Acoustics - Audiometric test methods - Part 1: Pure-tone air and bone conduction audiometry (ISO 8253-1:2010)

ISO 8253-1:2010 specifies procedures and requirements for pure-tone air conduction and bone conduction threshold audiometry. For screening purposes, only pure-tone air conduction audiometric test methods are specified. It is possible that the procedures are not appropriate for special populations, e.g. very young children.
ISO 8253-1:2010 does not cover audiometric procedures to be carried out at levels above the hearing threshold levels of the subjects.
Procedures and requirements for speech audiometry, electrophysiological audiometry, and where loudspeakers are used as a sound source are not specified.

Akustik - Audiometrische Prüfverfahren - Teil 1: Grundlegende Verfahren der Luft- und Knochenleitungs-Schwellenaudiometrie mit reinen Tönen (ISO 8253-1:2010)

Dieser Teil von ISO 8253 legt Verfahren und Anforderungen für Luft- und Knochenleitungs-Reinton-
Schwellenaudiometrie fest. Für audiometrische Screening-Tests werden nur Reinton-Luftleitungs-Verfahren
beschrieben. Die Verfahren sind möglicherweise für besondere Gruppen, z. B. sehr junge Kinder, nicht
geeignet.
Audiometrische Verfahren, die bei Pegeln über der Hörschwelle der Probanden durchgeführt werden, sind
nicht Gegenstand dieses Teils von ISO 8253.
Verfahren und Anforderungen für die Sprachaudiometrie, elektrophysiologische Audiometrie und Verfahren,
bei denen Lautsprecher als Schallquellen eingesetzt werden, werden nicht festgelegt.

Acoustique - Méthodes d'essais audiométriques - Partie 1: Audiométrie à sons purs en conduction aérienne et en conduction osseuse (ISO 8253-1:2010)

L'ISO 8253-1:2010 spécifie des modes opératoires et des exigences relatives à l'audiométrie liminaire à sons purs en conduction aérienne et en conduction osseuse. En ce qui concerne l'audiométrie de dépistage, seules sont décrites des méthodes audiométriques liminaires tonales en conduction aérienne. Il est possible que les modes opératoires ne conviennent pas à certaines populations, par exemple aux très jeunes enfants.
L'ISO 8253-1:2010 ne traite pas des méthodes audiométriques devant être exécutées à des niveaux dépassant les niveaux liminaires d'audition des sujets testés.
Les modes opératoires et les exigences relatifs à l'audiométrie vocale, à l'audiométrie électrophysiologique et à l'usage de haut-parleurs pour délivrer les sons ne sont pas spécifiés.

Akustika - Avdiometrijske preskusne metode - 1. del: Avdiometrija s čistimi toni za zračno in kostno prevodnost (ISO 8253-1:2010)

Ta del ISO 8253 opredeljuje postopke in zahteve za avdiometrijo s čistimi toni za zračno prevodnost in avdiometrijo pragovnih vrednosti za kostno prevodnost. Za presajanje so opredeljene le metode avdiometrije s čistimi zvoki za zračno prevodnost. Mogoče je, da ti postopki niso primerni za vse prebivalce, npr. zelo majhne otroke. Ta del ISO 8253 ne zajema postopkov avdiometrije, ki se izvajajo na ravneh nad slišnim pragom oseb. Postopki in zahteve za avdiometrijo govora, elektrofiziološko avdiometrijo in pri uporabi zvočnika kot vira hrupa niso opredeljeni.

General Information

Status
Published
Publication Date
31-Oct-2010
Technical Committee
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
01-Nov-2010
Completion Date
01-Nov-2010

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SLOVENSKI STANDARD
SIST EN ISO 8253-1:2011
01-marec-2011
1DGRPHãþD
SIST EN 26189:1999
SIST EN ISO 8253-1:1999

$NXVWLND$YGLRPHWULMVNHSUHVNXVQHPHWRGHGHO$YGLRPHWULMDVþLVWLPLWRQL]D

]UDþQRLQNRVWQRSUHYRGQRVW ,62
Acoustics - Audiometric test methods - Part 1: Pure-tone air and bone conduction
audiometry (ISO 8253-1:2010)

Akustik - Audiometrische Prüfverfahren - Teil 1: Grundlegende Verfahren der Luft- und

Knochenleitungs-Schwellenaudiometrie mit reinen Tönen (ISO 8253-1:2010)

Acoustique - Méthodes d'essais audiométriques - Partie 1: Audiométrie à sons purs en

conduction aérienne et en conduction osseuse (ISO 8253-1:2010)
Ta slovenski standard je istoveten z: EN ISO 8253-1:2010
ICS:
13.140 Vpliv hrupa na ljudi Noise with respect to human
beings
17.140.01 $NXVWLþQDPHUMHQMDLQ Acoustic measurements and
EODåHQMHKUXSDQDVSORãQR noise abatement in general
SIST EN ISO 8253-1:2011 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN ISO 8253-1:2011
---------------------- Page: 2 ----------------------
SIST EN ISO 8253-1:2011
EUROPEAN STANDARD
EN ISO 8253-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2010
ICS 13.140 Supersedes EN 26189:1991, EN ISO 8253-1:1998
English Version
Acoustics - Audiometric test methods - Part 1: Pure-tone air and
bone conduction audiometry (ISO 8253-1:2010)

Acoustique - Méthodes d'essais audiométriques - Partie 1: Akustik - Audiometrische Prüfverfahren - Teil 1:

Audiométrie à sons purs en conduction aérienne et en Grundlegende Verfahren der Luft- und Knochenleitungs-

conduction osseuse (ISO 8253-1:2010) Schwellenaudiometrie mit reinen Tönen (ISO 8253-1:2010)

This European Standard was approved by CEN on 25 September 2010.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European

Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national

standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation

under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same

status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,

Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2010 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 8253-1:2010: E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN ISO 8253-1:2011
EN ISO 8253-1:2010 (E)
Contents Page

Foreword ..............................................................................................................................................................3

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SIST EN ISO 8253-1:2011
EN ISO 8253-1:2010 (E)
Foreword

This document (EN ISO 8253-1:2010) has been prepared by Technical Committee ISO/TC 43 “Acoustics” in

collaboration with Technical Committee CEN/TC 211 “Acoustics” the secretariat of which is held by DS.

This European Standard shall be given the status of a national standard, either by publication of an identical

text or by endorsement, at the latest by May 2011, and conflicting national standards shall be withdrawn at the

latest by May 2011.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent

rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN 26189:1991 and EN ISO 8253-1:1998.

According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following

countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech

Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,

Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,

Sweden, Switzerland and the United Kingdom.
Endorsement notice

The text of ISO 8253-1:2010 has been approved by CEN as a EN ISO 8253-1:2010 without any modification.

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SIST EN ISO 8253-1:2011
---------------------- Page: 6 ----------------------
SIST EN ISO 8253-1:2011
INTERNATIONAL ISO
STANDARD 8253-1
Second edition
2010-11-01
Acoustics — Audiometric test methods —
Part 1:
Pure-tone air and bone conduction
audiometry
Acoustique — Méthodes d'essais audiométriques —
Partie 1: Audiométrie à sons purs en conduction aérienne et en
conduction osseuse
Reference number
ISO 8253-1:2010(E)
ISO 2010
---------------------- Page: 7 ----------------------
SIST EN ISO 8253-1:2011
ISO 8253-1:2010(E)
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Published in Switzerland
ii © ISO 2010 – All rights reserved
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SIST EN ISO 8253-1:2011
ISO 8253-1:2010(E)
Contents Page

Foreword .............................................................................................................................................................v

Introduction........................................................................................................................................................vi

1 Scope......................................................................................................................................................1

2 Normative references............................................................................................................................1

3 Terms and definitions ...........................................................................................................................2

4 General aspects of audiometric measurements ................................................................................4

4.1 General ...................................................................................................................................................4

4.2 Standard reference zero for the calibration of audiometric equipment ..........................................5

4.3 Requirements on audiometric equipment ..........................................................................................5

4.4 Qualified tester ......................................................................................................................................5

4.5 Test time.................................................................................................................................................5

4.6 Conditions for audiometric test environments ..................................................................................5

4.7 Measurement uncertainty.....................................................................................................................6

5 Preparation and instruction of test subjects before audiometric testing and positioning of

transducers ............................................................................................................................................6

5.1 Preparation of test subjects .................................................................................................................6

5.2 Instruction of test subjects...................................................................................................................7

5.3 Placement of transducers ....................................................................................................................7

6 Air conduction hearing threshold level determinations using fixed-frequency audiometry ........7

6.1 General ...................................................................................................................................................7

6.2 Manually controlled threshold determination ....................................................................................8

6.3 Hearing threshold determination with an automatic recording audiometer.................................10

6.4 Computer-controlled threshold determination.................................................................................12

7 Air conduction hearing threshold level determinations using sweep-frequency

audiometry ...........................................................................................................................................12

7.1 General .................................................................................................................................................12

7.2 Presentation of test tone ....................................................................................................................12

7.3 Familiarization .....................................................................................................................................12

7.4 Hearing threshold level measurement ..............................................................................................12

7.5 Calculation of hearing threshold level at a specified frequency....................................................12

8 Bone conduction hearing threshold audiometry .............................................................................13

8.1 Method of audiometry.........................................................................................................................13

8.2 Occlusion .............................................................................................................................................13

8.3 Airborne sound radiation from the bone vibrator............................................................................13

8.4 Vibrotactile sensation .........................................................................................................................13

8.5 Procedures for testing with masking in bone conduction audiometry .........................................13

9 Screening audiometry.........................................................................................................................14

9.1 General .................................................................................................................................................14

9.2 Procedure for the screening test .......................................................................................................14

10 Audiograms..........................................................................................................................................15

11 Permissible ambient noise .................................................................................................................16

11.1 Permissible ambient noise for threshold determinations...............................................................16

11.2 Psycho-acoustic check on ambient noise........................................................................................16

12 Maintenance and calibration of audiometric equipment.................................................................20

12.1 General .................................................................................................................................................20

12.2 Intervals between checks ...................................................................................................................20

© ISO 2010 – All rights reserved iii
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SIST EN ISO 8253-1:2011
ISO 8253-1:2010(E)

12.3 Stage A — Routine checking and subjective tests ......................................................................... 20

12.4 Stage B — Periodic objective checks............................................................................................... 21

12.5 Stage C — Basic calibration tests..................................................................................................... 22

Annex A (informative) Measurement uncertainty ......................................................................................... 23

Bibliography..................................................................................................................................................... 28

iv © ISO 2010 – All rights reserved
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SIST EN ISO 8253-1:2011
ISO 8253-1:2010(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies

(ISO member bodies). The work of preparing International Standards is normally carried out through ISO

technical committees. Each member body interested in a subject for which a technical committee has been

established has the right to be represented on that committee. International organizations, governmental and

non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the

International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.

The main task of technical committees is to prepare International Standards. Draft International Standards

adopted by the technical committees are circulated to the member bodies for voting. Publication as an

International Standard requires approval by at least 75 % of the member bodies casting a vote.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent

rights. ISO shall not be held responsible for identifying any or all such patent rights.

ISO 8253-1 was prepared by Technical Committee ISO/TC 43, Acoustics.

This second edition cancels and replaces the first edition (ISO 8253-1:1989) and ISO 6189:1983, which have

been technically revised.

ISO 8253 consists of the following parts, under the general title Acoustics — Audiometric test methods:

⎯ Part 1: Pure-tone air and bone conduction audiometry
⎯ Part 2: Sound field audiometry with pure-tone and narrow-band test signals
⎯ Part 3: Speech audiometry
© ISO 2010 – All rights reserved v
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SIST EN ISO 8253-1:2011
ISO 8253-1:2010(E)
Introduction

This International Standard specifies requirements and procedures for carrying out basic audiometric tests in

which pure tones are presented to the test subject using earphones or bone vibrators. Electrophysiological

test methods are not included.

In order to obtain a reliable measure of hearing ability, many factors are involved. IEC 60645-1 specifies

requirements for audiometers. It is essential that audiometric equipment, when in service, be checked and the

calibration maintained. This part of ISO 8253 outlines a calibration scheme. To avoid masking of the test

signal by ambient noise in the audiometric test room, the levels of the ambient noise shall not exceed certain

values, depending upon the method of signal presentation to the test subject, i.e. by different earphones or by

bone vibrator. This part of ISO 8253 gives maximum permissible ambient sound pressure levels which shall

not be exceeded when hearing threshold levels down to 0 dB have to be measured. It indicates the maximum

ambient sound pressure levels which are permissible when other minimum hearing threshold levels require

measurement. It sets out procedures for determining hearing threshold levels by pure-tone air conduction and

bone conduction audiometry. For screening purposes, only methods for air conduction audiometry are

outlined.
Audiometry can be performed by using:
a) a manual audiometer;
b) an automatic recording audiometer;
c) computer-controlled audiometric equipment.

Methods for threshold audiometry are given for these three types of signal presentation. For screening

purposes, only methods using a manual or a computer-controlled audiometer are set out. The procedures are

applicable to the majority of adults and children. Other procedures may yield results equivalent to those

derived by the procedures specified in this part of ISO 8253. For very young, aged or sick people, some

modification of the recommended procedures is likely to be required. This may result in a less accurate

measurement of hearing.
vi © ISO 2010 – All rights reserved
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SIST EN ISO 8253-1:2011
INTERNATIONAL STANDARD ISO 8253-1:2010(E)
Acoustics — Audiometric test methods —
Part 1:
Pure-tone air and bone conduction audiometry
1 Scope

This part of ISO 8253 specifies procedures and requirements for pure-tone air conduction and bone

conduction threshold audiometry. For screening purposes, only pure-tone air conduction audiometric test

methods are specified. It is possible that the procedures are not appropriate for special populations, e.g. very

young children.

This part of ISO 8253 does not cover audiometric procedures to be carried out at levels above the hearing

threshold levels of the subjects.

Procedures and requirements for speech audiometry, electrophysiological audiometry, and where

loudspeakers are used as a sound source are not specified.
2 Normative references

The following referenced documents are indispensable for the application of this document. For dated

references, only the edition cited applies. For undated references, the latest edition of the referenced

document (including any amendments) applies.

ISO 389-1, Acoustics — Reference zero for the calibration of audiometric equipment — Part 1: Reference

equivalent threshold sound pressure levels for pure tones and supra-aural earphones

ISO 389-2, Acoustics — Reference zero for the calibration of audiometric equipment — Part 2: Reference

equivalent threshold sound pressure levels for pure tones and insert earphones

ISO 389-3:1994, Acoustics — Reference zero for the calibration of audiometric equipment — Part 3:

Reference equivalent threshold force levels for pure tones and bone vibrators

ISO 389-5, Acoustics — Reference zero for the calibration of audiometric equipment — Part 5: Reference

equivalent threshold sound pressure levels for pure tones in the frequency range 8 kHz to 16 kHz

ISO 389-8, Acoustics — Reference zero for the calibration of audiometric equipment — Part 8: Reference

equivalent threshold sound pressure levels for pure tones and circumaural earphones

IEC 60645-1:2001, Electroacoustics — Audiological equipment — Part 1: Pure-tone audiometers

IEC 61260, Electroacoustics — Octave-band and fractional-octave-band filters
IEC 61672-1, Electroacoustics — Sound level meters — Part 1: Specifications

ISO/IEC Guide 98-3, Uncertainty of measurement — Part 3: Guide to the expression of uncertainty in

measurement (GUM:1995)
© ISO 2010 – All rights reserved 1
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SIST EN ISO 8253-1:2011
ISO 8253-1:2010(E)
3 Terms and definitions
For the purposes of this part of ISO 8253, the following definitions apply.
3.1
air conduction
transmission of sound through the external and middle ear to the inner ear
3.2
ear simulator

device for measuring the acoustic output of sound sources where the sound pressure is measured by a

calibrated microphone coupled to the source so that the overall acoustic impedance of the device

approximates that of the normal human ear at a given location and in a given frequency band

[4] [6]
NOTE An ear simulator is specified in IEC 60318-1 and IEC 60318-4 .
3.3
acoustic coupler

device for measuring the acoustic output of sound sources where the sound pressure is measured by a

calibrated microphone coupled to the source by a cavity of predetermined shape and volume which does not

necessarily approximate the acoustic impedance of the normal human ear
[5] [7]
NOTE An acoustic coupler is specified in IEC 60318-3 and IEC 60318-5 .
3.4
bone conduction

transmission of sound to the inner ear primarily by means of mechanical vibration of the cranial bones

3.5
bone vibrator

electromechanical transducer intended to produce the sensation of hearing by vibrating the cranial bones

3.6
mechanical coupler

device designed to present a specified mechanical impedance to a vibrator applied with a specified static

force and equipped with a mechano-electrical transducer to measure the vibratory force level at the surface of

contact between vibrator and mechanical coupler
[8]
NOTE A mechanical coupler is specified in IEC 60318-6 .
3.7
otologically normal person

person in a normal state of health who is free from all signs and symptoms of ear disease and from

obstructing wax in the ear canal and who has no history of undue exposure to noise, exposure to potentially

ototoxic drugs, or familial hearing loss
3.8
hearing threshold

lowest sound pressure level or vibratory force level at which, under specified conditions, a person gives a

predetermined percentage of correct detection responses on repeated trials
3.9
equivalent threshold sound pressure level

for a given ear, at a specified frequency, for a specified type of earphone and for a stated force of application

of the earphone to the human ear, the sound pressure level set up by the earphone in a specified acoustic

coupler or ear simulator when the earphone is actuated by that voltage which, with the earphone applied to

the ear concerned, would correspond to the hearing threshold
2 © ISO 2010 – All rights reserved
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SIST EN ISO 8253-1:2011
ISO 8253-1:2010(E)
3.10
reference equivalent threshold sound pressure level
RETSPL

at a specified frequency, the median value of the equivalent threshold sound pressure levels of a sufficiently

large number of ears of otologically normal persons of both sexes aged from 18 years to 25 years inclusive,

expressing the hearing threshold in a specified acoustic coupler or ear simulator for a specified type of

earphone

NOTE ISO 389-1 refers to an age range of 18 years to 30 years inclusive, and specifies modal values.

3.11
equivalent threshold vibratory force level

for a given ear, at a specified frequency, for a specified configuration of bone vibrator and for a stated force of

application of the bone vibrator to the human mastoid or forehead, the vibratory force level set up by the bone

vibrator on a specified mechanical coupler when the bone vibrator is actuated by that voltage which, with the

bone vibrator applied to the mastoid or forehead concerned, would correspond to the hearing threshold

3.12
reference equivalent threshold vibratory force level
RETVFL

at a specified frequency, the median value of the equivalent threshold vibratory force levels of a sufficiently

large number of ears of otologically normal persons of both sexes aged from 18 years to 25 years inclusive,

expressing the hearing threshold in a specified mechanical coupler for a specified type of bone vibrator

NOTE ISO 389-3 refers to an age range of 18 years to 30 years inclusive, and specifies an arithmetic mean.

3.13
hearing level of a pure tone
HL of a pure tone

at a specified frequency, for a specific type of transducer and for a specified manner of application, sound

pressure level or vibratory force level of a pure tone, produced by a transducer in a specific ear simulator or

mechanical coupler, minus the appropriate reference equivalent threshold sound pressure level or reference

equivalent threshold vibratory force level
3.14
hearing threshold level of a given ear

at a specified frequency and for a specific type of transducer, hearing threshold at that frequency, expressed

as hearing level
3.15
occlusion effect

change (usually an increase) in level of a bone-conducted signal reaching the inner ear when an earphone or

an earplug is placed over or at the entrance of the ear canal, thereby forming an enclosed air volume in the

external ear
NOTE The effect is greatest at low frequencies.
3.16
masking

process by which the hearing threshold of a given ear for a particular sound is raised by the presence of

another (masking) sound
3.17
effective masking level of a noise band

level equal to that hearing level of a pure tone, the frequency of which coincides with the geometric centre

frequency of the noise band, to which the threshold of hearing of the pure tone is raised by the presence of

the masking noise band

NOTE IEC 60645-1:2001, 8.5.2 a), specifies that masking levels for narrow-band noise be calibrated in terms of

effective masking level.
© ISO 2010 – All rights reserved 3
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SIST EN ISO 8253-1:2011
ISO 8253-1:2010(E)
3.18
vibrotactile threshold level

level of the vibratory force or sound pressure at which a person gives 50 % of correct detection responses on

repeated trials due to the sensation of vibration on the skin
3.19
pure-tone audiometer

electroacoustic instrument, equipped with earphone(s), that provides pure tones of specified frequencies at

known sound pressure levels

NOTE In addition, it may be equipped with bone vibrator(s) and/or masking facilities.

3.20
manual audiometer

audiometer in which the signal presentations, frequency and hearing level selection and recording of the

results are performed manually
3.21
automatic-recording audiometer

audiometer in which signal presentations, hearing level variation, frequency selection or frequency variation,

and recording of the responses of the test subject are implemented automatically

NOTE Hearing level change is under the control of the test subject and is recorded automatically.

3.22
automatic fixed-frequency audiometry

audiometry in which hearing level variations are under the control of the test subject and are recorded

automatically for specific frequencies
3.23
automatic sweep-frequency audiometry

audiometry in which hearing level variations are under the control of the test subject and where the frequency

is varied continuously or in steps much smaller than one-third octave
3.24
screening audiometry

pass-fail procedure where pure tones of a fixed level, the screening level, are presented

3.25
audiogram

presentation, in graphical or tabular form, of the hearing threshold levels of the ears of the test subject,

determined under specified conditions and by a specified method, as a function of frequency

4 General aspects of audiometric measurements
4.1 General

Hearing threshold levels can be determined by air conduction and bone conduction audiometry. In air

conduction audiometry, the test signal is presented to the test subject by earphones. In bone conduction

audiometry, the test signal is presented by a bone vibrator placed on the mastoid or forehead of the test

subject. It is recommended that threshold level determinations be started with air conduction measurements

followed by bone conduction measurements. Hearing threshold levels can be determined using test tones with

fixed frequencies (fixed-frequency audiometry) or a test signal with frequency varying with time according to a

predetermined rate of change (sweep-frequency audiometry). Methods for fixed-frequency audiometry are

given in Clause 6 and sweep-frequency audiometry is described in Clause 7. In air and bone conduction

measurements, the hearing threshold levels of both ears shall be determined separately. Under specified

conditions, masking noise shall be applied to the ear not under test (contralateral ear). The masking noise is

presented to that ear through a supra-aural, circumaural or insert-type earphone.

4 © ISO
...

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