Acoustics-Reference equivalent threshold sound pressure levels for pure tones and insert earphones
Some standard content:
GB/T 16402—1996
This standard is formulated based on the international standard ISO389-2:1994 Acoustics—Standard zero-level calibration of audiometric equipment Part 2: Pure tone reference equivalent network sound pressure level of insertable earphones. It is equivalent to this standard in terms of technical content. Compared with supine earphones, insert earphones used in audiometers can reduce adverse effects such as ear blockage and inter-ear conduction, and my country has begun to introduce them. The release of this standard will undoubtedly promote the development of audiometry in my country and international exchanges. Appendix A and Appendix B of this standard are both informative appendices. This standard is proposed and managed by the National Technical Committee for Acoustic Standardization. The drafting units of this standard are the Institute of Psychology, Chinese Academy of Sciences, the Institute of Ear and Throat, General Hospital of the Chinese People's Liberation Army, and the Institute of Acoustics, Chinese Academy of Sciences.
The main drafters of this standard are Fang Shi, Chen Hongwen, Dai Genhua, Gu Rui, and You Chunyan. GB/T164021996
ISO Foreword
I5O (International Organization for Standardization is IS) is a worldwide federation of national standards bodies of member countries. The development of international standards is usually carried out by ISO technical committees. Each member body interested in the subject determined by the technical committee has the right to participate in the committee. International organizations associated with ISO, whether official or unofficial, can also participate in the work. ISO works closely with the International Electrotechnical Commission (IEC) on all electrotechnical standards.
The draft international standards adopted by the technical committee are sent to the member bodies for voting. The publication of an international standard requires at least 75% of the votes of the member bodies.
International Standard ISO389-2 was drafted by ISO/TC43 Technical Committee on Acoustics. The general title of ISO389 is "Acoustics - Standard for calibration of audiometric equipment", which includes the following parts. Part 1: Reference equivalent sound pressure level of pure tone for on-ear headphones; Part 2: Reference equivalent sound pressure level of pure tone for insert earphones; Part 3: Reference equivalent sound pressure level of pure tone for bone instrument; Part 4: Reference level of narrow-band masking noise; Part 5: Reference equivalent sound pressure level of pure tone in the range of 8 to 16000 Hz; Part 6: Reference equivalent sound pressure level of short-tone test signal; Part 7: Reference hearing loss for free-field and diffuse-field audiometry. 1 Introduction
National Standard of the People's Republic of China
Acoustics-Reference equivalent threshold sound pressure levels for pure tones and insert earphones GB/T 16402-1996
eqIS0389-2:1994E)
National Standard GB4589-84 has specified the value of pure tone reference equivalent threshold sound pressure level (RETSPL) for over-ear headphones when used in conjunction with an acoustic coupling chamber.
In some audiometric experiments, in order to reduce adverse effects such as ear occlusion and inter-ear conduction, insert earphones are used to provide test signals or masking noises. The standard data of the equivalent threshold sound pressure level (RETSPL) of such headphones are specified in this standard. There are slight differences between the hearing threshold level results obtained by audiometric equipment using different types of headphones, namely over-ear and insert earphones. 2 Scope
This standard specifies the reference equivalent sound pressure level (RETSPL) for calibrating pure tone audiometers, which is a supplement to the provisions of GB 4589-84. The values specified in this standard apply to the plug-in machine models specified in Chapter 5. Note: For reference, Appendix A annotates the calculation of standard data and the source of input data. Appendix B is a reference document. 3 Reference standards
The texts contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised. All parties using this standard should explore the possibility of using the latest versions of the following standards. GB 4854-84 Acoustics - Standard zero level for calibration of pure tone audiometers SJ/Z.9144-87 IEC reference coupling chamber for measuring hearing aid earplugs SJ/Z9150-87 Occluded ear canal chamber simulator for measuring earplugs 4 Definitions
In addition to the definitions given in GB 4589-84, this standard also adopts the following definitions. 4.1 Ear insert
A device that couples the earphone to the ear canal. Examples of such earplugs may be an ear mold or a similar device with or without a coupling tube. 4.2 Insert earphone A small earphone that couples to the ear canal or stands on a coupling that inserts into the ear canal. The earplug may be part of an insert earphone. 4.3 Ear simulator
A device that measures the output sound pressure of an earphone in a specific frequency range and under specific load conditions. Basically, it consists of a main chamber, an acoustic network and a calibrated microphone. The position of the microphone should be selected so that its sound pressure level is equivalent to the sound pressure at the eardrum of the human ear. 4.4 Occluded-ear simulator National #
GB/T16402—1996
A simulator of the inner part of the external auditory canal between the inner end surface of the ear mold and the eardrum of the human ear, consisting of a main cavity with several acoustic load networks and a microphone for measuring the sound pressure level at the eardrum. Note: SJ/Z 915087 has made provisions for occluded-ear simulators. 4.5 Ear plug simulator Ear plug simulator is also called ear mold replacement or ear mold simulator, which simulates the plug at the end of the ear. The opening on its axis allows sound to enter the acoustic coupling cavity or occluded-ear simulator.
4.6 Acoustic coupling cavity for insert earphone Calibration of insert earphones A cavity with a specific shape and volume. It is used in conjunction with a standard microphone to measure the sound pressure in the cavity. Note: SJ/Z 9150--87 has made provisions for the acoustic coupling cavity of insert earphones. 5 Earphone Model
This standard applies to Etynotic Research ER-3A insert earphones that are connected to the human ear with ER-3-14 earplugs. Note
1 Eartone-3A insert earphones are the same as ER-3A insert earphones in all relevant aspects. 2 The trade name of ER-3-14 earplugs is also called EARlink 3A earplugs. The earplugs are foam plastic heads with a nominal length of 12mm and a nominal diameter of 13mm. It contains a plastic tube with a nominal inner diameter of 1.9mm. Its effective length from the end of the foam head to the sound tube joint is 22mm. The sound tube joint has a nominal length of 11mm and an inner diameter of 1.9mm. It connects the earplug to the output end of the insert earphone through a sound tube with an effective length of 240mm and an inner diameter of 2mm from the end of the joint to the output end of the earphone.See Figure 1. The earplug should be inserted into the ear canal so that the outer end of the foam tip is 2 to 3 meters inside the ear canal opening. 6 Reference equivalent muffled sound pressure level of pure sound for insert earphones The reference equivalent muffled sound pressure level (REISPL) of the earphones specified in Chapter 5 in the acoustic coupling chamber conforming to SJ/Z9144-87, or in the blocked ear simulator conforming to SJ/Z9150-87 is listed in Table 1. Using these values, the insert earphone sound tube connector should be tightly combined with the acoustic coupling chamber conforming to SJ/Z9144-87, or with the blocked ear simulator conforming to SJ/Z9150-87 through a plastic tube as shown in Figure 2. The total effective length of the joint between the output end of the insert earphone and the simulated earplug is set to 251mm.
Note: If the insert earphones of the audiometer are different from those specified in Chapter 5, the corresponding base-tested equivalent sound pressure level (RETSPL>) value should be determined by the procedure specified in the standard zero level for calibration of pure tone audiometers in GB 485484. 16402Www.bzxZ.net
ER-3-1 home
ER-3A auxiliary insert earphone
Unit: mm
Figure 1 ER-3-14 earplug and its coupling with ER-3A insert earphone) sound cavity
GB/T16402—1996
ER3A insert earphone
Intelligent joint
Tube period assembly
Ear separation simulator
Out-coupling cavity
ER-3A insert earphone
Vocal cord joint
Tube assembly
Ear case simulator
Blocked opening simulation cutoff
Unit:
) Blocked ear simulator
Figure 2 Insert earphone and acoustic coupling cavity or blocked ear simulator2
GB/T 16402-1996
Table 1 Reference equivalent valve sound level in the acoustic coupling cavity that complies with SJ/Z9144-87 and the blocked ear simulator that complies with SJ/Z9150-87 Reference equivalent valve sound pressure level (0d=20uPa) Ratio
3150*+
* is the nearest value of 0.5 dB;
* is the number obtained by interpolation of these ratios.
Acoustic coupling decoupling
(SJ/Z914487)
Occluded ear simulator
(SJ/Z9150--87)
GB/T 16402—1996
Appendix A
(Suggestive Appendix)
Reference equivalent explanatory sound pressure level (RETSPL> Numerical calculation Notes The RETSPL values specified in this standard are derived from the results of an independent experimental study submitted to &ISO/TC43 Acoustics. Brief characteristics of these tests are listed in Table A1. Details on the tests and the test subjects are given in the references cited in Appendix B. The insert earphone reading value data used in this standard do not correct the deviation between the test subject's listening level and the 0dB measured by the standard earphone. REISPL The data are calculated by averaging the data of three studies. The difference in the number of people tested has not been processed. Table A1 Supplementary information on RETSPL values
Test data
Test headphone model
Test method
Standard headphone model
Number of ears tested
Number of people tested
Test frequency
Hearing level of the person being tested
Insertion type, headphone used for the test chamber
ER-3A insertion headphone that meets the requirements of Section 5 Hearing threshold method Use standard headphone to check the normal hearing of the person being tested Telephonies
TDH 39
1 000.2 000
300,4000
Telephonics
TDH 39
125.250.500
3 600.4 000
6000,8000
Any test frequency below 4 000 Hz ≤10 dB4 000 IIz and test frequency above 4 000 Hz 15 dSJ/Z91418
SJ/Z914487
SJ/Z 9150 -87
125.250.315,500.630
750,1 000.1 250.1 500,
2 000.2 500,3 500,4 000
5000,6000,630,8
8? Figure 2
SJ/Z 9144 | | tt | 83(2),1988.pp.669-676.2. Arlinger,S. and Kinnefors,C, Reference equivalent threshold sound presbure levels for insertearphones. Acustica, 70. 1990. pp. 202-207.4. ISO 38g-4, Acoustics--Reference zeru for the calibration of audiometric equipment-Part 4:Reference levels for narrowband masking noise.5. IEC 303:1970,IEC provisional reference coupler for the calibration af earphones in audiometry.
6, IEC 318:1970,An IEC artificial ear,of the wideband type,for the calibration of earphones used in audiometry.
* This paper is a synthesis of 5 groups of experimental studies, but ISO 389-2:1994(E) only used the results of one study, Wilber 1986, because the test parameters of the other studies were different.Table A1 Supplementary information on RETSPL values
Test data
Test earphone model
Test method
Standard earphone model
Number of ears tested
Number of people tested
Test frequency
Hearing level of person being tested
Insertion type, earphone used for matching cavity
ER-3A insertion earphone that meets the requirements of Section 5 Hearing threshold method Use standard earphone to check the normal hearing of the person being tested Telephonies
TDH 39
1 000.2 000
300,4000
Telephonics
TDH 39
125.250.500
3 600.4 000
6000,8000
Any test frequency below 4 000 Hz ≤10 dB4 000 IIz and test frequency above 4 000 Hz 15 dSJ/Z91418
SJ/Z914487
SJ/Z 9150 -87
125.250.315,500.630
750,1 000.1 250.1 500,
2 000.2 500,3 500,4 000
5000,6000,630,8
8? Figure 2 | | tt | .Acoust.Soc.Amer.+83(2),1988.pp.669-676.2. Arlinger,S. and Kinnefors,C, Reference equivalent threshold sound presbure levels for insertearphones. Scand, Audiol. 18,1989.Pp.195—196.3. Brinkmann, K, and Richter,U, Reference zero for the calibration of pure tone audiometers t.quipped with inesert earphones. Acustica, 70. 1990. pp. 202-207.4. Is0 38g-4, Acoustics--Reference zeru for the calibration of audiometric equipment-Part 4:Reference levels for narrowband masking noise.5. IEc 303:1970,IEC provisional reference coupler for the calibration af earphones in audiometry.
6, IEC 318:1970,An IEC artificial ear,of the wideband type,for the calibration of earphones used in audiometry.
* This paper is a synthesis of 5 groups of experimental studies, but Is0 389-2:1994(E) only used the results of one study, Wilber 1986, because the test parameters of the other studies were different.Table A1 Supplementary information on RETSPL values
Test data
Test earphone model
Test method
Standard earphone model
Number of ears tested
Number of people tested
Test frequency
Hearing level of person being tested
Insertion type, earphone used for matching cavity
ER-3A insertion earphone that meets the requirements of Section 5 Hearing threshold method Use standard earphone to check the normal hearing of the person being tested Telephonies
TDH 39
1 000.2 000
300,4000
Telephonics
TDH 39
125.250.500
3 600.4 000
6000,8000
Any test frequency below 4 000 Hz ≤10 dB4 000 IIz and test frequency above 4 000 Hz 15 dSJ/Z91418
SJ/Z914487
SJ/Z 9150 -87
125.250.315,500.630
750,1 000.1 250.1 500,
2 000.2 500,3 500,4 000
5000,6000,630,8
8? Figure 2 | | tt | .Acoust.Soc.Amer.+83(2),1988.pp.669-676.2. Arlinger,S. and Kinnefors,C, Reference equivalent threshold sound presbure levels for insertearphones. Scand, Audiol. 18,1989.Pp.195—196.3. Brinkmann, K, and Richter,U, Reference zero for the calibration of pure tone audiometers t.quipped with inesert earphones. Acustica, 70. 1990. pp. 202-207.4. Is0 38g-4, Acoustics--Reference zeru for the calibration of audiometric equipment-Part 4:Reference levels for narrowband masking noise.5. IEc 303:1970,IEC provisional reference coupler for the calibration af earphones in audiometry.
6, IEC 318:1970,An IEC artificial ear,of the wideband type,for the calibration of earphones used in audiometry.
* This paper is a synthesis of 5 groups of experimental studies, but Is0 389-2:1994(E) only used the results of one study, Wilber 1986, because the test parameters of the other studies were different.
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.