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BS EN ISO 8253-3:2022

BS EN ISO 8253-3:2022

$198.66

Acoustics. Audiometric test methods – Speech audiometry

Published By Publication Date Number of Pages
BSI 2022 56
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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.

PDF Catalog

PDF Pages PDF Title
2 undefined
5 European foreword
Endorsement notice
11 Foreword
12 Introduction
13 1 Scope
2 Normative references
14 3 Terms and definitions
17 4 Requirements for recording of speech material
4.1 General requirements
4.2 Calibration signal
4.3 Reference recording
18 4.4 Recording environment
4.5 Recording setup
4.6 Signals and levels
4.6.1 Calibration signals
19 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
20 5 Validation of speech material recordings
5.1 General
5.2 Determination of reference speech recognition curve
21 5.3 Determination of perceptual equivalence of test lists
5.4 Determination of test-retest reliability
5.5 Documentation
22 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
23 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
24 9 Determination of speech detection threshold level
25 10 Determination of speech recognition threshold level
26 11 Determination of speech recognition scores
12 Contralateral masking
27 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
28 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
29 15 Measurement uncertainty
16 Maintenance and calibration of equipment
16.1 General
16.2 Stage A: Routine checking and listening tests
30 16.3 Stage B: Periodic electroacoustic tests
16.4 Stage C: Basic calibration tests
16.5 Intervals between tests
32 Annex A (informative) Example of speech materials
33 Annex B (informative) Examples of competing sound
34 Annex C (informative) Typical results
38 Annex D (informative) Optimization of perceptual equivalence of test lists
39 Annex E (informative) Measurement uncertainty
44 Annex F (informative) Determination of minimum number of subjects
46 Annex G (informative) Determination of test-retest reliability
51 Bibliography

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BS EN ISO 8253-3:2022
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