EN 50332-3:2017

SLOVENSKI STANDARD
01-september-2017
2SUHPDVLVWHPDR]YRþHQMDQDJODYQHLQXãHVQHVOXãDONHVNXSDM]RVHEQLPL
JODVEHQLPLSUHGYDMDOQLNL0HWRGRORJLMD]DPHUMHQMHQLYRMDQDMYHþMHJD]YRþQHJD
WODNDGHO0HULOQDPHWRGD]DXSUDYOMDQMH]GR]R]YRND
Sound system equipment: headphones and earphones associated with personal music
players - maximum sound pressure level measurement methodology - Part 3:
measurement method for sound dose management
Elektroakustische Geräte: Kopfhörer und Ohrhörer in Verbindung mit tragbaren
Audiogeräten - Verfahren zur Messung des maximalen Schalldruckpegels - Teil 3:
Messmethode für Schalldosis Management
Équipements de diffusion sonore: casques et écouteurs associés avec un lecteur de
musique individuel - Méthode de mesure de niveau maximal de pression acoustique -
Partie 3: Méthode de mesure pour la gestion de la dose de bruit
Ta slovenski standard je istoveten z: EN 50332-3:2017
ICS:
17.140.50 Elektroakustika Electroacoustics
33.160.50 Pribor Accessories
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN 50332-3
NORME EUROPÉENNE
EUROPÄISCHE NORM
February 2017
ICS 17.140.50; 33.160.50
English Version
Sound system equipment: headphones and earphones
associated with personal music players - maximum sound
pressure level measurement methodology - Part 3:
measurement method for sound dose management
Équipements de diffusion sonore: casques et écouteurs Elektroakustische Geräte: Kopfhörer und Ohrhörer in
associés avec un lecteur de musique individuel - Méthode Verbindung mit tragbaren Audiogeräten - Verfahren zur
de mesure de niveau maximal de pression acoustique - Messung des maximalen Schalldruckpegels - Teil 3:
Partie 3: Méthode de mesure pour la gestion de la dose de Messmethode für Schalldosis Management
bruit
This European Standard was approved by CENELEC on 2017-01-02. CENELEC 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 CENELEC 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 CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,
Switzerland, Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2017 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 50332-3:2017 E
Contents Page
European foreword .3
Introduction .4
1 Scope .5
2 Normative references .5
3 Terms and definitions .5
4 Limits and calibration .5
4.1 General .5
4.2 Headset Type variations .6
4.3 Headset Fit-variation .6
5 Testing .6
5.1 General .6
5.2 Test of PMP with headphones/plugs included .6
5.3 Test of PMP with headphones/plugs not included .7
Annex A (Informative) Example of how the basic protections could be achieved .9
Annex B (Informative) Background information . 10
B.1 Motivation . 10
B.2 Loudness Normalization and EBU R128 . 11
B.3 Explanation of MEL . 11
B.4 Explanation of CSD . 11
B.5 Sound of non-PMP origin . 12
Bibliography . 13
European foreword
This document (EN 50332-3:2017) has been prepared by CLC/TC/108X “Safety of electronic
equipment within the fields of Audio/Video, Information Technology and Communication Technology”.
The following dates are fixed:
• latest date by which this document has to (dop) 2018-01-02
be implemented at national level by
publication of an identical national standard
or by endorsement
• latest date by which the national standards (dow) 2020-01-02
conflicting with this document have to
be withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
This document has been prepared under a mandate given to CENELEC by the European Commission
and the European Free Trade Association.
Introduction
Ideally, sound exposure assessment should be done with a normalized dosimeter located close to the
head (ears) of the user during the whole time of the exposure. However, in the context of leisure
activities, and for evident practical and economical reasons, this ideal methodology cannot be applied.
For a user of a Personal Music Player (PMP), a dosimeter would even have to sit inside the ear canal,
close to the tympanic membrane, with exposure data transformed to diffuse field equivalent. The aim
of this European Standard is to define an alternative and more applicable methodology for estimating
sound exposure from PMPs.
A PMP should inform the user about potentially harmful sound exposure, long-term as well as short-
term. This is accomplished by including a rolling calculation of sound dose, CSD, and an estimation of
momentary sound exposure level, MEL. In case CSD or MEL exceeds defined thresholds, the user is
warned and/or PMP gain is lowered. All protections should remain in place when listening to any kind
of typical PMP source (music, broadcast, game etc.), but not when, for instance, having a phone call.
Annex A shows a block diagram of how a complete protection system might be realized.
By adding actual PMP dose estimation to EN 50332-1 and EN 50332-2, rather than assuming the
average energy of programs and tracks, warnings become more relevant to the user. Relevance and
trustworthiness is essential for one of the standard's objectives: its educational value.
If estimation relies only on feed-forward principles, some uncertainty in the prediction of in vivo dose
will persist, for instance how earplugs or headphones are mounted, spread between transducers,
spectral properties of transducers, broken transducers etc. Some uncertainties can be effectively dealt
with when known combinations of PMPs and headphones are employed, while it may add to the
uncertainty when components are acquired separately.
Regardless that earphones, earbuds or headphones for use with PMPs may not exceed defined limits
with regard to sensitivity, it is acknowledged that extra uncertainty in the exposure estimation with
arbitrary combinations of PMPs and transducers will persist. However, with this part 3, actual electrical
measurement of source audio as part of dose estimation, a major contributor to warning errors in
general, is eliminated.
1 Scope
This European Standard specifies sound dose measurement, and the alerts associated, to reduce the
risk of listeners developing hearing impairment when using a Personal Music Player (PMP). The
standard does not cover exposure from other sources than PMPs.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
EN 50332-1:2013, Sound system equipment: Headphones and earphones associated with personal
music players - Maximum sound pressure level measurement methodology - Part 1: General method
for "one package equipment"
EN 50332-2:2013, Sound system equipment: Headphones and earphones associated with personal
music players - Maximum sound pressure level measurement methodology - Part 2: Matching of sets
with headphones if either or both are offered separately, or are offered as one package equipment but
with standardised connectors between the two allowing to combine components of different
manufacturers or different design
EN 62368-1, Audio/video, information and communication technology equipment - Part 1: Safety
requirements (IEC 62368-1:2014)
HD 483.1 S2, Sound system equipment - Part 1: General
3 Terms and definitions
For the purposes of this document, the terms and definitions of EN 50332-1:2013, EN 50332-2:2013
and EN 62368-1 apply.
4 Limits and calibration
4.1 General
EN 50332-3 builds on definitions from EN 50332-1 and EN 50332-2. Output limits and the calibration
of the electro-acoustic loop remain unchanged, but actual audio shall be taken into account to
determine maximum and minimum gain settings.
With the test signal, the relationship between sound exposure level and r.m.s. voltage remains the
same, e.g. 80 dB SPL and 15 mV (EN 50332-2), see Figure 1.
Figure 1 — Relationship between SPL and analog output voltage (mV r.m.s.),
CSD reference and MEL-based warning; for the standard test signal
4.2 Headset Type variations
If a manufacturer implements a means of detecting the sensitivity of a headset plugged in, or provides
a user selectable option, this sensitivity can be used to re-calibrate the electro-acoustic loop used for
the limits and dose calculation, as long as the acoustic limits remain unchanged.
4.3 Headset Fit-variation
If a manufacturer implements a system accounting for headset fit-variation, in which the acoustic level
estimates are more accurate than the proposed feed-forward system (for example, a closed-loop or
hybrid system), these levels can serve as the limits and inputs to the dose calculation, as long as the
acoustic limits remain unchanged.
5 Testing
5.1 General
This procedure verifies PMP sound exposure and dose estimation, based on the HATS method for
acoustic testing, see EN 50332-1. (Five times re-seat calibration ref).
The “programme simulation” test signal specified in EN 50332-1 and EN 50332−2 is here referred to
as “HD 483”. The same signal, but attenuated by 12 dB, is referred to as “HD 483-12L”.
Additional signals and more extensive procedures could be included to test the warning system
rigorously; for example, mark-space ratio noise, test music etc. To keep it simple
...