EN 60118-2:1995
(Main)Hearing aids - Part 2: Hearing aids with automatic gain control circuits
Hearing aids - Part 2: Hearing aids with automatic gain control circuits
Gives uniform methods for specifying dynamic and static performance characteristics of hearing aids with automatic gain control circuits together with the relevant methods of measurement for these characteristics.
Hörgeräte - Teil 2: Hörgeräte mit automatischer Verstärkungsregelung
Appareils de correction auditive - Partie 2: Appareils de correction auditive comportant des commandes automatiques de gain
Donne des méthodes homogènes pour spécifier, aussi bien en régime transitoire qu'en régime permanent, les caractéristiques des appareils de correction auditive comportant des circuits de commande automatique de gain, ainsi que les méthodes de mesure de ces caractéristiques.
Hearing aids - Part 2: Hearing aids with automatic gain control circuits (IEC 60118-2:1983 + A1:1993)
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Standards Content (Sample)
SLOVENSKI SIST EN 60118-2:2004
STANDARD
julij 2004
Hearing aids - Part 2: Hearing aids with automatic gain control circuits (IEC 60118-
2:1983 + A1:1993)
ICS 11.180.15 Referenčna številka
SIST EN 60118-2:2004(en)
© Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno
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NORME CEI
IEC
INTERNATIONALE
118-2
INTERNATIONAL
Deuxième édition
STANDARD
Second edition
1983-01
Appareils de correction auditive
Deuxième partie:
Appareils de correction auditive comportant
des commandes automatiques de gain
Hearing aids
Part 2:
Hearing aids with automatic gain control circuits
© IEC 1983 Droits de reproduction réservés — Copyright - all rights reserved
Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in
utilisée sous quelque forme que ce soit et par aucun any form or by any means, electronic or mechanical,
including photocopying and microfilm, without permission in
procédé, électronique ou mécanique, y compris la photo-
copie et les microfilms, sans l'accord écrit de l'éditeur. writing from the publisher.
International Electrotechnical Commission 3, rue de Varembé Geneva, Switzerland
Telefax: +41 22 919 0300 e-mail: inmail@iec.ch IEC web site http: //www.iec.ch
CODE PRIX
Commission Electrotechnique Internationale
J
PRICE CODE
International Electrotechnical Commission
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vigueur
Pour prix, voir catalogue en
• •
For price, see current catalogue
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— 3 —
118-2 © IEC 1983
CONTENTS
Page
FOREWORD 5
PREFACE 5
Clause
1. Scope 7
Object 7
2.
3. Conditions 9
9
4. Explanation of terms
9
4.1 Automatic gain control (AGC)
9
4.2 Steady-state input/output graph
9
4.3 Lower AGC limit or AGC threshold
9
4.4 Compression ratio (between specified input sound pressure level values)
9
4.5 Dynamic output characteristics
11
4.6 Attack time
11
4.7 Recovery time
11
Steady-state input/output graph 5.
5.1 Graph showing the relation between input sound pressure level and output sound pressure
11
level
13
5.2 Methods of measurement
13
Dynamic output characteristics 6.
13
Characteristics to be measured 6.1
13
6.2 Methods of measurement
15
7. Non-linear distortion
15
7.1 Transients
15
7.2 Harmonic distortion
15
7.3 Intermodulation distortion
Effect on steady-state and dynamic performance with respect to variation in battery or supply
8.
15
voltage
16
FIGURES
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118-2 © IEC 1983 — 5 —
INTERNATIONAL ELECTROTECHNICAL COMMISSION
HEARING AIDS
Part 2: Hearing aids with automatic gain control circuits
FOREWORD
1) The formal decisions or agreements of the IEC on technical matters, prepared by Technical Committees on which all the
National Committees having a special interest therein are represented, express, as nearly as possible, an international
consensus of opinion on the subjects dealt with.
They have the form of recommendations for international use and they are accepted by the National Committees in that
2)
sense.
3) In order to promote international unification, the IEC expresses the wish that all National Committees should adopt the text
of the IEC recommendation for their national rules in so far as national conditions will permit. Any divergence between the
IEC recommendation and the corresponding national rules should, as far as possible, be clearly indicated in the latter.
PREFACE TO THE FIRST EDITION
This standard has been prepared by IEC Technical Committee No.29: Electroacoustics.
Work was started at the meeting held in Moscow in 1974.
The first draft was discussed at the meeting held in Gaithersburg in 1976. As a result of this meeting, a draft, Document
ix Months' Rule in September 1976.
29(Central Office)107, was submitted to the National Committees for approval under the S
The following countries voted explicitly in favour of publication:
Spain
Australia Germany
Belgium Italy Sweden
Switzerland
Canada Japan
Netherlands Turkey
Czechoslovakia
Denmark Norway United Kingdom
United States of America
Egypt Romania
South Africa (Republic of)
France
PREFACE TO THE SECOND EDITION
This second edition comprises the first edition, issued in 1979, and editorial amendments which are due to the issuing of IEC
Publication 118-0 (1983).
Other IEC publications quoted in this standard:
Publications Nos. 118-0: Hearing Aids, Part 0: Measurement of Electroacoustical Characteristics.
268-8: Sound System Equipment, Part 8: Automatic Gain Control Devices.
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118-2 © IEC 1983 7
HEARING AIDS
Part 2: Hearing aids with automatic gain control circuits
1. Scope
1.1 This standard applies to the hearing aids of any type with automatic gain control (AGC) circuits.
This standard
...
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