ISO 8253-2:2009
Acoustics — Audiometric test methods — Part 2: Sound field audiometry with pure-tone and narrow-band test signals
ISO 8253-2:2009 specifies relevant test signal characteristics, requirements for free, diffuse, and quasi‑free sound fields, and procedures for sound field audiometry using pure tones, frequency-modulated tones or other narrow-band test signals presented by means of one or more loudspeakers. The primary purpose is the determination of hearing threshold levels in the frequency range 125 Hz to 8 000 Hz, but this range can be extended to 20 Hz to 16 000 Hz.
ISO 8253-2:2009 does not include specifications for the use of hand-held loudspeakers. Speech as a test signal is not covered.
The purpose of ISO 8253-2:2009 is to ensure that tests of hearing, using sound field audiometry, give as high a degree of accuracy and reproducibility as possible.
Examples of graphical representations of the results are given.
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Scope
Normative references
Terms and definitions
Test signal characteristics
General
Pure tones
FM tones
Narrow bands of noise
Harmonic distortion
Signal gating
Signal level control
Step size
Accuracy
Dynamic range
Means and scales for calibration
Sound field characteristics
General
Free sound field
Diffuse sound field
Quasi-free sound field
Ambient noise levels in the test room
Preparation and instruction of test subject
Determination of hearing threshold level
General
Monaural testing
Binaural testing
Testing with a hearing aid
Screening audiometry
Reporting of data
General
Equipment calibrated by hearing level
Equipment calibrated by sound pressure level
Maintenance and calibration of equipment
General
Intervals between tests
Stage A: routine examination and listening tests
Stage B: periodic electroacoustic tests
Stage C: basic calibration tests
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Scope
Normative references
Terms and definitions
Test signal characteristics
General
Pure tones
FM tones
Narrow bands of noise
Harmonic distortion
Signal gating
Signal level control
Step size
Accuracy
Dynamic range
Means and scales for calibration
Sound field characteristics
General
Free sound field
Diffuse sound field
Quasi-free sound field
Ambient noise levels in the test room
Preparation and instruction of test subject
Determination of hearing threshold level
General
Monaural testing
Binaural testing
Testing with a hearing aid
Screening audiometry
Reporting of data
General
Equipment calibrated by hearing level
Equipment calibrated by sound pressure level
Maintenance and calibration of equipment
General
Intervals between tests
Stage A: routine examination and listening tests
Stage B: periodic electroacoustic tests
Stage C: basic calibration tests