ISO 8253-3:2022
Acoustics — Audiometric test methods — Part 3: Speech audiometry
This document specifies basic methods for speech recognition tests for audiological applications.
NOTE Examples of speech materials are given in Annex A.
In order to ensure minimum requirements of precision and comparability between different test procedures including speech recognition tests in different languages, this document specifies requirements for the composition, validation and evaluation of speech test materials, and the realization of speech recognition tests. This document does not specify the contents of the speech material because of the variety of languages.
Furthermore, this document also specifies the determination of reference values and requirements for the realization and manner of presentation. In addition, there are features of speech tests described which are important to be specified, but which are not understood as a requirement.
This document specifies procedures and requirements for speech audiometry with the recorded test material being presented by an audiometer through a transducer, e.g., an earphone, bone vibrator, or loudspeaker arrangement for sound field audiometry. Methods for using noise either for masking the non-test ear or as a competing sound are described.
Some test subjects, for example children, can require modified test procedures not specified in this document.
Specialized tests, such as those used for evaluating directional hearing and dichotic hearing, are outside the scope of this document.
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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
10 Determination of speech recognition threshold level
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
13.4.3 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
16.3 Stage B: Periodic electroacoustic tests
16.4 Stage C: Basic calibration tests
16.5 Intervals between tests
Annex A (informative) Example of speech materials
Annex B (informative) Examples of competing sound
Annex C (informative) Typical results
Annex D (informative) Optimization of perceptual equivalence of test lists
Annex E (informative) Measurement uncertainty
Annex F (informative) Determination of minimum number of subjects
Annex G (informative) Determination of test-retest reliability
Bibliography
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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
10 Determination of speech recognition threshold level
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
13.4.3 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
16.3 Stage B: Periodic electroacoustic tests
16.4 Stage C: Basic calibration tests
16.5 Intervals between tests
Annex A (informative) Example of speech materials
Annex B (informative) Examples of competing sound
Annex C (informative) Typical results
Annex D (informative) Optimization of perceptual equivalence of test lists
Annex E (informative) Measurement uncertainty
Annex F (informative) Determination of minimum number of subjects
Annex G (informative) Determination of test-retest reliability
Bibliography