Standard
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AS ISO 8253.3:2024
[Current]Acoustics - Audiometric test methods, Part 3: Speech audiometry
AS ISO 8253.3:2024 identically adopts ISO 8253.3, which specifies basic method for speech recognition tests for audiological applications.
Published: 26/04/2024
Pages: 39
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 Calibration signal
4.3 Reference recording
4.4 Recording environment
4.5 Recording setup
4.6 Signals and levels
4.6.1 Calibration signals
4.6.2 Speech signals
4.6.3 Announcing signals
4.6.4 Competing sound signals
4.7 Phonemic equivalence across test lists
4.8 Perceptual equivalence 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 test-retest reliability
5.5 Documentation
6 Requirements for speech audiometry
6.1 Audiometric equipment
6.2 Ambient sound pressure levels in test room for speech audiometry
6.3 Sound field speech audiometry
7 Preparation and instruction of test subject
7.1 General
7.2 Preparation of test subject
7.3 Instruction of test subject
8 Subject's response mode
9 Determination of speech detection threshold level
9.1
9.2
9.3
9.4
9.5
9.6
9.7
9.8
9.9
9.10
10 Determination of speech recognition threshold level
10.1
10.2
10.3
10.4
10.5
10.6
10.7.1
10.7.2
10.7.3
10.8.1
10.8.2
10.8.3
11 Determination of speech recognition scores
12 Contralateral masking
13 Speech audiometry with competing sound
13.1 Type of competing sound
13.2 Presentation of competing sound
13.3 Speech and competing sound levels
13.4 Test procedure
13.4.1 General
13.4.2 Speech recognition score at fixed SNR
13.4.2.1
13.4.2.2
13.4.2.3
13.4.3 Speech recognition threshold level with a competing sound
14 Format of speech audiogram
15 Measurement uncertainty
16 Maintenance and calibration of equipment
16.1 General
16.2 Stage A: Routine checking and listening tests
16.2.1
16.2.2
16.2.3
16.2.4
16.2.5
16.2.6
16.2.7
16.2.8
16.2.9
16.3 Stage B: Periodic electroacoustic tests
16.4 Stage C: Basic calibration tests
16.5 Intervals between 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 materials
A.5 Examples of closed-set sentence materials
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
C.4 Speech audiograms
Annex D
Annex E
E.1 General
E.2 Model function
E.3 Input quantities
E.3.1 General
E.3.2 Determined speech recognition threshold level, LHT′
E.3.3 Audiometric equipment, δeq
E.3.4 Transducers and their fitting, δtr
E.3.5 Masking and competing sound, δm
E.3.6 Impact 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
Annex F
Annex G
Bibliography
Cited references in this standard
[Current]
Electroacoustics — Audiometric equipment — Part 1: Equipment for pure-tone and speech audiometry
[Current]
Uncertainty of measurement — Part 3: Guide to the expression of uncertainty in measurement (GUM:1995) — SUPPLEMENT 2: Extension to any number of output quantities
[Current]
Acoustics — Audiometric test methods — Part 2: Sound field audiometry with pure-tone and narrow-band test signals
[Current]
Acoustics — Audiometric test methods — Part 1: Pure-tone air and bone conduction audiometry
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