ISO 8253-3:2012
Acoustics — Audiometric test methods — Part 3: Speech audiometry
ISO 8253-3:2012 specifies basic methods for speech recognition tests for audiological applications.
In order to ensure minimum requirements of precision and comparability between different test procedures including speech recognition tests in different languages, ISO 8253-3:2012 specifies requirements for the composition, validation and evaluation of speech test materials, and the realization of speech recognition tests. ISO 8253-3:2012 does not specify the contents of the speech material because of the variety of languages.
Furthermore, ISO 8253-3:2012 also specifies the determination of reference values and fulfilment requirements for the realization and manner of presentation.
ISO 8253-3:2012 specifies procedures and requirements for speech audiometry with the recorded test material being presented by air conduction through an earphone, or from a loudspeaker 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 amended test procedures not specified in ISO 8253-3:2012.
Specialized tests such as those used for evaluating directional hearing and dichotic hearing are outside the scope of ISO 8253-3:2012.
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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 Reference recording
4.3 Recording environment
4.4 Frequency response of recording equipment
4.5 Interval between successive test items
4.6 Levels
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
12 Determination of speech recognition threshold level
12.1 General
12.2 Descending procedure using 5 dB steps
12.3 Alternative descending procedure
12.4 Adaptive procedure using fixed step sizes
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
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
18.4 Stage B: Periodic electroacoustic tests
18.5 Stage C: Basic calibration tests
Annex A (informative) Example of speech materials
Annex B (informative) Examples of competing sound conditions
Annex C (informative) Typical results
Annex D (informative) Optimization of perceptual balance of test lists
Annex E (informative) Measurement uncertainty
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 Reference recording
4.3 Recording environment
4.4 Frequency response of recording equipment
4.5 Interval between successive test items
4.6 Levels
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
12 Determination of speech recognition threshold level
12.1 General
12.2 Descending procedure using 5 dB steps
12.3 Alternative descending procedure
12.4 Adaptive procedure using fixed step sizes
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
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
18.4 Stage B: Periodic electroacoustic tests
18.5 Stage C: Basic calibration tests
Annex A (informative) Example of speech materials
Annex B (informative) Examples of competing sound conditions
Annex C (informative) Typical results
Annex D (informative) Optimization of perceptual balance of test lists
Annex E (informative) Measurement uncertainty
Bibliography