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AS 60118.2-2007

Withdrawn

Withdrawn

A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.

Hearing aids - Hearing aids with automatic gain control circuits

Available format(s)

Hardcopy , PDF 1 User , PDF 3 Users , PDF 5 Users , PDF 9 Users

Withdrawn date

19-09-2019

Language(s)

English

Published date

20-02-2007

€62.23
Excluding VAT

3 - AS 60118.2-2007 Hearing aids Part 2: Hearing aids with automatic gain control circuits
4 - PREFACE
5 - CONTENTS
7 - 1 Scope
7 - 2 Object
8 - 3 Conditions
8 - 3.1 General conditions
8 - 4 Explanation of terms
8 - 4.1 Automatic gain control ( AGC)
8 - 4.2 Steady- state input/ output graph
8 - 4.3 Lower AGC limit or AGC threshold
8 - 4.4 Compression ratio ( between specified input sound pressure level values)
8 - 4.5 Dynamic output characteristics
8 - 4.6 Attack time
8 - 4.6.1 Attack time for the normal dynamic range of speech
9 - 4.6.2 High level attack time
9 - 4.7 Recovery time
9 - 4.7.1 Recovery time for the normal dynamic range of speech
9 - 4.7.2 High level recovery time
9 - 4.8 AGC activated frequency response
9 - 4.9 Operating frequency range of the AGC
9 - 4.10 Overall root- mean- square sound pressure level ( overall r. m. s. SPL)
9 - 4.11 One- third- octave band level
9 - 4.12 Auto- spectrum ( power spectrum)
9 - 4.13 Cross- spectrum ( GAB)
10 - 4.14 Coherence
10 - 4.15 Synchronous analysis
10 - 5 Steady- state input/ output graph
10 - 5.1
10 - 5.2 Methods of measurement
10 - 6 Dynamic output characteristics
10 - 6.1 Characteristics to be measured
11 - 6.2 Methods of measurement
11 - 6.2.1 Dynamic output characteristics for speech levels
11 - 6.2.2 Dynamic output characteristics for high level input
11 - 7 Non- linear distortion
11 - 7.1 Transients
11 - 7.2 Harmonic distortion
11 - 7.2.1 Characteristics to be specified
11 - 7.2.2 Methods of measurement
12 - 7.3 Intermodulation distortion
12 - 8 Effect on steady- state and dynamic performance with respect to variation in battery or supply voltage
12 - 9 AGC activated frequency response of hearing aids with a single channel
12 - 9.1 Introduction
12 - 9.2 General conditions
12 - 9.3 Test equipment
13 - 9.4 Test conditions
13 - 9.5 Measurement
13 - 9.5.1 Determination of the operating range of the AGC
13 - 9.5.2 Measurement of the AGC activated frequency response
14 - 9.6 Frequency response recording chart
14 - 10 Frequency response of hearing aids with AGC circuits in operation
14 - 10.1 General
15 - 10.2 Test enclosure
15 - 10.3 Test conditions
15 - 10.3.1 Noise input signal
16 - 10.4 Test equipment
17 - 10.5 Measurements of frequency responses
17 - 10.5.1 Comprehensive frequency responses and basic frequency response ( acoustic gain)
17 - 10.5.1.1 Cross- spectrum method
17 - 10.5.1.2 Auto- spectrum method
18 - 10.5.1.3 Swept filter method
18 - 10.6 Frequency response recording chart
19 - Annex A (informative) Examples of measuring systems
22 - Annex B (informative) Smoothed data presentation
23 - Annex C (informative) Bibliography

Adopts IEC 60118-2 to apply to hearing aids of any type with automatic gain control (AGC) circuits.

Committee
AV-003
DocumentType
Standard
ISBN
0 7337 7915 8
Pages
17
ProductNote
Withdrawn 19-09-2019.
PublisherName
Standards Australia
Status
Withdrawn
Supersedes

Standards Relationship
IEC 60118-2:1983 Identical
IEC 60118-2:1983/AMD2:1997 Identical
IEC 60118-2:1983/AMD1:1993 Identical

Originated as part of AS 1088-1971.
Previous edition AS 1088.2-1987.
Revised and redesignated as AS 60118.2-2007.

AS/NZS 4476:1997 Acoustics - Octave-band and fractional-octave-band-filters
AS 60118.6-2007 Hearing aids - Characteristics of electrical input circuits for hearing aids
AS 2928-1987 Occluded-ear simulator for the measurement of earphones coupled to the ear by ear inserts
AS 60118.0-2007 Hearing aids Measurement of electroacoustical characteristics
AS 60118.1-2007 Hearing aids - Hearing aids with induction pick-up coil input

AS 60118.7-2007 Hearing aids Measurement of the performance characteristics of hearing aids for production, supply and delivery quality assurance purposes (Reconfirmed 2019)

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