1、 IEC 61606-2 Edition 2.0 2009-07 INTERNATIONAL STANDARD Audio and audiovisual equipment Digital audio parts Basic measurement methods of audio characteristics Part 2: Consumer use IEC 61606-2:2009(E) THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2009 IEC, Geneva, Switzerland All rights reserved.
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9、D Audio and audiovisual equipment Digital audio parts Basic measurement methods of audio characteristics Part 2: Consumer use INTERNATIONAL ELECTROTECHNICAL COMMISSION W ICS 33.160.01 PRICE CODE ISBN 2-8318-1051-7 Registered trademark of the International Electrotechnical Commission 2 61606-2 IEC:20
10、09(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 measurement8 3.4 Rated values .8 4 Measuring conditions8 4.1 General .8 4.2 Environmental con
11、ditions 8 4.3 Power supply.8 4.4 Test signal frequencies .8 4.5 Standard setting8 4.6 Preconditioning .9 4.7 Measuring instruments 9 4.7.1 General .9 4.7.2 Digital level meter9 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 analy
12、zer 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 amplitude10 5.2.2 Gain difference between channels.11 5.3 Frequency characteristics11 5.3.1 Frequency response11 5.3.2 Group delay (phase linearity).12 5.4 Noise ch
13、aracteristics .13 5.4.1 Signal-to-noise ratio 13 5.4.2 Dynamic range 13 5.4.3 Out-of-band noise ratio14 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 Intermodulation17 6 Methods of measurement (analogue-in/digital-ou
14、t) .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 characteristics23 61606-2 IEC:2009(E) 3 6.3.1 Frequency response23 6.3.2 Gr
15、oup 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 noise28 6.4.4 Cross-talk29 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 Intermodulat
16、ion35 Figure 1 Connection diagram of equipment11 Figure 2 Connection diagram of equipment11 Figure 3 Connection diagram of equipment12 Figure 4 Connection diagram of equipment13 Figure 5 Connection diagram of equipment14 Figure 6 Connection diagram of equipment14 Figure 7 Connection diagram of equip
17、ment15 Figure 8 Connection diagram of equipment16 Figure 9 Connection diagram of equipment17 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 diagra
18、m 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 Co
19、nnection 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
20、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 4 61606-2 IEC:2009(E) Figure 33 Connection diagram of equipment 34 Figur
21、e 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 DIGI
22、TAL 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
23、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
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26、s 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 sen
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29、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 in
30、cluding 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 re
31、liance 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
32、 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
33、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 refe
34、rence number; some inappropriate descriptions have been improved. 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 votin
35、g 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 websi
36、te. 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 spec
37、ific 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 AUD
38、IO 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.
39、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 und
40、ated 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
41、 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 audiovi
42、sual 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 analog
43、ue 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
44、 equipment, the amplitude is 2 V r.m.s. 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 k 3.1.3 normal measuring level analogue signal level equal to 20 dB of analogue full-scale amplitude 3.1.4 normal s
45、ource impedance value defined in IEC 61938, or in the case of general purpose audio for consumer equipment, 2,2 k 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
46、 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-emp
47、hasis 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
48、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. 61606-2 IEC:2009(E) 9 4.6 Preconditioning As specified in 4.5 of IEC 61606-1. 4.7 Measuring instruments
49、 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, V totalis 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 cal
