Standard
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AS/NZS ISO 8253.3:2019
[Superseded]Acoustics - Audiometric test methods, Part 3: Speech audiometry
The objective of this Standard is to specify basic methods for speech recognition tests for audiological applications.
Published: 11/03/2019
Pages: 32
Table of contents
Cited references
Content history
Table of contents
Header
About this publication
Preface
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Requirements for recording of speech material
4.1 General requirements
4.2 Reference recording
4.3 Recording environment
4.4 Frequency response of recording equipment
4.5 Interval between successive test items
4.6 Levels
4.6.1 Speech material
4.6.2 Calibration signal
4.7 Signal-to-noise ratio
4.8 Phonemic balance across test lists
4.9 Perceptual balance across test lists
5 Validation of speech material recordings
5.1 General
5.2 Determination of reference speech recognition curve
5.3 Determination of perceptual equivalence of test lists
5.4 Determination of repeatability of results (average test-retest reliability)
5.5 Documentation
6 Requirements for speech audiometry
7 Ambient sound pressure levels in test room for speech audiometry
8 Sound field speech audiometry
9 Preparation and instruction of test subject
9.1 General
9.2 Preparation of test subject
9.3 Instruction of test subject
10 Subject's response mode
11 Determination of speech detection threshold level
11.1
11.2
11.3
11.4
11.5
11.6
11.7
11.8
11.9
12 Determination of speech recognition threshold level
12.1 General
12.1.1
12.1.2
12.1.3
12.1.4
12.2 Descending procedure using 5 dB steps
12.2.1
12.2.2
12.2.3
12.3 Alternative descending procedure
12.3.1
12.3.2
12.3.3
12.3.4
12.3.5
12.3.6
12.3.7
12.4 Adaptive procedure using fixed step sizes
12.4.1
12.4.2
12.4.3
12.4.4
12.4.5
12.4.6
12.4.7
12.4.8
12.4.9
12.4.10
12.4.11
12.4.12
12.5 Other adaptive procedure
13 Determination of speech recognition scores
14 Contralateral masking
15 Speech audiometry with competing sound
15.1 Type of competing sound
15.2 Presentation of competing sound
15.3 Speech and competing sound levels
15.4 Test procedure
15.4.1 General
15.4.2 Speech recognition score at fixed speech-to-noise ratio
15.4.2.1
15.4.2.2
15.4.2.3
15.4.3 Speech recognition threshold with a competing sound
15.4.3.1 General
15.4.3.1.1
15.4.3.1.2
15.4.3.1.3
15.4.3.2 Procedure to decrease speech-to-noise ratio using 5 dB steps
15.4.3.2.1
15.4.3.2.2
15.4.3.3 Alternative procedure to decrease speech-to-noise ratio
15.4.3.3.1
15.4.3.3.2
15.4.3.3.3
15.4.3.3.4
15.4.3.3.5
15.4.3.3.6
15.4.3.3.7
16 Format of speech audiogram
17 Measurement uncertainty
18 Maintenance and calibration of equipment
18.1 General
18.2 Intervals between tests
18.3 Stage A: Routine checking and listening tests
18.3.1
18.3.2
18.3.3
18.3.4
18.3.5
18.3.6
18.3.7
18.3.8
18.3.9
18.4 Stage B: Periodic electroacoustic tests
18.5 Stage C: Basic calibration tests
Annex A
A.1 General
A.2 Examples of open-set materials
A.3 Examples of closed-set materials
A.4 Examples of open-set sentence tests
A.5 Examples of closed-set sentence tests
Annex B
B.1 General
B.2 Non-modulated noises
B.3 Modulated noises
B.4 Babble noises
Annex C
C.1 Typical reference speech recognition curves
C.2 Typical speech recognition threshold levels
C.3 Typical test-retest reliabilities
Annex D
Annex E
E.1 General
E.2 Model function
E.3 Input quantities
E.3.1 General
E.3.2 Determined hearing threshold level, LHT′
E.3.3 Audiometric equipment, δeq
E.3.4 Transducers and their fitting, δtr
E.3.5 Masking and competing noise, δm
E.3.6 Experience of the tester, δte
E.3.7 Responses of the test subject, δsu
E.3.8 Special measurement situations, δpr
E.3.9 Different performance of the test material, δtm
E.3.10 Environmental conditions, δn
E.3.11 Test method used, δmth
E.4 Uncertainty budget
E.5 Combined and expanded uncertainty
E.6 Example
Bibliography
Cited references in this standard
Content history
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[Superseded]
[Superseded]
DR AS ISO 8253.3:2018
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