EN 27029:1991
(Main)Acoustics - Threshold of hearing by air conduction as a function of age and sex for otologically normal persons (ISO 7029:1984)
Acoustics - Threshold of hearing by air conduction as a function of age and sex for otologically normal persons (ISO 7029:1984)
Specification for the range of audiometric frequencies from 125 to 8000 Hz and for groups of otologically normal persons of a given age within the age limits of 18 to 70 years inclusive : a) the expected value of the median hearing threshold shift relative to a group of persons 18 years of age; b) the expected statistical distribution above and below the median value.
Akustik - Luftleitungshörschwelle in Abhängigkeit von Alter und Geschlecht otologisch normaler Personen (ISO 7029:1984)
Acoustique - Seuil normal d'audition par conduction aérienne en fonction de l'âge et du sexe pour les personnes otologiquement normales (ISO 7029:1984)
Akustika - Slušni prag v odvisnosti od starosti in spola otološke normalne osebe (ISO 7029:1984)
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Akustika - Slušni prag v odvisnosti od starosti in spola otološke normalne osebe (ISO 7029:1984)Akustik - Luftleitungshörschwelle in Abhängigkeit von Alter und Geschlecht otologisch normaler Personen (ISO 7029:1984)Acoustique - Seuil normal d'audition par conduction aérienne en fonction de l'âge et du sexe pour les personnes otologiquement normales (ISO 7029:1984)Acoustics - Threshold of hearing by air conduction as a function of age and sex for otologically normal persons (ISO 7029:1984)17.140.99Drugi standardi v zvezi z akustikoOther standards related to acoustics13.140Vpliv hrupa na ljudiNoise with respect to human beingsICS:Ta slovenski standard je istoveten z:EN 27029:1991SIST EN 27029:1999en01-november-1999SIST EN 27029:1999SLOVENSKI
STANDARD
SIST EN 27029:1999
SIST EN 27029:1999
SIST EN 27029:1999
International tandard INTERNATIONAL ORGANIZATION FOR STANDARDIZATlON.ME~YHAPO~HAfl OPTAHM3AUMR IlO CTAH~APTM3A~MlWORGANlSATlON INTERNATIONALE DE NORMALISATION Acoustics - Threshold of hearing by air conduction as a function of age and sex for otologically normal persons Acoustigue - Seuil normal d’audition par conduction ahienne en fonction de Ege et du sexe pour les personnes 0 tologiguemen t normales First edition - 1984-12-15 UDC 534.75: 612.85 Ref. No. IS0 7029-1984 (E) Descriptors : acoustics, audiometry, humans, audibility, auditory threshold. Price based on 8 pages SIST EN 27029:1999
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. 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. Internation Acoustics. al Standard IS0 7029 was prepared by Technical Committee lSO/TC 43, 0 International Organization for Standardization, 1984 Printed in Switzerland SIST EN 27029:1999
INTERNATIONAL STANDARD IS0 7029-1984 (E) Acoustics - Threshold of hearing by air conduction as a function of age and sex for otologically normal persons 0 Introduction It is well known that the sensitivity of human hearing to pure tones falls progressively with age and that the loss of hearing is more rapid for high-frequency tones than for low-frequency tones. Moreover, the magnitude of this effect varies con- siderably between individuals. In the case of young persons, data have been standardized (see IS0 389) specifying the modal values of the threshold of hea- ring for the otologically normal (as defined in IS0 389); these data form the basis for calibrating pure tone audiometers. These data do not discriminate between male and female per- sons and they do not specify the technique of audiometry to which they apply. It is known that these distinctions should, in principle, be made in order to obtain the most accurate value for audiometric zero. In this International Standard the distinc- tion between males and females has been made since the diffe- rence is found to be significantly large in the case of older age groups. When an individual, who is more than 18 years old, is being tested with an audiometer, part of any observed hearing loss will most probably be associated with the person’s age, and it is, therefore, important to be aware of this when estima- ting the amount of hearing loss attributable to other causes under investigation. Furthermore, there is a need for generally acceptable data to be standardized for this purpose. Numerous data on the elevation of hearing threshold levels in- creasing with age exist in various publications, but there are certain numerical differences between them which may be at- tributed to the use of different criteria of selection for test populations, different audiometric techniques, etc. However, a thorough examination of the data has enabled a representative set of values to be established. This International Standard is based on these values which refer to screened populations of otologically normal persons as defined herein. 1 Scope and field of application This International Standard specifies, for the range of audiometric frequencies from 125 to 8 000 Hz and for groups of otologically normal persons of a given age within the age limits of 18 to 70 years inclusive : a) the expected value of the median hearing threshold shift relative to a group of persons 18 years of age; b) the expected statistical distribution above and below the median value (see note 2 to 4.1). The data in this International Standard are applicable as des- criptive statistics of the hearing levels of populations of various ages. An example of this application is as a baseline of compari- son for estimating the amount of hearing loss caused in a popu- lation due to a specific agent, for example, noise, and in this application the data of this International Standard are included as “Data Base A” in IS0 1999. The data may also be used to compare an individual’s hearing with the normal distribution of the hearing threshold levels for the person’s age group. In the audiological diagnosis of an individual person, it is, however, not possible to determine precisely which changes of the hea- ring threshold level are attributable to an accumulation of detri- mental effects upon the hearing increasing with age and which changes have been caused by other factors such as, for exam- ple, noise. 2 References IS0 389, Acoustics - Standard reference zero for the calibra- tion of pure tone audiometers. IS0 1999, Acoustics - Determination of occupational noise exposure and es tima tion of noise-induced hearing impairment. 1, IS0 6189, Acoustics - Pure tone air conduction threshold audiometry for hearing conservation purposes. IS0 8253, Acoustics - Pure tone audiometric test methods.2) IEC Publication 645, Audiometers. 1) At present at the stage of draft. (Revision of IS0 1999-1975.) 2) At present at the stage of draft. SIST EN 27029:1999
IS0 7029-1984 (E) 3 Definitions Table 1 - Values of the coefficient a used to determine the median value of hearing threshold deviation for an otologically normal population of given age For the purpose of this International Standard, the following definitions apply. 3.1 otologically normal person : A person in a normal state of health who at the time of testing is free from excess wax in the ear canals, is without known ear pathology and who has no history of undue exposure to noise. 3.2 hearing threshold level (of a given ear of a person at a given frequency) : The threshold of hearing as determined in a stated manner by means of a pure tone air conduction audio- meter, expressed as the hearing level in decibels. NOTES 1 Specifications for audiometers are given in IEC Publication 645. 2 For the calibration of audiometers, see IS0 389. 3 For appropriate test conditions see, for example, IS0 6189 and IS0 8253. 3.3 hearing level : The sound pressure level of a tone of given frequency which is generated by the earphone of a pure tone audiometer in an acoustic coupler of specified type, when expressed in decibels relative to the reference equivalent threshold sound pressure level (audiometric zero) for that fre- quency and for the pattern of earphone and acoustic coupler in question. NOTE - Values of reference equivalent threshold sound pressure level for various patterns of earphone are specified in IS0 389. 4 Specification 4.1 Median values The median value of hearing threshold deviation of otologically normal persons aged Y years shall be given by the following equation : H md, Y = dY - 18 yearsI + Hmd,,* . . . (1) where Hmd 18 is the median value of hearing threshold level of otologically’ normal persons of the same sex aged 18 years. NOTES 1 For practical purposes, Hmd ,s may be taken as zero, corresponding to the hearing threshold for young persons, as specified in IS0 389. 2 The median values specified in this International Standard are not the modal values used in IS0 389. Values of the coefficient a for males and females shall be those given in table 1. The range of Y for which formula 70 years inclusive. ( 1) is valid is from 18 to Frequency in Hz Value of a, in dB/yeaG Males Females 125 0,003 0 0,003 0 250 0,003 0 0,003 0 500 0,003 5 0,003 5 1 000 0,004 0 0,004 0 1 500 0,005 5 0,005 0 2000 0,007 0 0,006 0 3 000 0,011 5 0,007 5 4 000 0,016 0 0,009 0 6 000 0,018 0 0,012 0 8000 0,022 0 0,015 0 4.2 Statistical distribution 4.2.1 The statistical distribution of hearing threshold levels of otologically normal persons of a given age shall be approx- imated, for the purpose of this International Standard, by the halves of two normal (Gaussian) distributions. One half lies above the median value, Hmd y, and has the larger dispersion characterized by the parameter sU; the other half lies below the median and has the smaller dispersion characterized by the parameter sI. Values of the parameters s, and sI, in decibels, are given by the following equations : %I = bu + 0,445 Hmd y . . . I (2) SI = 61 + 0,356 Hmd y . . . I (3) where b, and b, have the values given in table 2. NOTE - The parameters sU and sl are defined so that they correspond to the standard deviation of the full normal distributions of which the upper and lower halves respectively comprise the actual distribution of hearing threshold levels. Table 2 - Values of the parameters b, and b, used to determine respectively the upper and lower parts of the statistical distribution of hearing threshold levels, centred on the median value, for an otologically normal population of given age Frequency in Hz 125 250 500 1000 1500 2000 3000 4000 6000 8000 Value of b,, in dB Value of b,, in dB Males Females Males Females 7,23 6,67 5,78 534 6,67 6,12 534 4,89 6,12 6,12 4,89 4,89 6,12 6,12 4,89 4,89 6,67 6,67 5,34 5’3 7,23 6,67 5,78 5,34 7,78 7,23 6,23 578 83 7,78 6,
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