EN 61606-2:2009

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Avdio in avdiovizualna oprema - Digitalni avdio deli - Osnovne merilne metode zvokovnih karakteristik - 2. del: Splošna (porabniška) uporaba (IEC 61606-2:2009)Audio- und audiovisuelle Geräte - Digitale Tonteile - Grundlegende Messverfahren der Audio-Eigenschaften - Teil 2: Allgemeingebrauch (CEI 61606-2:2009)Equipements audio et audiovisuels - Parties audionumériques - Méthodes fondamentales pour la mesure des caractéristiques audio - Partie 2 : Utilisation par le consommateur (IEC 61606-2:2009)Audio and audiovisual equipment - Digital audio parts - Basic measurement methods of audio characteristics - Part 2: Consumer use (IEC 61606-2:2009)33.160.30Avdio sistemiAudio systemsICS:Ta slovenski standard je istoveten z:EN 61606-2:2009SIST EN 61606-2:2010en01-februar-2010SIST EN 61606-2:2010SLOVENSKI
STANDARDSIST EN 61606-2:20041DGRPHãþD

EUROPEAN STANDARD EN 61606-2 NORME EUROPÉENNE
EUROPÄISCHE NORM November 2009
CENELEC European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: Avenue Marnix 17, B - 1000 Brussels
© 2009 CENELEC -
All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61606-2:2009 E
ICS 33.160.01 Supersedes EN 61606-2:2004
English version
Audio and audiovisual equipment -
Digital audio parts -
Basic measurement methods of audio characteristics -
Part 2: Consumer use (IEC 61606-2:2009)
Equipements audio et audiovisuels -
Parties audionumériques -
Méthodes fondamentales
pour la mesure
des caractéristiques audio -
Partie 2: Utilisation par le consommateur (CEI 61606-2:2009)
Audio- und audiovisuelle Geräte -
Digitale Tonteile -
Grundlegende Messverfahren
der Audio-Eigenschaften -
Teil 2: Allgemeingebrauch (IEC 61606-2:2009)
This European Standard was approved by CENELEC on 2009-09-01. 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.
at national level by publication of an identical
national standard or by endorsement
(dop)
2010-06-01 – latest date by which the national standards conflicting
with the EN have to be withdrawn
(dow)
2012-09-01 Annex ZA has been added by CENELEC. __________ Endorsement notice The text of the International Standard IEC 61606-2:2009 was approved by CENELEC as a European Standard without any modification. __________ SIST EN 61606-2:2010

- 3 - EN 61606-2:2009 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
IEC 60268-2 –1) Sound system equipment -
Part 2: Explanation of general terms and calculation methods HD 483.2 S2
19932)
IEC 60958 Series Digital audio interface
EN 60958 Series
IEC 61606-1 2009 Audio and audiovisual equipment - Digital audio parts - Basic measurement methods of audio characteristics -
Part 1: General EN 61606-1 2009
IEC 61672-1 –1) Electroacoustics - Sound level meters -
Part 1: Specifications EN 61672-1 20032)
IEC 61883-6 –1) Consumer audio/video equipment - Digital interface -
Part 6: Audio and music data transmission EN 61883-6 20052)
IEC 61938 –1) Audio, video and audiovisual systems - Interconnections and matching values - Preferred matching values of analogue signalsEN 61938 + corr. February 19972)1997
1) Undated reference. 2) Valid edition at date of issue. SIST EN 61606-2:2010

IEC 61606-2Edition 2.0 2009-07INTERNATIONAL STANDARD
Audio and audiovisual equipment – Digital audio parts – Basic measurement methods of audio characteristics –
Part 2: Consumer use
INTERNATIONAL ELECTROTECHNICAL COMMISSION WICS 33.160.01 PRICE CODEISBN 2-8318-1051-7
– 2 – 61606-2 © IEC:2009(E) CONTENTS FOREWORD.5 1 Scope.7 2 Normative references.7 3 Terms, definitions, explanations and rated values.7 3.1 Terms and definitions.7 3.2 Explanation of terms “jitter”.8 3.3 Digital interface for measurement.8 3.4 Rated values.8 4 Measuring conditions.8 4.1 General.8 4.2 Environmental conditions.8 4.3 Power supply.8 4.4 Test signal frequencies.8 4.5 Standard setting.8 4.6 Preconditioning.9 4.7 Measuring instruments.9 4.7.1 General.9 4.7.2 Digital level meter.9 4.7.3 Distortion meter.9 4.7.4 Analogue weighting filter.10 4.7.5 Digital weighting filter.10 4.7.6 Digital spectrum analyzer.10 5 Methods of measurement (digital-in/analogue-out).10 5.1 General.10 5.2 Input/output characteristics.10 5.2.1 Maximum output amplitude.10 5.2.2 Gain difference between channels.11 5.3 Frequency characteristics.11 5.3.1 Frequency response.11 5.3.2 Group delay (phase linearity).12 5.4 Noise characteristics.13 5.4.1 Signal-to-noise ratio.13 5.4.2 Dynamic range.13 5.4.3 Out-of-band noise ratio.14 5.4.4 Channel separation.15 5.5 Distortion characteristics.16 5.5.1 Level non-linearity.16 5.5.2 Distortion and noise.17 5.5.3 Intermodulation.17 6 Methods of measurement (analogue-in/digital-out).18 6.1 General.18 6.2 Input/output characteristics.18 6.2.1 Analogue to digital level calibration.18 6.2.2 Maximum allowable input amplitude.20 6.2.3 Gain difference between channel and tracking error.21 6.3 Frequency characteristics.23 SIST EN 61606-2:2010

61606-2 © IEC:2009(E) – 3 – 6.3.1 Frequency response.23 6.3.2 Group delay.24 6.4 Noise characteristics.25 6.4.1 Signal-to-noise ratio (idle channel noise).25 6.4.2 Dynamic range.27 6.4.3 Folded noise.28 6.4.4 Cross-talk.29 6.4.5 Channel separation.31 6.5 Distortion characteristics.33 6.5.1 Level non-linearity.33 6.5.2 Distortion and noise.34 6.5.3 Intermodulation.35
Figure 1 – Connection diagram of equipment.11 Figure 2 – Connection diagram of equipment.11 Figure 3 – Connection diagram of equipment.12 Figure 4 – Connection diagram of equipment.13 Figure 5 – Connection diagram of equipment.14 Figure 6 – Connection diagram of equipment.14 Figure 7 – Connection diagram of equipment.15 Figure 8 – Connection diagram of equipment.16 Figure 9 – Connection diagram of equipment.17 Figure 10 – Connection diagram of equipment.17 Figure 11 – Connection diagram of equipment.18 Figure 12 – Connection diagram of equipment.19 Figure 13 – Connection diagram of equipment.20 Figure 14 – Connection diagram of equipment.20 Figure 15 – Connection diagram of equipment.21 Figure 16 – Connection diagram of equipment.22 Figure 17 – Connection diagram of equipment.23 Figure 18 – Connection diagram of equipment.23 Figure 19 – Connection diagram of equipment.24 Figure 20 – Connection diagram of equipment.24 Figure 21 – Connection diagram of equipment.25 Figure 22 – Connection diagram of equipment.26 Figure 23 – Connection diagram of equipment.27 Figure 24 – Connection diagram of equipment.27 Figure 25 – Connection diagram of equipment.28 Figure 26 – Connection diagram of equipment.28 Figure 27 – Connection diagram of equipment.30 Figure 28 – Connection diagram of equipment.30 Figure 29 – Connection diagram of equipment.31 Figure 30 – Connection diagram of equipment.32 Figure 31 – Connection diagram of equipment.33 Figure 32 – Connection diagram of equipment.33 SIST EN 61606-2:2010

– 4 – 61606-2 © IEC:2009(E) Figure 33 – Connection diagram of equipment.34 Figure 34 – Connection diagram of equipment.34 Figure 35 – Connection diagram of equipment.35 Figure 36 – Connection diagram of equipment.36
Table 1 – Levels for measurement.16 Table 2 – Interfering frequency.29
61606-2 © IEC:2009(E) – 5 – INTERNATIONAL ELECTROTECHNICAL COMMISSION ____________
AUDIO AND AUDIOVISUAL EQUIPMENT –
DIGITAL AUDIO PARTS –
BASIC MEASUREMENT METHODS
OF AUDIO CHARACTERISTICS –
Part 2: Consumer 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 61606-2 has been prepared by IEC technical committee 100: Audio, video and multimedia systems and equipment. This second edition cancels and replaces the first edition published in 2003. It constitutes a technical revision. The significant technical changes with respect to the first edition are the following: • changed the period of preconditioning; • add A weighting filter in measuring instruments; • correct the wrong reference number; • some inappropriate descriptions have been improved. SIST EN 61606-2:2010

– 6 – 61606-2 © IEC:2009(E) The text of this standard is based on the following documents: FDIS Report on voting 100/1548/FDIS 100/1582/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 part is to be used in conjunction with IEC 61606-1, General. 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 publication has been drafted in accordance with the ISO/IEC Directives, Part 2. 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.
61606-2 © IEC:2009(E) – 7 – AUDIO AND AUDIOVISUAL EQUIPMENT –
DIGITAL AUDIO PARTS –
BASIC MEASUREMENT METHODS
OF AUDIO CHARACTERISTICS –
Part 2: Consumer use
1 Scope This part of IEC 61606 is applicable to the basic measurement methods of the audio characteristics of the digital audio part of audio and audiovisual equipment for consumer use. The common measuring conditions and methods are described in IEC 61606-1. This International Standard specify conditions and methods of measurement for consumer equipment are given in this standard. 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 60268-2, Sound system equipment – Part 2: Explanation of general terms and calculation methods IEC 60958 (all parts), Digital audio interface IEC 61606-1:2009, Audio and audiovisual equipment – Digital audio parts – Basic measurement methods of audio characteristics – Part 1: General IEC 61672-1, Electroacoustics – Sound level meters – Part 1: Specifications IEC 61883-6, Consumer audio/video equipment – Digital interface – Part 6: Audio and music data transmission protocol IEC 61938, Audio, video and audiovisual systems – Interconnections and matching values – Preferred matching values of analogue signals 3 Terms, definitions, explanations and rated values 3.1 Terms and definitions For the purposes of this document, the terms and definitions given in IEC 61606-1 as well as the following apply. 3.1.1
analogue full-scale amplitude nominal signal level of an EUT corresponding to the digital full-scale level NOTE In order to accommodate the EUT in an audio system, it is recommended that the analogue full scale amplitude has the value defined in IEC 61938. In the case of general purpose audio for consumer equipment, the amplitude is 2 V r.m.s. SIST EN 61606-2:2010

– 8 – 61606-2 © IEC:2009(E) 3.1.2
normal load impedance value defined in IEC 61938, or in the case of general purpose audio for consumer equipment, 22 kΩ 3.1.3
normal measuring level analogue signal level equal to –20 dB of analogue full-scale amplitude 3.1.4
normal source impedance value defined in IEC 61938, or in the case of general purpose audio for consumer equipment, 2,2 kΩ 3.2 Explanation of terms “jitter” See 3.2 of IEC 61606-1. 3.3 Digital interface for measurement This standard can be applied to IEC 60958 or IEC 61883-6. Other interfaces having the same specification as in 3.1 of IEC 61606-1 may also be used. 3.4 Rated values For a full explanation of these terms, see IEC 60268-2. The following are rated conditions for digital audio equipment which should be specified by the manufacturer: • rated supply voltage; • rated supply frequency; • rated pre-emphasis and de-emphasis characteristics; • rated digital input word length; • rated sampling frequencies. 4 Measuring conditions 4.1 General The measuring conditions applied in this part are the same as those given in IEC 61606-1, together with those given below. 4.2 Environmental conditions As specified in 4.1 of IEC 61606-1. 4.3 Power supply As specified in 4.2 of IEC 61606-1. 4.4 Test signal frequencies As specified in 4.3 of IEC 61606-1. 4.5 Standard setting As specified in 4.4 of IEC 61606-1. SIST EN 61606-2:2010

61606-2 © IEC:2009(E) – 9 – 4.6 Preconditioning As specified in 4.5 of IEC 61606-1. 4.7 Measuring instruments 4.7.1 General All specifications given in IEC 61606-1 are applicable, together with those given below. 4.7.2 Digital level meter The r.m.s. signal level, Vtotal is calculated from the digital data within the in-band frequency range. One method of calculation is as follows: When the frequency components are calculated by the FFT method, the signal level is calculated as follows. All of the frequency components which are within the in-band frequency range are calculated using the following equation: Vtotal = (Vf12 +Vf22 + Vf32 + … Vfn2)1/2 The signal level S in dBFS is calculated from the following equation: S dBFS = 20 log10 (Vtotal /Vfull) where Vfull is the r.m.s. value of the full-scale amplitude of a 1 kHz signal. The number of data points for the FFT calculation is greater than the value of fs. The window used for the measurement shall be the minimum window having the following parameters: W(t) = 1/L [a0 + a1cos(2πt/L) + a2cos(4πt/L) + a3cos(6πt/L)] where L is the number of data points, a0 = 0,363 491 2, a1 = 0,489 268 2, a2 = 0,136 508 8, a3 = 0,010 731 8, and t ≤ L/2. NOTE If the signal level is calculated directly using digital data, it should be filtered to the in-band frequency range before the calculation. 4.7.3 Distortion meter Calculate the ratio of the total signal output to the noise and distortion component. NOTE One measurement method is as follows. SIST EN 61606-2:2010

– 10 – 61606-2 © IEC:2009(E) The r.m.s. signal level, Vtotal is calculated from the resultant in-band frequency components of the fast Fourier Transformation (FFT) of the processed input signal: Vtotal = (Vf12 + Vf22 + Vf32 + … Vfn2)1/2 VN, is obtained by the FFT for frequency ranges from 4 Hz to fL, which is 1/1,5 of the measuring frequency and fH which is 1,5 times the measuring frequency to the upper limit frequency fMAX, VN is derived from the following equation: VN = ((Vf12 + Vf22 + Vf32 + … VfL2) + ( VfH2 + VfH+12 + VfMAX2))1/2 The total distortion D is obtained from the equation: D = VN / Vtotal × 100 % The conditions for the measurement are the same as those for the digital level meter. 4.7.4 Analogue weighting filter The weighing filter used shall have A-weighing characteristics with tolerances ±1 dB as specified for sound level measurements in IEC 61672-1. 4.7.5 Digital weighting filter The characteristics of weighing filter shall comply with A-weighing characteristics with tolerances ±1 dB as specified for sound level measurements in IEC 61672-1. 4.7.6 Digital spectrum analyzer A digital spectrum analyzer computes the Fast Fourier transform (FFT) of the input digital signal. 5 Methods of measurement (digital-in/analogue-out) 5.1 General The methods of measurement described in the following sub-clauses apply to the equipment where the input signal is a digital audio signal and the output signal is an analogue signal. All the specifications described in IEC 61606-1 which correspond to this standard are applied to these subclauses. These subclauses specify the details of measurement methods for consumer use equipment. If the EUT provides two or more channels, all channels should be measured in the same way. The word length and sampling frequency shall be stated in the expression of the results of the measurement. 5.2 Input/output characteristics 5.2.1 Maximum output amplitude 5.2.1.1 Input signal Frequency: 997 Hz Signal level: full-scale level. SIST EN 61606-2:2010

61606-2 © IEC:2009(E) – 11 – 5.2.1.2 Procedures Set the EUT to the standard setting specified in
4.5. Apply the input signal to the EUT. Adjust the level control and measure the maximum output voltage which does not show clipping and has total distortion of less than 1 %. 5.2.2 Gain difference between channels 5.2.2.1 Block diagram of measuring devices Connect the EUT and measuring instrument as in Figure 1.
Figure 1 – Connection diagram of equipment 5.2.2.2 Input signal Frequency: 997 Hz. Signal level: normal measuring level (–20 dBFS). 5.2.2.3 Procedure The following procedure applies. a) Set the EUT to the standard settings specified in
4.5. b) Adjust the gain control (if any) to the maximum position. Apply the same input signal to all channels to be measured, either simultaneously or in turn. c) Measure the output level of each channel. d) The gain difference between the channels is expressed in dB. 5.3 Frequency characteristics 5.3.1 Frequency response 5.3.1.1 Block diagram of measuring devices Connect the EUT and measuring instruments as shown in Figure 2.
Figure 2 – Connection diagram of equipment 5.3.1.2 Input signal The following characteristics apply. Digital signal generator EUT Narrow band-pass filterIn-band level meter IEC
2407/03 Digital signal generator EUT In-band level meter IEC
2408/03 SIST EN 61606-2:2010
– 12 – 61606-2 © IEC:2009(E) a) Reference signal Frequency: 997 Hz. Signal level: normal measuring level (–20 dBFS). b) Test signal Frequency: in the case of the discrete frequency method see IEC 61606-1, Table 1. In the case of the sweep frequency, the frequency range is from 16 Hz to 1/2 × fs which is the same as the comment under the Table 1 of IEC 61606-1. Signal level: normal measuring level (–20 dBFS). 5.3.1.3 Procedure The following procedure applies. a) Set the EUT to the standard settings specified in
4.5. b) Apply a reference signal to the EUT and measure the output signal with the analogue in-band level meter. c) Repeat the same measurement as in b) for the test signals. Calculate the voltage ratio between measurement b) and c) in dB. d) The results are presented in a table or graphically. 5.3.2 Group delay (phase linearity) 5.3.2.1 Block diagram of measuring devices Connect the EUT and measuring instruments as in Figure 3.
Figure 3 – Connection diagram of equipment 5.3.2.2 Input signal The signal generator for group delay measurement (described in IEC 61606-1, 4.6.2.3.2) shall be used. 5.3.2.3 Procedure The following procedure applies. a) Set the EUT to the standard settings specified in
4.5. b) Apply the input signal to the EUT. c) Analyze the output waveform from the EUT using FFT equipment to obtain the phase ΦR (degree) of the 1 kHz signal and calculate the group delay τR from the following equation: τR = (– ΦR/360) × (1/997) d) Repeat analyzing the testing frequency to obtain the phase ΦC and the delay time τC
from the following equation. Digital signal generator EUT Analogue group delay meter IEC
1217/09 SIST EN 61606-2:2010
61606-2 © IEC:2009(E) – 13 – τC = (–ΦC/360) × (1/f) If the phase wraps in excess of 360°, the reading shall be adjusted before computing the above equation.Cƒe) The group delay difference (τRC) and phase linearity (ΦRC) at the measured frequency can be obtained from following equations. τRC = τC – τR ΦRC = τRC × 360 × f 5.4 Noise characteristics 5.4.1 Signal-to-noise ratio 5.4.1.1 Block diagram of measuring devices Connect the EUT and measuring instrument as in Figure 4.
Figure 4 – Connection diagram of equipment 5.4.1.2 Input signal The following characteristics apply. Signal (A):
Signal level = Full-scale level. Frequency = 997 Hz. Signal (B):
Digital zero. 5.4.1.3 Procedure The following procedure applies. a) Set the EUT to the standard settings specified in
4.5. b) Apply the signal (A) to the EUT and note the reading of the meter as A dBFS. c) Apply the signal (B) to the EUT and note the meter reading B dBFS. d) The signal-to-noise ratio SN in dB is obtained from the equation: SN = (A – B).
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