1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationAudio and audiovisual equipment Digital audio parts Basic measurementmethods of audio characteristics Part 2: Consumer useBS EN 61606-2:2009National forewordThis British Standard
2、 is the UK implementation of EN 61606-2:2009. It isidentical to IEC 61606-2:2009. It supersedes BS EN 61606-2:2004 which iswithdrawn.The UK participation in its preparation was entrusted to Technical CommitteeEPL/100, Audio, video and multimedia systems and equipment.A list of organizations represen
3、ted on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisions of acontract. Users are responsible for its correct application. BSI 2010ISBN 978 0 580 60899 5ICS 33.160.01Compliance with a British Standard cannot confer immu
4、nity fromlegal obligations.This British Standard was published under the authority of the StandardsPolicy and Strategy Committee on 31 January 2010Amendments issued since publicationAmd. No. Date Text affectedBRITISH STANDARDBS EN 61606-2:2009EUROPEAN STANDARD EN 61606-2 NORME EUROPENNE EUROPISCHE N
5、ORM November 2009 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: Avenue Marnix 17, B - 1000 Brussels 2009 CENELEC - All rights of exploitation in any form and by any
6、 means reserved worldwide for CENELEC members. Ref. No. EN 61606-2:2009 E ICS 33.160.01 Supersedes EN 61606-2:2004English 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
7、audiovisuels - Parties audionumriques - Mthodes fondamentales pour la mesure des caractristiques audio - Partie 2: Utilisation par le consommateur (CEI 61606-2:2009) Audio- und audiovisuelle Gerte - Digitale Tonteile - Grundlegende Messverfahren der Audio-Eigenschaften - Teil 2: Allgemeingebrauch (I
8、EC 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
9、 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 respons
10、ibility 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,
11、Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 61606-2:2009EN 61606-2:2009 - 2 - Foreword The text of document 100/1548/FDIS, future editi
12、on 2 of IEC 61606-2, 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 61606-2 on 2009-09-01. This European Standard supersedes EN 61606-2:2004. The significant technical changes with respect to
13、 EN 61606-2:2004 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. This Part 2 is to be used in conjunction with EN 61606-1, General. The following dates w
14、ere 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) 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 CENE
15、LEC. _ Endorsement notice The text of the International Standard IEC 61606-2:2009 was approved by CENELEC as a European Standard without any modification. _ BS EN 61606-2:2009- 3 - EN 61606-2:2009 Annex ZA (normative) Normative references to international publications with their corresponding Europe
16、an 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 public
17、ation 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 S219932)IEC 60958 Series Digital audio interface EN 60958 Se
18、ries 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 equipmen
19、t - 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
20、of issue. BS EN 61606-2:2009 2 61606-2 IEC:2009(E) CONTENTS 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.
21、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 meter9 4.7.3 Distortion meter.9 4.7.4 Analogue weighting filter .10 4.7.5 Digital weighting fil
22、ter 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 characteristics11 5.3.1 Frequency response 11 5.3.2 Group d
23、elay (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 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
24、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 characteristics23 BS EN 61606-2:20096
25、1606-2 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 noise28 6.4.4 Cross-talk29 6.4.5 Channel separation .31 6.5 Distortion characteristics .33 6.5.1 Level non-line
26、arity .33 6.5.2 Distortion and noise.34 6.5.3 Intermodulation35 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 Connect
27、ion 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 Figur
28、e 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 equ
29、ipment 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
30、 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 BS EN
31、 61606-2:2009 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 BS EN 61606-2:20
32、0961606-2 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 audiov
33、isual 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 indis
34、pensable 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 meth
35、ods 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 equipm
36、ent 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 o
37、f 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 analogu
38、e 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. BS EN 61606-2:2009 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 eq
39、uipment, 22 k 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 k 3.2 Explanation of terms “jitter” See 3.2 of IEC 61606-1. 3
40、.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 dig
41、ital 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 th
42、is 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
43、 in 4.4 of IEC 61606-1. BS EN 61606-2:200961606-2 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,
44、Vtotalis 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 ran
45、ge are calculated using the following equation: Vtotal= (Vf12+Vf22+ Vf32+ Vfn2)1/2The signal level S in dBFSis calculated from the following equation: S dBFS= 20 log10(Vtotal/Vfull) where Vfullis the r.m.s. value of the full-scale amplitude of a 1 kHz signal. The number of data points for the FFT ca
46、lculation 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(2t/L) + a2cos(4t/L) + a3cos(6t/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,
47、 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
48、follows. BS EN 61606-2:2009 10 61606-2 IEC:2009(E) The r.m.s. signal level, Vtotalis calculated from the resultant in-band frequency components of the fast Fourier Transformation (FFT) of the processed input signal: Vtotal= (Vf12+ Vf22+ Vf32+ Vfn2)1/2VN, is obtained by the FFT for frequency ranges f
49、rom 4 Hz to fL, which is 1/1,5 of the measuring frequency and fHwhich is 1,5 times the measuring frequency to the upper limit frequency fMAX, VNis derived from the following equation: VN= (Vf12+ Vf22+ Vf32+ VfL2) + ( VfH2+ VfH+12+ VfMAX2)1/2The total distortion D is obtained from the equation: D = VN/ Vtotal 100 % The conditions for the measurement are the
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