Sources 8 6.6 Test Signal Range 8 6.7 Test signal level indication 8 6.8 Balance 9 6.9 Frequency 9 6.10 Harmonic Distortion 9 6.11 Probe Microphone Measurement 9 6.12 Noise Floor Measurements with Probe Microphones 9 6.13 Attenuation of the probe microphone relative to external signals 9 6.14 Analytical Characteristics 9 6.15 Output Reading 9 6.16 Graphical Printout 10 7 Test Conditions 10 7.1 Test area environmental conditions 10 7.2 Background Noise 10 7.3 Acoustic properties 10 7.4 Sound Field Characteristics 10 7.5 Calibration 10 7.6 Balance 10 7.7 Test Signal Level 11 7.8 Subject Position 11 7.9 Tester Position 11 7.10 Sound Field Reference Point Position 11 7.11 Measurement point location 11 7.12 Guidance to Subjects 12 7.13 Wearing and coupling of hearing aids 12 7.14 Operating conditions of hearing aids 12 8 Measurement 12 8.1 Overview 12 8.2 Real Ear Unaided Response (REUR) Curve 12 8.3 Real Ear Unaided Gain (REUG) Curve 12 8.4 Real Ear Occlusion Response (REOR) Curve 12 8.5 Real Ear Occlusion Gain (REOG) Curve 13 8.6 Real Ear Response (REAR) Curve 13 8.7 Real Ear Aid Gain (REAG) Curve 13 8.8 Real Ear Insertion Gain (REIG) Curve 13 8.9 Real Ear and Coupler Cavity Difference (RECD) Curve 13 8.10 Real Ear and Audiometer Reading Difference (REDD) Curve 13 9 Measurement uncertainty for performance requirements in Chapter 6 14 Appendix A (Informative) Placement of the Probe Sound Pickup Hole at the Measurement Point 15 A.1 Overview 15 A.2 Visual Placement 15 A.3 Acoustic Assisted Placement 15 A.4 Sound Placement --- Method 1 15 A.5 Sound Placement --- Method 2 15 A.6 Geometry Placement 16 Appendix B (Informative) Issues Related to RECD Measurement and Application 17 B.1 Overview 17 B.2 Influence of coupled sound sources 17 B.3 Estimation of the sound pressure level produced by a hearing aid in the ear canal 19 B.4 Correction of audiograms obtained with insert earphones and standard earplugs 21 B.5 Correction of audiograms obtained using insert earphones and custom earmolds22 Appendix C (Informative) Relationship between the allowable interval, the corresponding acceptance interval and the maximum allowable measurement uncertainty 23 Reference 24 Preface This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents" Drafting. This document replaces GB/T 20242-2006 "Methods for measuring the acoustic characteristics of real ears for hearing aids". In addition to structural adjustments and editorial changes, the main technical changes are as follows. --- Added the definition and test method of the real ear and coupler cavity difference (RECD) (see 3.37, 8.9); --- Added the definition and test method of the real ear and audiometer reading difference (REDD) (see 3.38, 8.10); --- Added the International Speech Test Signal (ISTS) as the preferred speech-like test signal (see Chapter 6). This document is equivalent to IEC 61669.2015 "Methods for measuring the real-ear acoustic characteristics of electroacoustic hearing aids". The following minimal editorial changes have been made to this document. --- To be consistent with the existing standard series, the name of the standard is changed to "Measurement of Real Ear Acoustic Characteristics of Acoustic Hearing Aids". --- This document incorporates the amendments to IEC 61669.2015/Amd1.2025.The outer margins of the clauses involved are marked with Vertical double lines (‖) are marked. Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents. This document is proposed and coordinated by the National Technical Committee on Acoustics Standardization (SAC/TC17). This document was drafted by. The Sixth Medical Center of the General Hospital of the Chinese People's Liberation Army, Institute of Acoustics of the Chinese Academy of Sciences, China Institute of Metrology Research Institute, the Third Research Institute of China Electronics Technology Group Corporation, East China Normal University, Beijing Children's Hospital Affiliated to Capital Medical University, Capital Medical University Beijing Tongren Hospital affiliated to Xi'an Jiaotong University, Ertingmei Medical Equipment (Shanghai) Co., Ltd., Wuhan Jinhua Zhisheng Hearing Technology Co., Ltd., Xi'an Jiaotong University The Second Affiliated Hospital of University of Science and Technology, Hangzhou Huier Hearing Technology Equipment Co., Ltd., and Hangzhou Aihua Intelligent Technology Co., Ltd. The main drafters of this document are. Ji Fei, Wang Qian, Liu Jing, Qiu Xiangyu, Chen Aiting, Zheng Chengshi, Li Xiaodong, Cheng Xiaobin, Cui Jian, Wu Xin, Zhong Bo, Sang Jinqiu, Zuo Huijun, Han Lumeng, Wu Qian, Li Nan, Liu Haihong, Wang Shuo, Huang Yuntian, Guang Huaping, Hu Juan, Shi Wendi, and Xiong Wenbo. The previous versions of this document and the documents it replaces are as follows. ---First published in.2006 as GB/T 20242-2006; ---This is the first revision.

introduction

Since hearing aids are affected by the acoustic characteristics and coupling characteristics of the human ear during actual use, their acoustic performance characteristics are different from those of the human ear. The performance characteristics defined in GB/T 25102.100 and GB/T 25102.7 are very different. Therefore, when fitting different hearing aid wearers, When measuring the coupling characteristics and acoustic effects, it is very important to use a measurement method that takes into account the coupling characteristics and acoustic effects. This measurement method is called "real ear measurement" and it is sometimes used in non-ideal The accuracy and repeatability of measurements made under these conditions are affected by the following factors. the sound field, the test environment, environment, test signal characteristics, the hearing aid to be evaluated, test signal control methods, sound field source locations, and characteristics of data acquisition, analysis, and presentation, and The subject was allowed a range of motion. This document provides the terms and definitions used in the measurement of the real-ear acoustic performance characteristics of hearing aids and proposes the standards for the test procedure and result reporting. The format is fixed, which specifies the necessary characteristics provided by the equipment manufacturer for real ear measurement and describes the tolerances for sound pressure level control and measurement. Where possible, the source of the error is identified and suggested solutions are provided. Measurement of real-ear acoustic performance characteristics of acoustic hearing aids

1 Scope

This document specifies the methods for measuring and evaluating the real-ear acoustic performance characteristics of air conduction hearing aids, as well as for measuring the specific acoustic characteristics of the human ear relevant to hearing aid applications. Property recommendations and requirements. The results of real ear acoustic characteristics measurements of hearing aids using nonlinear or analytical processing techniques are only valid for the test signals and test The test conditions are valid. The purpose of this document is to ensure that the real-ear acoustic performance characteristics of a given hearing aid are measured on a given human ear, using other test equipment and test The results were reproducible across locations.

2 Normative references

The contents of the following documents constitute the essential clauses of this document through normative references in this document. For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to This document. Note. GB/T 3240-1982 Frequencies commonly used in acoustic measurements (ISO 266.1975, NEQ) terms) IEC 60318-5 Electroacoustics Head and ear simulators Part 5.Measurement of hearing aids and ear simulators coupled to the human ear Note. GB/T 25498.5-2017 Electroacoustics Head and Ear Simulators Part 5.Measurement of Hearing Aids and Hearing Aids Coupled to the Human Ear 2cm3 acoustic coupling cavity for headphones (IEC 60318-5.2006, IDT) IEC 60601-1 Medical electrical equipment Part 1.General requirements for basic safety and essential performance Note. GB 9706.1-2020 Medical electrical equipment Part 1.General requirements for basic safety and essential performance (IEC 60601-1.2012, IDT) IEC 60601-1-2 Medical electrical equipment Part 1-2.General requirements for basic safety and essential performance Collateral standard. Electromagnetic compatibility IEC 60942 Electroacoustics-Soundcalibrators Note. GB/T 15173-2010 Electroacoustic sound calibrators (IEC 60942.2003, IDT) IEC 61260-1 Electroacoustics - Octave-band and fractional-octave-band filters - Part 1.Specifications Note. GB/T 3241.1-2025 Electroacoustics Octave and fractional octave filters Part 1.Specification (IEC 61260-1.2014 Electroa- coustic-Octave-bandandfractional-octave-bandfilters-Part 1.Specifications,IDT)

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