EN ISO 8253-1:1998
(Main)Acoustics - Audiometric test methods - Part 1: Basic pure tone air and bone conduction threshold audiometry (ISO 8253-1:1989)
Acoustics - Audiometric test methods - Part 1: Basic pure tone air and bone conduction threshold audiometry (ISO 8253-1:1989)
Specifies procedures and requirements. For screening purposes only air conduction pure tone audiometric test procedures are described. 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 8253-1:1989)
Dieser Teil von ISO 8253 legt Verfahren und Anforderungen für Luft- und Knochenleitungs-Schwellenaudiometrie fest. Für Screening-Untersuchungen werden nur Reinton-Luftleitungs-Verfahren beschrieben. Die Verfahren sind möglicherweise für besondere Gruppen, z.B. sehr junge Kinder, nicht geeignet.
Acoustique - Méthodes d'essais audiométriques - Partie 1: Audiométrie liminaire fondamentale à sons purs en conduction aérienne et en conduction osseuse (ISO 8253-1:1989)
Akustika - Avdiometrijske preskusne metode - 1. del: Pražna avdiometrija s čistimi toni za zračno in kostno prevodnost (ISO 8253-1:1989)
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Akustik - Audiometrische Prüfverfahren - Teil 1: Grundlegende Verfahren der Luft- und Knochenleitungs-Schwellenaudiometrie mit reinen Tönen (ISO 8253-1:1989)Acoustique - Méthodes d'essais audiométriques - Partie 1: Audiométrie liminaire fondamentale a sons purs en conduction aérienne et en conduction osseuse (ISO 8253-1:1989)Acoustics - Audiometric test methods - Part 1: Basic pure tone air and bone conduction threshold audiometry (ISO 8253-1:1989)17.140.01Acoustic measurements and noise abatement in general13.140Vpliv hrupa na ljudiNoise with respect to human beingsICS:Ta slovenski standard je istoveten z:EN ISO 8253-1:1998SIST EN ISO 8253-1:1999en01-november-1999SIST EN ISO 8253-1:1999SLOVENSKI
STANDARD
INTERNATIONAL STANDARD IS0 8253-l First edition 1989-11-15 Acoustics - Audiometric test methods - Part I: Basic pure tone air and bone conduction threshold audiometry Acoustique - Mkhodes d’essais audiome’triques - Partie 7 : Audiomhtrie liminaire fondamen tale ;5 sons purs en conduction akienne et en conduction osseuse Reference number IS0 8253-l : 1989 (E) SIST EN ISO 8253-1:1999
1s0 8253-l : 1989 (El Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 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, govern- mental and non-governmental, in liaison with ISO, also take part in the work. IS0 collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the IS0 Council. They are approved in accordance with IS0 procedures requiring at least 75 % approval by the member bodies voting. International Standard IS0 8253-l was prepared by Technical Committee ISO/TC 43, Acoustics. IS0 8253 will consist of the following parts, under the general title Acoustics - Audio- metric test methods: - - Part I: Basic pure tone air and bone conduction threshold audiometry Part 2: Sound field audiometry with pure tone and narrow-band signals Annex A of this part of IS0 8253 is for information only. 0 IS0 1989 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Organization for Standardization . Case postale 56 l CH-1211 Geneve 20 l Switzerland Printed in Switzerland ii SIST EN ISO 8253-1:1999
ISO8253-1 :1989 E) Introduction This International Standard lays down 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. Pro- cedures for air conduction threshold audiometry for hearing conservation purposes are given in IS0 6189. Where appropriate, both International Standards have been brought into line with one another. In order to obtain a reliable measure of hearing ability, many factors are involved. IEC 645 specifies requirements for audiometers. It is essential that audiometric equip- ment, when in service, be checked and the calibration maintained. This part of IS0 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 cer- tain values, depending upon the method of signal presentation to the test subject, i.e. by earphone or by bone vibrator. This part of IS0 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 have to be measured. 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 presenta- tion. 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 IS0 8253. For very young, aged or sick people, some modification of the recom- mended procedures is likely to be required. This may result in a less accurate measure- ment of hearing. SIST EN ISO 8253-1:1999
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INTERNATIONAL STANDARD IS0 8253-l : 1989 (E) Acoustics - Audiometric test methods - Part 1: Basic pure tone air and bone conduction threshold audiometry 1 Scope This part of IS0 8253 specifies procedures and requirements for air conduction and bone conduction threshold audiometry. For screening purposes, only air conduction pure tone audiometric test methods are described. The procedures may not be ap- propriate for special populations, for example very young children. Some audiometric procedures need to be carried out at levels above the hearing threshold levels of the subjects. These and other tests are not described in this part of IS0 8253. Procedures and requirements for speech audiometry, elec- trophysiological audiometry, and where loudspeakers are used as a sound source are not specified. Air conduction threshold audiometry for hearing conservation purposes is described in IS0 6189. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this part of IS0 8253. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this part of IS0 8253 are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. IS0 389 : 1985, Acoustics - Standard reference zero for the calibration of pure tone air conduction audiometers. IS0 7566 : 1987, Acoustics - Standard reference zero for the calibration of pure- tone bone conduction audiometers. IEC 225 : 1966, Octave, half-octave and third-octave band filters intended for the analysis of sounds and vibrations. IEC 303 : 1970, IEC provisional reference coupler for the calibra- tion of earphones used in audiometry. IEC 318 : 1970, An IEC artificial ear, of the wideband type, for the calibration of earphones used in audiometry. I EC 373 : I971, An IEC mechanical coupler for the calibration of bone vibrators having a specified contact area and being applied with a specified static force. I EC 645 : 1979, Audiometers. IEC 651 : 1979, Sound level meters. I EC 804 : I985, Integrating-averaging sound level meters. 3 Definitions For the purposes of this part of IS0 8253, the following defini- tions apply. 3.1 air conduction: The transmission of sound through the outer and middle ear to the inner ear. 3.2 acoustic coupler: A cavity of specified shape and volume which is used for the calibration of an earphone in con- junction with a calibrated microphone to measure the sound pressure developed within the cavity. NOTE - An acoustic coupler is specified in IEC 303. 3.3 artificial ear: A device for the calibration of an earphone which presents to the earphone an acoustic impedance equivalent to the impedance presented by the average human ear. It is equipped with a calibrated microphone for the measurement of the sound pressure developed by the ear- phone. NOTE - An artificial ear is specified in IEC 318. 3.4 bone conduction: The transmission of sound to the inner ear primarily by means of mechanical vibration of the cranial bones. 3.5 bone vibrator: An electromechanical transducer in- tended to produce the sensation of hearing by vibrating the cranial bones. 1 SIST EN ISO 8253-1:1999
IS0 8253-l : 1989 (EI 36 mechanical coupler: A device designed to present a sbecified 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. NOTE - A mechanical coupler is specified in IEC 373. 3.7 otologically normal person: A person in a normal state of health who is free from all signs or symptoms of ear disease and from obstructing wax in the ear canal, and who has no history of undue exposure to noise. 3.8 hearing threshold: The lowest sound pressure level or vibratory force level at which, under specified conditions, a per- son gives a predetermined percentage of correct detection responses on repeated trials. 3.9 equivalent threshold sound pressure level (monaural earphone listening): 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 artificial ear when the earphone is actuated by that voltage which, with the earphone applied to the ear concerned, would correspond to the hearing threshold. 3.10 reference equivalent threshold sound pressure level (RETSPL): At a specified frequency, the modal value of the equivalent threshold sound pressure levels of a sufficiently large number of ears of otologically normal persons of both sexes aged between I8 years and 30 years inclusive, expressing the hearing threshold in a specified acoustic coupler or artificial ear for a specified type of earphone. 3.11 equivalent threshold force level (monaural listening): 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 bone, the vibratory force level set up by the bone vibrator on a specified mechanical coupler when the bone vibrator is ac- tuated by that voltage which, with the bone vibrator applied to the mastoid bone concerned, would correspond to the hearing threshold. 3.12 reference equivalent threshold force level (RETFL) : At a specified frequency, the mean value of the equivalent threshold force levels of a sufficiently large number of ears of otologically normal persons of both sexes aged between I8 years and 30 years inclusive, expressing the hearing threshold in a specified mechanical coupler for a specified type of bone vibrator. 3.13 hearing level of a pure tone (at a specified frequency, for a specific type of transducer and for a specified manner of application): The sound pressure level (or the vibratory force level) of a pure tone, produced by the transducer in a specified artificial ear or acoustic coupler (or mechanical coupler) minus the appropriate reference equivalent threshold sound pressure level (or reference equivalent threshold force level). 3.14 hearing threshold level of a given ear (at a specified frequency and for a specified type of transducer): The hearing threshold at that frequency, expressed as hearing level. 3.15 occlusion effect: The 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. The effect is greatest at low frequencies. 3.16 masking : (I) The process by which the hearing threshold of a given ear to a particular sound is raised by the presence of another (masking) sound. (2) The amount by which the hearing threshold level of a given ear is so raised, expressed in decibels. 3.17 effective masking level of a noise band: A 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 645 specifies that masking levels for be calibrated in terms of effective masking level. narrow band noise 3.18 vibrotactile threshold level: The level of the vibratory force or sound pressure at which a person gives a predeter- mined percentage of correct detection responses on repeated trials due to the sensation of vibration on the skin. 3.19 pure-tone audiometer: An electroacoustic instru- ment, equipped with earphones, that provides pure tones of specified frequencies at known sound pressure levels. In addi- tion, it may be equipped with bone vibrator(s) and/or masking facilities. 3.20 manual audiometer: An audiometer in which the signal presentations, frequency and hearing level selection and recording of the results are performed manually. 3.21 computer-controlled audiometer: An audiometer in which the test procedure is controlled by computer. For the purposes of this part of IS0 8253, a computer is considered as any electronic device that has a program controlling the test procedure. 3.22 automatic recording audiometer: An audiometer in which hearing level variations are under the subject’s control and are recorded automatically. 3.23 sweep-frequency audiometer: An automatic re- cording audiometer where the frequency is varied continuously or in steps much smaller than one-third octave. 3.24 screening audiometry: Screening audiometry is a pass-fail procedure where pure tones of a fixed level, the screening level, are presented. SIST EN ISO 8253-1:1999
IS0 8253-1 : 1989 (E) 3.25 pure-tone audiogram of a subject: Presentation, in graphical or tabular form, of the hearing threshold levels of the subject’s ears, determined under specified conditions and by a specified method, as a function of frequency. 4 m General aspects of audio metric easurements 4.1 General Hearing threshold levels can be determined by air conduction and bone conduction audiometry. In air conduction audio- metry, the test signal is presented to the test subject by ear- phones. 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 wit
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