SIST EN 61606-3:2009

Audio and audiovisual equipment - Digital audio parts - Basic measurement methods of audio characteristics - Part 3: Professional use (IEC 61606-3:2008)

This part of IEC 61606 is applicable to the basic measurement methods of audio equipment for professional use. The definitions, measuring conditions and methods common to both consumer and professional equipment are described in the IEC 61606-1. This standard contains details of definitions and measuring conditions and methods applicable to professional equipment which differ from those described in IEC 61606-1. This standard excludes consideration of - measurement of low-quality audio devices, - measurement of low-bit-rate audio devices ('sub-band' or 'perceptual' coding devices), - measurement of devices which significantly modify time or frequency characteristics of the signal, such as pitch shifters or reverberators, - measurement of signals from analogue input to analogue output, beyond the most general, - EMC and safety related testing.

Audio- und audiovisuelle Geräte - Digitale Tonteile - Grundlegende Messverfahren der Audio-Eigenschaften - Teil 3: Professioneller Gebrauch (IEC 61606-3:2008)

Equipements audio et audiovisuels - Parties audionumériques - Méthodes fondamentales pour la mesure des caractéristiques audio - Partie 3 : Utilisations professionnelles (CEI 61606-3:2008)

La CEI 61606-3:2008 s'applique aux méthodes fondamentales pour la mesure des équipements audio à usage professionnel. Les définitions, les conditions et les méthodes de mesure communes aux équipements grand public et professionnels sont décrites dans la CEI 61606-1. Cette norme contient des détails relatifs aux définitions et aux conditions et méthodes de mesure applicables aux équipements professionnels qui sont différentes de celles décrites dans la CEI 61606-1.
Cette publication doit être lue conjointement avec la CEI 61606-1:2009.

Avdio in avdiovizualna oprema - Digitalni avdio deli - Osnovne merilne metode zvokovnih karakteristik - 3. del: Profesionalna uporaba (IEC 61606-3:2008)

General Information

• Status: Published
• Publication Date: 03-Dec-2008
• ICS: 33.160.30 - Audio systems
• Technical Committee: AVM - Audio, video and multimedia systems and equipment
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 28-Nov-2008
• Due Date: 02-Feb-2009
• Completion Date: 04-Dec-2008
• Ref Project: EN 61606-3:2008 - Audio and audiovisual equipment - Digital audio parts - Basic measurement methods of audio characteristics - Part 3: Professional use

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 61606-3:2009
01-januar-2009
Avdio in avdiovizualna oprema - Digitalni avdio deli - Osnovne merilne metode
zvokovnih karakteristik - 3. del: Profesionalna uporaba (IEC 61606-3:2008)
Audio and audiovisual equipment - Digital audio parts - Basic measurement methods of
audio characteristics - Part 3: Professional use (IEC 61606-3:2008)
Audio- und audiovisuelle Geräte - Digitale Tonteile - Grundlegende Messverfahren der
Audio-Eigenschaften - Teil 3: Professioneller Gebrauch (IEC 61606-3:2008)
Equipements audio et audiovisuels - Parties audionumériques - Méthodes
fondamentales pour la mesure des caractéristiques audio - Partie 3 : Utilisations
professionnelles (CEI 61606-3:2008)
Ta slovenski standard je istoveten z: EN 61606-3:2008
ICS:
33.160.30 Avdio sistemi Audio systems
SIST EN 61606-3:2009 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 61606-3:2009

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SIST EN 61606-3:2009

EUROPEAN STANDARD
EN 61606-3

NORME EUROPÉENNE
November 2008
EUROPÄISCHE NORM

ICS 33.160.30


English version


Audio and audiovisual equipment -
Digital audio parts -
Basic measurement methods of audio characteristics -
Part 3: Professional use
(IEC 61606-3:2008)


Equipements audio et audiovisuels -  Audio- und audiovisuelle Geräte -
Parties audionumériques - Digitale Tonteile -
Méthodes fondamentales pour Grundlegende Messverfahren
la mesure des caractéristiques audio - der Audio-Eigenschaften -
Partie 3: Utilisations professionnelles Teil 3: Professioneller Gebrauch
(CEI 61606-3:2008) (IEC 61606-3:2008)




This European Standard was approved by CENELEC on 2008-11-01. 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 Central Secretariat 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 Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the
Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels


© 2008 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61606-3:2008 E

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SIST EN 61606-3:2009
EN 61606-3:2008 - 2 -
Foreword
The text of document 100/1428/FDIS, future edition 1 of IEC 61606-3, prepared by IEC TC 100, Audio,
video and multimedia systems and equipment, was submitted to the IEC-CENELEC parallel vote and was
approved by CENELEC as EN 61606-3 on 2008-11-01.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2009-08-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2011-11-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 61606-3:2008 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:
IEC 60268-3 NOTE  Harmonized as EN 60268-3:2000 (not modified).
IEC 61938 NOTE  Harmonized as EN 61938:1997 (not modified).
__________

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SIST EN 61606-3:2009
- 3 - EN 61606-3:2008
Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications

The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.

NOTE  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.

Publication Year Title EN/HD Year

1) 2)
IEC 60268-1 - Sound system equipment - HD 483.1 S2 1989
Part 1: General


1) 2)
IEC 60268-2 - Sound system equipment - HD 483.2 S2 1993
Part 2: Explanation of general terms and
calculation methods


1) 2)
IEC 60958-1 - Digital audio interface - EN 60958-1 2008
Part 1: General


1) 2)
IEC 61260 - Electroacoustics - Octave-band EN 61260 1995
and fractional-octave-band filters


1) 2)
IEC 61606-1 - Audio and audiovisual equipment - EN 61606-1 2004
Digital audio parts - Basic measurement
methods of audio characteristics -
Part 1: General


AES11 2003 AES recommended practice for digital audio - -
engineering - Synchronization of digital audio
equipment in studio operations




1)
Undated reference.
2)
Valid edition at date of issue.

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SIST EN 61606-3:2009

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SIST EN 61606-3:2009
IEC 61606-3
Edition 1.0 2008-10
INTERNATIONAL
STANDARD


Audio and audiovisual equipment – Digital audio parts – Basic measurement
methods of audio characteristics –
Part 3: Professional use


INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
X
ICS 33.160.30 ISBN 2-8318-1008-6
® Registered trademark of the International Electrotechnical Commission

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SIST EN 61606-3:2009
– 2 – 61606-3 © IEC:2008(E)
CONTENTS
FOREWORD.4
1 Scope.6
2 Normative references .6
3 Terms and definitions .7
4 Rated values .10
5 Measuring conditions.10
5.1 Environmental conditions .10
5.2 Power supply.10
5.3 Test signal frequencies .11
5.4 Standard settings .11
5.5 Preconditioning .11
5.6 Measuring instruments .11
5.6.1 General .11
5.6.2 Signal generator .11
5.6.3 Signal analyzer.12
6 Measurement methods .16
6.1 Overview .16
6.2 General characteristics.16
6.2.1 Linear response.16
6.2.2 Amplitude non-linearity .21
6.2.3 Noise.26
6.2.4 Interference products.28
6.2.5 Sampling effects.30
6.3 Input/output characteristics .32
6.3.1 Analogue input characteristics .32
6.3.2 Analogue output characteristics.34
6.3.3 Digital input characteristics.35
6.3.4 Digital output characteristics.36
Annex A (normative) Alternative measurement methods .37
Bibliography.41

Figure 1 – Signal generator .11
Figure 2 – Wideband amplitude.13
Figure 3 – In-band amplitude .13
Figure 4 – Out-of-band amplitude .13
Figure 5 – Selective amplitude.13
Figure 6 – Residual amplitude.13
Figure 7 – Weighted amplitude .14
Figure 8 – Gain method .16
Figure 9 – Frequency response method .17
Figure 10 – Maximum input and output amplitude method.18
Figure 11 – Distortion-and-noise method .21
Figure 12 – Distortion and noise versus frequency method .21
Figure 13 – Distortion and noise versus amplitude method .22

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SIST EN 61606-3:2009
61606-3 © IEC:2008(E) – 3 –
Figure 14 – Individual harmonic distortion method .22
Figure 15 – Total harmonic distortion method .22
Figure 16 – Largest spurious signal method.23
Figure 17 – Intermodulation method.23
Figure 18 – Intermodulation method.24
Figure 19 – Amplitude-dependent gain method .25
Figure 20 – Intrinsic signal modulation products method .25
Figure 21 – Low-amplitude noise modulation method.26
Figure 22 – Idle-channel noise method .26
Figure 23 – Idle-channel noise spectrum method .27
Figure 24 – Dynamic range method .27
Figure 25 – Out-of-band noise ratio method .27
Figure 26 – Channel separation method.28
Figure 27 – Non-linear cross-talk method.29
Figure 28 – Power-line (mains) related products method.30
Figure 29 – Suppression of the aliasing components method .30
Figure 30 – Suppression of imaging components method.31
Figure 31 – Sampling jitter susceptibility method .32
Figure 32 – Analogue full-scale input amplitude method .32
Figure 33 – Overload behaviour method .33
Figure 34 – Common-mode rejection ratio method .33
Figure 35 – Analogue full-scale output amplitude method .34
Figure 36 – Output balance method .35

Table A.1 – Stimulus wavetables .38

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INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

AUDIO AND AUDIOVISUAL EQUIPMENT –
DIGITAL AUDIO PARTS –
BASIC MEASUREMENT METHODS
OF AUDIO CHARACTERISTICS –

Part 3: Professional use


FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61606-3 has been prepared by IEC technical committee 100:Audio,
video and multimedia systems and equipment.
The text of this standard is based on the following documents:
FDIS Report on voting
100/1428/FDIS 100/1453/RVD

Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

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SIST EN 61606-3:2009
61606-3 © IEC:2008(E) – 5 –
A list of all parts of the IEC 61606 series, under the general title Audio and audiovisual
equipment – Digital audio parts – Basic measurement methods of audio characteristics, can
be found on the IEC website.
This International Standard is to be used in conjunction with IEC 61606-1.
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in
the data related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.

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AUDIO AND AUDIOVISUAL EQUIPMENT –
DIGITAL AUDIO PARTS –
BASIC MEASUREMENT METHODS
OF AUDIO CHARACTERISTICS –

Part 3: Professional use



1 Scope
This part of IEC 61606 is applicable to the basic measurement methods of audio equipment
for professional use.
The definitions, measuring conditions and methods common to both consumer and
professional equipment are described in the IEC 61606-1.
This standard contains details of definitions and measuring conditions and methods applicable
to professional equipment which differ from those described in IEC 61606-1.
This standard excludes consideration of
− measurement of low-quality audio devices,
− measurement of low-bit-rate audio devices (‘sub-band’ or ‘perceptual’ coding devices),
− measurement of devices which significantly modify time or frequency characteristics of the
signal, such as pitch shifters or reverberators,
− measurement of signals from analogue input to analogue output, beyond the most general,
− EMC and safety related testing.
2 Normative references
The following referenced documents are indispensable for the application of this document.
For dated references, only the edition cited applies. For undated references, the latest edition
of the referenced document (including any amendments) applies.
IEC 60268-1, Sound system equipment – Part 1: General
IEC 60268-2, Sound system equipment – Part 2: Explanation of general terms and calculation
methods
IEC 60958-1, Digital audio interface – Part 1: General
IEC 61260, Electroacoustics – Octave-band and fractional-octave-band filters
IEC 61606-1, Audio and audiovisual equipment – Digital audio parts – Basic measurement
methods of audio characteristics – Part 1: General
AES11-2003, AES Recommended Practice for Digital Audio Engineering – Synchronization of
digital audio equipment in studio operations

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SIST EN 61606-3:2009
61606-3 © IEC:2008(E) – 7 –
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
aliasing components
see definition in IEC 61606-1
3.2
analogue full-scale input and output amplitude
when applied to an analogue input of the EUT, it produces digital full-scale amplitude within
the EUT; conversely, the analogue output full-scale amplitude is that which is produced at an
analogue output from the EUT by a digital full-scale amplitude within the EUT
NOTE 1 Sometimes the range of an analogue input or output path may be less than that corresponding to digital
full-scale amplitude. For this reason, analogue full-scale input and output amplitudes are usually inferred by driving
the converters at a lower amplitude (see 6.3.1.1 and 6.3.2.1).
NOTE 2 The ideal values of these amplitudes cannot be defined within the standard since they are different for
different EUTs, and may be modally variable for a single EUT.
NOTE 3 Where these values are unknown for an EUT at the outset of testing, they should generally be
established first (using the methods described in 6.3.1.1 and 6.3.2.1 since it may subsequently be necessary, for
example, to drive an analogue input at –60 dB or to measure an amplitude at an analogue output in dB
FS FS
relative to a digital stimulus.
3.3
coding format
a numerical convention used to represent digital audio data at the inputs or outputs of the
EUT
NOTE This standard is primarily intended to be applied to EUTs which transact digital audio signals expressed as a
stream of LPCM (Linear Pulse Code Modulation) samples; that is, a stream of binary words, directly representing
the amplitudes of successive audio samples quantised at the sampling frequency, and rendered as binary 2's
complement numbers. Positive analogue voltages correspond to positive digital sample values (that is, 2’s
complement numbers whose most-significant bit (MSB) is zero). Many of the methods described in the standard are
applicable to other coding formats.
3.4
decibels full-scale
dB
FS
the r.m.s. amplitude of a sinusoid described in 3.10 is defined as 0 dB , where the amplitude
FS
of any signal can be defined in dB as 20 times the common logarithm of the ratio of the
FS
r.m.s. amplitude of the signal to that of the signal defined in 3.10
NOTE Analogue amplitudes at the input or output of an EUT can be expressed in dB by referring to the
FS
analogue full-scale input or output amplitudes as defined in 3.2.
3.5
digital audio interface
a physical medium upon which digital audio data are transferred into or out of the EUT
NOTE Digital audio interfaces may include packaged media (such as in the case of a CD player) or
radio-frequency (RF) carriers (such as in the case of a set-top-box) as well as conventional copper or optical digital
interconnections.
3.6
digital audio signal
see definition in IEC 61606-1
3.7
digital zero
see definition in IEC 61606-1

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3.8
equipment under test
EUT
see definition in IEC 61606-1
NOTE In structuring an equipment or installation specification, it is important to consider the way in which the
different elements of the equipment might best be segmented for the purposes of the specification or measurement.
A basic D/A converter, for example, would represent a simple EUT with ‘General characteristics’, ‘Digital input
characteristics’ and ‘Analogue output characteristics’. But consider a large studio mixing console, which may have
many different functional blocks, and many different inputs and outputs of different types and in different domains.
Such a mixing console example might be considered as a collection of different elements; for example, ‘analogue
line inputs’, ‘analogue mic inputs’, ‘AES3 inputs’, ‘channel equalizers’, ‘mix bus processors’ etc. Typically, different
measurement criteria are applicable to each different element, and different performance levels might be specified.
In such a case each element or subsystem should, where possible, be considered as a discrete ‘EUT’ and should
be specified and measured individually. In addition, typical signal paths through the entire equipment may also be
specified, and their performance criteria stated as a single EUT.
3.9
folding frequency
half the sampling frequency of the EUT
NOTE 1 Signals above this frequency applied to the EUT are subject to aliasing.
NOTE 2 Complex EUTs may have an input folding frequency and an output folding frequency which are different.
In such cases, where input or output is unspecified, the folding frequency shall refer to the lower frequency.
3.10
full-scale amplitude
FS
amplitude of a 997 Hz sinusoid whose peak positive sample just reaches positive digital full-
scale (in 2’s-complement a binary value of 0111…1111 to make up the word length) and
whose peak negative sample just reaches a value one away from negative digital full-scale
(1000…0001 to make up the word length) leaving the maximum negative code (1000…0000)
unused
3.11
high and low interference frequencies
moderately high and low signal frequencies of 15 kHz and 60 Hz respectively at which certain
interference effects may be quoted if a graphical report is not required
3.12
in-band amplitude
an amplitude measurement incorporating a standard low-pass filter so as to exclude out-of-
band components above the upper band-edge frequency
3.13
in-band frequency range
see definition in IEC 61606-1
3.14
input word length
the maximum audio word length which can be applied to a digital input of the EUT at its
present settings, for which the least significant bit is not ignored
3.15
interface jitter
timing errors in the transitions of a digital audio carrier or reference sync, owing to cabling
effects or jitter in the clock of the sourcing equipment

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3.16
jitter susceptibility
the effect on EUT performance as a result of sampling jitter caused by interface jitter on the
incoming reference sync
3.17
maximal measuring amplitude
a signal amplitude of –1 dB , close to (but below) full scale amplitude, which is applied to
FS
the EUT in certain of the described methods
NOTE This definition can apply to either a digital or an analogue signal (see 3.4).
3.18
normal load impedance
required differential input impedance of the analogue measuring equipment defined as 100 kΩ
or more, in parallel with not more than 500 pF in this standard
3.19
normal measuring amplitude
a signal amplitude of −20 dB , representative of a typical operating amplitude, which is
FS
applied to the EUT in certain of the described methods

NOTE This definition can apply to either a digital or an analogue signal (see 3.4).
3.20
normal measuring frequency
a signal frequency of 997 Hz, representative of a typical mid-range frequency, which is
applied to the EUT in certain of the described methods
3.21
normal source impedance
required differential output impedance of the analogue measuring equipment defined as 50 Ω
or less for a balanced output and 25 Ω or less for an unbalanced output in this standard
3.22
out-of-band amplitude
amplitude measurement incorporating a standard out-of-band filter so as to exclude in-band
components below the upper band-edge frequency
3.23
out-of-band frequency range
frequency range from the folding frequency to 192 kHz (or some other stated maximum)
NOTE Signals applied to the EUT input in this frequency range are subject to aliasing.
3.24
output word length
number of significant bits transmitted by a digital output of the EUT at its present settings, of
which none is continuously zero
3.25
residual amplitude
an amplitude measurement incorporating a standard band-reject filter to suppress the effects
of an unwanted frequency, usually the stimulus frequency
3.26
sampling frequency
f
s
the rate at which audio samples are processed within the EUT

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NOTE Complex EUTs may have an input sampling frequency and an output sampling frequency which are
different. In such cases, where input or output is unspecified, the sampling frequency shall refer to the lower
frequency.
3.27
samplin
...