1、 IEC 61606-1 Edition 2.0 2009-07 INTERNATIONAL STANDARD Audio and audiovisual equipment Digital audio parts Basic measurement methods of audio characteristics Part 1: General IEC 61606-1:2009(E) THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2009 IEC, Geneva, Switzerland All rights reserved. Unle
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9、io and audiovisual equipment Digital audio parts Basic measurement methods of audio characteristics Part 1: General INTERNATIONAL ELECTROTECHNICAL COMMISSION U ICS 33.160.01 PRICE CODE ISBN 2-8318-1051-6 Registered trademark of the International Electrotechnical Commission 2 61606-1 IEC:2009(E) CONT
10、ENTS FOREWORD.4 1 Scope.6 2 Normative references .6 3 Terms, definitions, explanations and rated values 7 3.1 Terms and definitions 7 3.2 Explanation of term “jitter” .9 3.3 Rated values .9 4 Measuring conditions10 4.1 Environmental conditions 10 4.2 Power supply.10 4.2.1 Supply voltage.10 4.2.2 Fre
11、quency(ies) 10 4.2.3 High-frequency and harmonic components (or ripples) in the power supply output.10 4.3 Test signal frequencies .10 4.4 Standard setting11 4.4.1 Standard input conditions for the EUT .11 4.4.2 Standard output conditions for the EUT .12 4.4.3 Standard setting of controls.12 4.5 Pre
12、conditioning .12 4.6 Measuring instruments 13 4.6.1 General .13 4.6.2 Signal generator13 4.6.3 Filter15 4.6.4 Level meter .16 4.6.5 Distortion meter.17 4.6.6 Frequency meter .18 4.6.7 Group delay meter.18 4.6.8 Analogue spectrum analyzer19 4.6.9 Digital waveform monitor .19 4.6.10 Voltage amplifier
13、.19 4.6.11 Standard digital player.20 5 Methods of measurement (digital-in/analogue-out) .20 5.1 General .20 5.2 Input/output characteristics .20 5.2.1 Maximum output amplitude20 5.2.2 Gain difference between channels and tracking error 20 5.3 Frequency characteristics21 5.3.1 Frequency response21 5
14、.3.2 Group delay (phase linearity).21 5.4 Noise characteristics .21 5.4.1 Signal-to-noise ratio (idle channel noise).21 5.4.2 Dynamic range 22 5.4.3 Out-of-band noise ratio22 5.4.4 Channel separation .22 5.5 Distortion characteristics .23 61606-1 IEC:2009(E) 3 5.5.1 Level non-linearity .23 5.5.2 Dis
15、tortion and noise.23 5.5.3 Intermodulation23 6 Methods of measurement (analogue-in/digital-out) .23 6.1 General .23 6.2 Input/output characteristics .23 6.2.1 Analogue to digital level calibration .23 6.2.2 Maximum allowable input amplitude.24 6.2.3 Gain difference between channel and tracking error
16、 24 6.3 Frequency characteristics24 6.3.1 Frequency response24 6.3.2 Group delay.25 6.4 Noise characteristics .25 6.4.1 Signal-to-noise ratio (idle channel noise).25 6.4.2 Dynamic range 25 6.4.3 Folded noise26 6.4.4 Cross-talk26 6.4.5 Channel separation .26 6.5 Distortion characteristics .26 6.5.1 L
17、evel non-linearity .26 6.5.2 Distortion and noise.27 6.5.3 Intermodulation27 Bibliography28 Figure 1 Analogue test signal waveform.14 Figure 2 Digital test signal waveform .14 Table 1 Actual frequencies used in the measurement 11 Table 2 Impulse conditions and measuring range.19 4 61606-1 IEC:2009(E
18、) INTERNATIONAL ELECTROTECHNICAL COMMISSION _ AUDIO AND AUDIOVISUAL EQUIPMENT DIGITAL AUDIO PARTS BASIC MEASUREMENT METHODS OF AUDIO CHARACTERISTICS Part 1: General FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national
19、 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 Sp
20、ecifications, 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. Inter
21、national, 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 fo
22、rmal 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
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24、 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 sh
25、all 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 lia
26、bility 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 (inc
27、luding 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 o
28、f 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 61606-1 has been prepared by IEC technical c
29、ommittee 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 preconditio
30、ning; add A weighting filter in measuring instruments; correct the wrong reference number; some inappropriate descriptions have been improved. 61606-1 IEC:2009(E) 5 The text of this standard is based on the following documents: FDIS Report on voting 100/1547/FDIS 100/1581/RVD Full information on the
31、 voting for the approval of this standard can be found in the report on voting indicated in the above table. 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 th
32、e 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
33、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. 6 61606-1 IEC:2009(E) AUDIO AND AUDIOVISUAL EQUIPMENT DIGITAL AUDIO PARTS BASIC MEASUREMENT MET
34、HODS OF AUDIO CHARACTERISTICS Part 1: General 1 Scope This part of IEC 61606 is applicable to the basic methods of measurement of the audio characteristics of the digital audio part of audio and audiovisual equipment for all of consumer use, professional use and personal computer. The common measuri
35、ng conditions and methods, described in this standard, are used for the measurement of the performance characteristics of equipment having an audio bandwidth equal to approximately one-half of the sampling frequency of a system, where the audio information is processed in the form of digital data. C
36、D players, DAT recorders, digital amplifiers, digital sound broadcast receivers and television broadcast receivers with digital sound are examples. This standard describes test methods for equipment which has digital input with analogue output and analogue input with digital output. Future revisions
37、 of this standard will cover digital-in/digital-out and analogue-in/analogue-out tests. This standard does not apply to a lossy compression signal and also does not apply to power amplifiers. NOTE 1 A digital audio system having an analogue input and an analogue output with digital signal processing
38、 may have different characteristics from those of a pure analogue audio system due to sampling of the audio signal and performance of incorporated A/D and D/A converters. Measurement methods described in IEC 60268-3 may not give correct results when applied to a digital system. NOTE 2 The methods de
39、scribed are mostly based on sampling frequencies of 32 kHz and higher. NOTE 3 For tests of those systems of digital-in digital-out, and analogue-in analogue-out tests, refer to AES17. NOTE 4 This standard is planned to harmonize with the first edition of IEC 61606 (1997) 1 , AES17 and EIAJ CP- 2i50.
40、 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 60038, IEC standard v
41、oltages IEC 60107-5, Recommended methods of measurement on receivers for television broadcast transmissions Part 5: Electrical measurements on multichannel sound television receivers using the NICAM two-channel digital sound system 1IEC 61606:1997, Audio and audiovisual equipment Digital audio parts
42、 Basic methods of measurement of audio characteristics (this publication has been replaced by the IEC 61606 series) 61606-1 IEC:2009(E) 7 IEC 60268-2, Sound system equipment Part 2: Explanation of general terms and calculation methods IEC 60268-3, Sound system equipment Part 3: Amplifiers IEC 60958
43、(all parts), Digital audio interface IEC 61606-2, Audio and audiovisual equipment Digital audio parts Basic measurement methods of audio characteristics Part 1: Consumer use IEC 61606-3, Audio and audiovisual equipment Digital audio parts Basic measurement methods of audio characteristics Part 3: Pr
44、ofessional use IEC 61606-4, Audio and audiovisual equipment Digital audio parts Basic measurement methods of audio characteristics Part 4: Personal computer IEC 61079-4, Methods of measurement on receivers for satellite broadcast transmissions in the 12 GHz band Part 4: Electrical measurements on so
45、und/data decoder units for the digital subcarrier NTSC system IEC 61079-5, Methods of measurement on receivers for satellite broadcast transmissions in the 12 GHz band Part 5: Electrical measurements on decoder units for MAC/packet systems IEC 61672-1, Electroacoustics Sound level meters Part 1: Spe
46、cifications IEC 61883-6, Consumer audio/video equipment Digital interface Part 6: Audio and music data transmission protocol ITU-R BS 468-4, Measurement of audio-frequency noise voltage level in sound broadcasting AES17, AES standard method for digital audio engineering Measurement of digital audio
47、equipment 3 Terms, definitions, explanations and rated values 3.1 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1.1 aliasing components output frequency components below the folding frequency made from the input signal above the folding frequen
48、cy 3.1.2 analogue full-scale amplitude nominal signal level at the analogue input of an EUT corresponding to the digital full-scale level 3.1.3 coding format series of data bit stream with control information in accordance with the standard for which the EUT is designed, such as IEC 60958, IEC 61883
49、-6 or some kind of AV interface NOTE A coding word is arranged as a 2s complimentary binary form in this standard. 8 61606-1 IEC:2009(E) 3.1.4 digital audio signal series of digital signals expressed by sampled data NOTE This data is constructed with LPCM (Linear Pulse Code Modulation) data. 3.1.5 digital interface for measurement type of input or output digital interface which is used for measurement, such a
