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Delivery: <= 4 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 4854.3-2022: Acoustics - Reference zero for the calibration of audiometric equipment - Part 3: Reference equivalent threshold vibratory force levels for pure tones and bone vibrators Status: Valid GB/T 4854.3: Historical versions
Basic dataStandard ID: GB/T 4854.3-2022 (GB/T4854.3-2022)Description (Translated English): Acoustics - Reference zero for the calibration of audiometric equipment - Part 3: Reference equivalent threshold vibratory force levels for pure tones and bone vibrators Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: A59 Word Count Estimation: 16,116 Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration GB/T 4854.3-2022: Acoustics - Reference zero for the calibration of audiometric equipment - Part 3: Reference equivalent threshold vibratory force levels for pure tones and bone vibrators---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order. Acoustics - Reference zero for the calibration of audiometric equipment - Part 3.Reference equivalent threshold vibratory force levels for pure tones and bone vibrators ICS 17.140 CCSA59 National Standards of People's Republic of China Replacing GB/T 4854.3-1998 Reference zero class for acoustic calibration of audiometric equipment Part 3.Bone Vibrator Pure Tone Benchmark Equivalent Threshold Vibration force level bonevibrators (ISO 389-3.2016, IDT) 2022-03-09 Released 2022-10-01 Implementation State Administration for Market Regulation Released by the National Standardization Administration directory Preface I Introduction III 1 Scope 1 2 Normative references 1 3 Terms and Definitions 2 4 Benchmark Equivalent Threshold Vibration Force Level 3 5 Test Conditions and Requirements 4 5.1 Overview 4 5.2 Bone Vibrator 4 5.3 Wearing the bone vibrator4 5.4 Force Coupler 4 5.5 Test Signal 4 5.6 Masking Noise 4 5.7 Masking transducer 4 5.8 Wearing of the masking transducer 4 5.9 Baseline Masking Level 4 Appendix A (Informative) Note 6 on the Numerical Calculation of Reference Equivalent Threshold Vibration Force Level Appendix B (Informative) Guidelines for Calibration of Bone Conduction Audiometers with Benchmark Zero Class 7 Appendix C (Informative) Example of the difference between the reference equivalent threshold vibration force levels of the bone vibrator between the forehead and mastoid parts 9 Appendix D (informative) Bone conduction hearing threshold for frequencies below 250Hz10 Reference 11 forewordThis document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1.Structure and Drafting Rules of Standardization Documents" drafted. This document is part 3 of GB/T 4854 "Reference zero level for acoustic calibration of audiometric equipment". GB/T 4854 has been released to Lower part. --- Part 1.In-ear headphones pure tone benchmark equivalent threshold sound pressure level; ---Equivalent Threshold Sound Pressure Level of Pure Tone Reference for Acoustic Insertion Headphones (GB/T 16402); --- Part 3.Bone vibrator pure tone benchmark equivalent threshold vibration force level; --- Part 4.Reference level for narrowband masking noise; --- Part 5.Pure tone benchmark equivalent threshold sound pressure level in the frequency range of 8kHz~16kHz; --- Part 6.Reference hearing thresholds for short-term test signals; --- Part 7.Benchmark hearing thresholds for free-field and diffuse-field audiometry; --- Part 8.Pure tone benchmark equivalent threshold sound pressure level for over-ear headphones; --- Part 9.Determine the preferred test conditions for the benchmark hearing threshold level. Note. The standard number of Part 2 of GB/T 4854 is GB/T 16402. This document replaces GB/T 4854.3-1998 "Benchmark Zero Class for Acoustic Calibration Audiometry Equipment Part 3.Bone Vibrator Pure Tone Benchmark, etc. Compared with GB/T 4854.3-1998, except for structural adjustment and editorial changes, the main technical changes are as follows. --- Deleted and added some normative references (see Chapter 2, Chapter 2 of the.1998 edition); --- Changed the following definitions. bone vibrator, force coupler, equivalent threshold vibration force level (monaural audiometry), reference equivalent threshold vibration force level, ear plugging effect, masking (process), masking amount, baseline masking level (see Chapter 3,.1998 edition 3.2, 3.4, 3.5, 3.6, 3.8, 3.9, 3.10); --- Changed the title of Chapter 4.Benchmark Equivalent Threshold Vibration Force Level (see Chapter 4, Chapter 4 of the.1998 edition); --- Changed the definition of the baseline masking level (see 5.9, 5.8 of the.1998 edition); --- Increased the interference sound in the bone vibrator (see B.3); --- Added the calibration method of the bone vibrator (see B.4); --- Changed the definition of masked noise source (see B.6, B.5 of the.1998 edition); --- Changed the description of the bone conduction hearing threshold for frequencies below 250Hz (see Appendix D, Appendix D of the.1998 edition). This document is equivalent to ISO 389-3.2016 "Benchmark zero class for acoustic calibration audiometric equipment Part 3.Bone vibrator pure tone benchmark, etc. Effective Threshold Vibration Force Level. Please note that some content of this document may be patented. The issuing agency of this document assumes no responsibility for identifying patents. This document is proposed and managed by the National Acoustic Standardization Technical Committee (SAC/TC17). This document is drafted by. Institute of Acoustics, Chinese Academy of Sciences, General Hospital of the Chinese People's Liberation Army, Qingdao University of Technology, Soochow University, Northwest China University of Technology. The main drafters of this document. Li Xiaodong, Sang Jinqiu, Lv Yadong, Cheng Xiaobin, Yu Ning, Liu Bilong, Dai Genhua, Xi Xin, Ji Fei, Tao Zhi, Hou Hong. The previous versions of this document and its superseded documents are as follows. ---First published in.1998 as GB/T 4854.3-1998; ---This is the first revision.IntroductionThe benchmark zero level for calibrating audiometry equipment is widely used in hearing diagnosis, hearing intervention, hearing rehabilitation, etc., and is an important basis for audiology. standard. The various parts of GB/T 4854 and GB/T 16402 stipulate the reference zero level for calibrating audiometric equipment, which consists of 9 parts. --- Part 1.In-ear headphones pure tone benchmark equivalent threshold sound pressure level. The purpose is to describe the use of in-ear headphones in conjunction with an acoustic coupling cavity The pure tone reference equivalent threshold sound pressure level at. --- Part 2.Plug-in earphone pure tone benchmark equivalent threshold sound pressure level (GB/T 16402). The purpose is to describe the The pure tone reference equivalent threshold sound pressure level when the acoustic coupling cavity is combined. --- Part 3.Bone vibrator pure tone benchmark equivalent threshold vibration force level. The purpose is to describe the pure tone base of the bone vibrator when used in conjunction with the mastoid Quasi-equivalent threshold vibration force level. --- Part 4.Reference level for narrowband masking noise. The purpose is to describe the role of masking and narrowband masking in pure tone audiometry Noise reference calibration method. --- Part 5.Pure tone benchmark equivalent threshold sound pressure level in the 8kHz~16kHz frequency range. The purpose is to describe the Pure tone benchmark equivalent threshold sound pressure level. --- Part 6.Reference hearing thresholds for short-term test signals. The purpose is to describe the baseline hearing threshold levels of short-duration test signals. --- Part 7.Benchmark hearing thresholds for free-field and diffuse-field audiometry. The purpose is to describe the benchmark for free-field and diffuse-field audiometry hearing threshold. --- Part 8.Over-ear headphones pure tone benchmark equivalent threshold sound pressure level. The purpose is to describe the use of over-ear headphones in conjunction with an acoustic coupling cavity The pure tone reference equivalent threshold sound pressure level at. --- Part 9.Determine the preferred test conditions for the benchmark hearing threshold level. The purpose is to specify the standard values for establishing the baseline hearing threshold level. Test conditions for determining the subject's hearing threshold. In clinical audiology testing programs, it is often necessary to compare a person's hearing threshold levels for air conduction and bone conduction. For this reason, bone conduction sound is delivered via an electric vibrator placed on the subject's mastoid or forehead. GB/T 4854.1, GB/T 16402 and GB/T 4854.8 respectively refer to various types of on-ear, plug-in and over-ear headphones The threshold sound pressure level generated inside the characteristic acoustic coupler defines the reference zero level for air conduction audiometry, that is, the reference equivalent threshold sound pressure level, corresponding to Hearing thresholds of guided audiometry in young otologic normal persons under electrical excitation. Similarly, this document defines the benchmark zero level for bone conduction audiometry, that is, the benchmark equivalent threshold. Vibration level. For example, the vibration force level produced by a bone vibrator mounted on a specific force coupler corresponds to a young normal ear under electrical excitation. Threshold for bone conduction audiometry. During bone conduction audiometry, bone vibrators are often placed on the mastoid or forehead. A standard with different values for each of the two parts, etc. Effective threshold vibration force level (see Appendix C). Bone conduction audiometry needs to specify the static force applied by the bone conductor to the subject's head or force coupler and certain geometric characteristics of the end face of the vibrator. this In addition, since the vibration of the bone vibrator may be heard by non-test ears, masking noise is often applied to it. Therefore, appropriate regulations for masking noise are required. as a supplement to the baseline equivalent threshold vibration force level. Due to the "clogging effect", the headphones provide noise masking that can cause noise to the non-test ear The bone conduction hearing threshold decreases, which requires increasing the sound level of masking noise to counteract the occlusion effect. Calibrating the audiometer with the reference zero level specified in this document will guarantee no hearing loss or purely sensorineural (i.e. outer and middle ear function) The bone conduction hearing threshold level measured by people with normal) hearing loss can be used with the same person as GB/T 4854.1, GB/T 16402 and GB/T 4854.8 The air conduction hearing threshold level measured by the benchmark zero level is consistent. Of course, due to biological variation in sound transmission through the outer, middle, and head, subjects It is unlikely that the air conduction thresholds and bone conduction thresholds of any individual among the subjects will agree precisely, but this document will guarantee the average systematic deviation of these subjects will be reduced to the minimum that can be used. This document is an ISO estimate based on technical data provided by laboratories in 3 countries using threshold test methods. Judging from the situation presented, the law is essentially the same. A review of the data showed that the trial results were consistent. Therefore, it is possible to benchmark the The equivalent threshold vibration force level is normalized to the reference zero level, which will be suitable for use in audiometry using bone vibrators with characteristics similar to those used in the laboratories described above. All bone vibrators. The system variation caused by this prudent simplification is comparable to the common span (5dB) used for audiometer control of clinical hearing levels. tiny. Reference zero class for acoustic calibration of audiometric equipment Part 3.Bone Vibrator Pure Tone Benchmark Equivalent Threshold Vibration force level1 ScopeThe following contents specified in this document are applicable to the calibration of bone vibrators for pure tone bone conduction audiometry. a) The reference equivalent threshold vibration force level, which corresponds to the hearing threshold of the bone conduction audiometry of the young normal ear; b) The basic characteristics of the bone vibrator and its coupling method with the subject and with the force coupler; c) Basic characteristics and reference levels of masked noise applied to non-test ears. Guidelines for practical use of this document in calibrating audiometers are given in Appendix B. The reference equivalent threshold vibration force level refers to the vibration force level transmitted through the vibrator to the force coupler with specific characteristics, and the value is equal to the specified vibration force level. Test conditions and vibration force levels evoked to induce normal hearing thresholds on the mastoid when the voltage is switched on. Note 1.Refer to Appendix C for the tentative difference between the reference equivalent threshold vibration force levels between the forehead and the mastoid. NOTE 2 Standard methods for conducting bone conduction audiometry have been specified in ISO 8253-1.2 Normative referencesThe contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, dated citations documents, only the version corresponding to that date applies to this document; for undated references, the latest edition (including all amendments) applies to this document. ISO 389-1 Benchmark zero level for acoustic calibration of audiometric devices - Part 1.In-ear headphone pure-tone reference equivalent threshold sound pressure level (Acoustics-Referencezero for the calibration of audiometric equipment-Part 1.Reference Note. GB/T 4854.1-2004 Benchmark Zero Level of Acoustic Calibration Audiometry Equipment Part 1.In-ear Headphone Pure Tone Benchmark Equivalent Threshold Sound Pressure Level (ISO 389-1.1998, IDT) ISO 389-2 Acoustically calibrated audiometric equipment, benchmark zero level - Part 2.Insertion-headphone pure-tone benchmark equivalent threshold sound pressure level (Acoustics-Referencezero for the calibration of audiometric equipment-Part 2.Reference Note. GB/T 16402-1996 Acoustic Insertion Headphone Pure Tone Benchmark Equivalent Threshold Sound Pressure Level (eqvISO 389-2.1994) ISO 389-4 Zero reference level for acoustic calibration of audiometric devices - Part 4.Reference level for narrowband masking noise (Acoustics- masking noise) Note. GB/T 4854.4-1999 Reference zero level for acoustic calibration audiometric equipment Part 4.Reference level for narrowband masking noise (eqvISO 389-4. 1994) IEC 60318-6 Electroacoustic head and ear simulators - Part 6.Mechanical couplers for bone vibrator measurements (Electro- bonevibrators) ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 4854.3-2022_English be delivered?Answer: Upon your order, we will start to translate GB/T 4854.3-2022_English as soon as possible, and keep you informed of the progress. The lead time is typically 2 ~ 4 working days. 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