1、 ANSI/ASA S3.52-2016 AMERICAN NATIONAL STANDARD Measurements of the Threshold of Hearing and Signal Detectability in a Sound Field Accredited Standards Committee S3, Bioacoustics Standards Secretariat Acoustical Society of America 1305 Walt Whitman Road, Suite 300 Melville, NY 11747ANSI/ASAS3.52-201
2、6 The American National Standards Institute, Inc. (ANSI) is the national coordinator of voluntary standards development and the clearinghouse in the U.S.A. for information on national and international standards. The Acoustical Society of America (ASA) is an organization of scientists and engineers
3、formed in 1929 to increase and diffuse the knowledge of acoustics and to promote its practical applications. ANSI/ASA S3.52-2016 AMERICAN NATIONAL STANDARD Measurements of the Threshold of Hearing and Signal Detectability in a Sound Field Secretariat: Acoustical Society of America Approved on Januar
4、y 6, 2016 by: American National Standards Institute, Inc. Abstract The standard covers requirements, conditions, and procedures for threshold-of-hearing measurements in a sound field. However, the standard may also be used for conducting other sound-field hearing tests and as a research tool for ass
5、essing the effects of listening conditions and headgear worn by the listener on detectability of various test signals. Three sound fields are referenced in the standard: the free sound field, the quasi-free sound field, and the diffuse sound field. The test signals covered by the standard are freque
6、ncy-modulated tones (warble tones) and narrow-band noises. However, other calibrated signals that meet requirements of this standard may also be used. The standard applies to binaural Iistening to test signals presented by one or more loudspeakers in a test room. Monaural air conduction hearing thre
7、sholds may also be determined if the opposite ear can be properly occluded. Special application of the standard to the assessment of spatial hearing is presented in Annex B. ii 2016 Acoustical Society of America All rights reserved Annex A (Informative) Graphical display of sound field data 20 Annex
8、 B (Informative) Spatial audiometry . 21 Spatial detection 21 Spatial localization . 21 Annex C (Informative) Sound pressure level conversion . 23 General 23 Procedure for converting one-third octave and octave band sound level measurements into overall dB SPL 23 Conversion between dB (A), dB (C), a
9、nd dB HL for narrow-band sounds 23 Annex D (Informative) Hearing threshold for speech . 25 General 25 Speech detection threshold . 25 Speech recognition threshold 26 Figures Figure 1 Eight-louds peaker arrangement for conducting hearing tests in a sound field. 13 Tables Table 1 Allowable variation o
10、f sound-field sound pressure levels within each plane, for corresponding directional microphone free-field rejection 8 Table 2 Reference equivalent threshold sound pressure levels (RETSPLs) (dB re 20 Pa) for binaural listening in a sound field and the ear closest to the loudspeaker . 14 Table A.1 Gr
11、aphic symbols for sound field audiograms . 20 Table C.1 Correction in decib els for converting between sound pressure levels and hearing threshold levels expressed in dB (A), dB (C), or dB HL, respectively. . 24 Table D.1 Reference equivalent threshold sound pressure levels (RETSPLs) (dB re 20 Pa) f
12、or speech signals for binaural listening in a sound field and the ear closest to the loudspeaker (all values were rounded to the nearest 0.5 dB) . 26 2016 Acoustical Society of America All rights reserved iii Foreword This Foreword is for information only and is not a part of the American National S
13、tandard ANSI/ASA S3.52-2016 American National Standard Measurements of the Threshold of Hearing and Signal Detectability in a Sound Field. As such, this Foreword may contain material that has not been subjected to public review or a consensus process. In addition, it does not contain requirements ne
14、cessary for conformance to the standard. This standard comprises a part of a group of definitions, standards, and specifications for use in bioacoustics. It was developed and approved by Accredited Standards Committee S3 Bioacoustics, under its approved operating procedures. Those procedures have be
15、en accredited by the American National Standards Institute (ANSI). The Scope of Accredited Standards Committee S3 is as follows: Standards, specification, methods of measurements and test, and terminology in the fields of mechanical shock, and physical acoustics, including aspects of general acousti
16、cs, shock, and vibration that pertain to biological safety, tolerance, and comfort. At the time this Standard was submitted to Accredited Standards Committee S3, Bioacoustics for approval, the membership was as follows: C.J. Struck, Chair P.B. Nelson, Vice-Chair S.B. Blaeser, Secretary Acoustical So
17、ciety of America . C.J. Struck . P.B. Nelson (Alt.) American Academy of Audiology .C. Schweitzer . T. Ricketts (Alt.) American Academy of Otolaryngology, Head and Neck Surgery, Inc. .R.A. Dobie A. Kim (Alt.) American Industrial Hygiene Association T.K. Madison D. Driscoll (Alt.) American Speech-Lang
18、uage-Hearing Association (ASHA) . L.A. Wilber . N. DiSarno (Alt.) Beltone/GN Resound . S. Petrovic Council for Accreditation in Occupational Hearing Conservation (CAOHC) . B. Charlton B. Kirchner (Alt.) Diagnostic Group T. McColley . P. Dobrowski (Alt.) ETS Lindgren Acoustic Systems . S. Dunlap D. W
19、inker (Alt.) Etymotic Research, Inc. . M.C. Killion . J.K. Stewart (Alt.) Food and Drug Administration . S-C Peng iv 2016 Acoustical Society of America All rights reserved G.R.A.S. Sound FAX: 631-923-2875; E-mail: asastdsacousticalsociety.org. AMERICAN NATIONAL STANDARD ANSI/ASA S3.52-2016 2016 Acou
20、stical Society of America All rights reserved 1American National Standard Measurements of the Threshold of Hearing and Signal Detectability in a Sound Field 1 Scope 1.1 General This standard specifies relevant requirements for sound-field hearing tests conducted with the signals presented by means o
21、f loudspeakers in free, quasi-free, and diffuse sound fields. The requirements and conditions described in this standard are suitable for both frequency-specific hearing tests and assessment of detectability of wide-band signals. Two types of frequency-specific test signalsfrequency-modulated tones
22、and narrow-band noisesare described in the standard but other well-defined narrow- and wide-band test signals may also be used if the test conditions described in the standard are met. The main body of the standard specifies requirements for the measurement of the threshold of hearing. In addition,
23、Annex B provides information about extending requirements of this standard to spatial hearing audiometry and directional hearing tests conducted for research purposes. The requirements of the standard apply to hearing tests conducted in quiet. However, they also may serve as guidelines for similar s
24、ound tests conducted in the presence of other acoustic signals. If any form of acoustic masking or interference is introduced in the test, all specific information about the masking signals, their levels, and the delivery conditions shall be recorded and included with the test results. 1.2 Purpose T
25、he purpose of ANSI/ASA S3.52 is to ensure that sound field tests of hearing, and particularly tests of hearing threshold, performed on the same individual in various clinics and laboratories shall give accurate and reproducible results. The test conditions and test stimuli described in the standard
26、are applicable to all populations of subjects including children (play audiometry, visual-reinforced audiometry, and conditioned orientation reflex audiometry) and special listeners who do not tolerate earphones. 1.3 Applications The main application of the standard is determination of hearing thres
27、hold levels in the frequency range from the 125 Hz to 12500 Hz range with possible extension to the 20 Hz to 18000 Hz range. The standard applies to both sound field audiometry and sound field research studies based on measurement of hearing threshold. The requirements of the standard apply to measu
28、rements made with stationary systems consisting of signal-generating circuitry, such as an audiometer, and one or more loudspeakers. In addition to threshold of hearing measurements, the standard may be used to determine the effects of hearing aids (e.g., functional gain), assistive listening device
29、s, and various types of headgear on audibility of the test signals. The standard does not apply to sound field tests conducted with a handheld loudspeaker or conducted in virtual reality environments. Qualification tests for hearing protection devices should be made in accordance with ANSI/ASA S12.6
30、 and ANSI/ASA S12.42 standards. 2 Normative references The following referenced documents are indispensable for the application of this standard. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) app
31、lies. ANSI/ASA S3.52-2016 2 2016 Acoustical Society of America All rights reserved ANSI/ASA S1.1-2013 American National Standard Acoustical Terminology ANSI/ASA S1.4-2014/Part 1/IEC 61672-1:2013 American National Standard Sound Level Meters Part 1: Specifications (a nationally adopted international
32、standard) ANSI/ASA S1.11-2014/Part 1/IEC 61260-1:2014 American National Standard Electroacoustics - Octave-band and fractional-octave-band filters Part 1: Specifications ANSI/ASA S3.1-1999 (R 2013) American National Standard Maximum Permissible Ambient Noise Levels for Audiometric Test Rooms ANSI/AS
33、A S3.6-2010 American National Standard Specification for Audiometers ANSI/ASA S3.20-2015 American National Standard Bioacoustical Terminology ANSI/ASA S12.6-2008 American National Standard Methods for Measuring the Real-Ear Attenuation of Hearing Protectors ANSI/ASA S12.42-2010 American National Sta
34、ndard Methods for the Measurement of Insertion Loss of Hearing Protection Devices in Continuous or Impulsive Noise Using Microphone-in-Real-Ear or Acoustic Test Fixture Procedures IEC 60645-1: 2012 Electroacoustics - Audiometric equipment - Part 1: Equipment for pure-tone audiometry ISO 389-7:2005 A
35、coustics - Reference zero for the calibration of audiometric equipment - Part 7: Reference threshold of hearing under free-field and diffuse-field listening conditions ISO 389-7:2005/DAM1 Acoustics - Reference zero for the calibration of audiometric equipment - Part 7: Reference threshold of hearing
36、 under free-field and diffuse-field listening conditions - Amendment 1: Reference threshold of hearing at 20 Hz and 18 000 Hz under free-field listening conditions and at 20 Hz under diffuse-field listening conditions ISO 389-9:2009 Acoustics - Reference zero for the calibration of audiometric equip
37、ment - Part 9: Preferred test conditions for the determination of reference hearing threshold levels ISO 8253-2:1992 Acoustics - Audiometric test methods - Part 2: Sound field audiometry with pure tone and narrow-band test signals. ISO 26101-2012 Acoustics - Test methods for the qualification of fre
38、e-field environments 3 Terms and definitions For the purposes of this standard, the following terms and definitions apply. All listed definitions are technically equivalent to definitions given in ANSI/ASA S1.1 and ANSI/ASA S3.20 but some have editorial differences or have been expanded for the user
39、s of this standard. 3.1 test subject A person for whom the sound field audiometry test is conducted. ANSI/ASA S3.52-2016 2016 Acoustical Society of America All rights reserved 3 3.2 otologically normal person A person in a normal state of health who is free from all signs or symptoms of ear disease
40、and from excessive wax in the ear canal which would block incoming sound and who has no history of undue exposure to noise and potentially ototoxic drugs. 3.3 reference point (of the test subject) The midpoint of a straight line connecting the ear canal openings of the test subject (3.1) when the te
41、st subject is placed in the Iistening position in the sound field. 3.4 reference axis (of the loudspeaker) Axis perpendicular to the radiating surface of the loudspeaker. NOTE 1 For single radiator or horn loudspeakers, the axis passes through the geometric center of the diaphragm or the horn. NOTE
42、2 For multi-unit loudspeakers, the position of the axis is defined by the manufacturer. 3.5 test axis Reference axis of the test space indicating 0 azimuth and 0 elevation. 3.6 hearing threshold For a specific signal, the minimum sound pressure level that is capable of evoking an auditory sensation
43、for a specific test subject in a specific fraction of trials. NOTE Hearing threshold is typically determined as the lowest sound pressure level at which responses occur in 50 % of a series of trials. 3.7 reference equivalent threshold sound pressure level For a specific signal and a specified manner
44、 of signal presentation, value of the sound pressure level measured at the reference point (3.3) that corresponds to hearing threshold of a sufficiently large number of otologically normal persons (3.2), of both genders, aged between 18 years and 25 years inclusive, placed individually at the refere
45、nce point in the specific sound field. NOTE Reference equivalent threshold sound pressure level is abbreviated RETSPL. 3.8 hearing level For a specified signal and a specified manner of signal presentation, sound pressure level at the reference point (3.3) in the specific sound field minus the appro
46、priate reference equivalent threshold sound pressure level (3.7). 3.9 hearing threshold level For a specified signal and specified listening conditions, hearing threshold (3.6) expressed either as hearing level (3.8) or as sound pressure level. NOTE A graph of hearing threshold level expressed as he
47、aring level versus frequency is called an audiogram. ANSI/ASA S3.52-2016 4 2016 Acoustical Society of America All rights reserved 3.10 qualified tester A qualified tester is someone who has followed an appropriate course of instruction in the theory and practice of hearing testing either for clinica
48、l or research purposes. NOTE Tests conducted for medical or legal purpose require a qualified tester who holds appropriate licensure and/or certification relative to their discipline. 3.11 frequency-modulated tone (FM tone) Tone of periodically varying instantaneous frequency. NOTE 1 A frequency-mod
49、ulated tone is frequently referred to as FM tone or warble tone. NOTE 2 A frequency-modulated tone is characterized by its carrier waveform and modulating waveform. The frequency and amplitude of the modulating waveform define modulation rate and frequency deviation of the FM tone. 3.12 carrier frequency Average value of the frequency of the frequency-modulated tone (3.11). NOTE The carrier frequency is designated as the nominal test frequency. 3.13 modulation rate Frequency of changes of the periodically varying instantaneous frequency o
