1、BRITISH STANDARD BS EN 62121:2001 Methods of measurement for minidisc recorders/players The European Standard EN 62121:2001 has the status of a British Standard ICS 33.160.30 BS EN 62121:2001 This British Standard, having been prepared under the direction of the Electrotechnical Sector Policy and St
2、rategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 30 September 2002 BSI 30 September 2002 ISBN 0 580 40469 2 National foreword This British Standard is the official English language version of EN 62121:2001. It is identical with IEC 62121:2001. The
3、 UK participation in its preparation was entrusted to Technical Committee EPL/100, Audio, video and multimedia systems, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which imp
4、lement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication d
5、oes not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/Europ
6、ean committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pag
7、es 2 to 43 and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEAN STANDARD EN 62121 NORME EUROPENNE EUROPISCHE NORM December 2001 CENELEC European Committee for Electrotechnic
8、al Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2001 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 62
9、121:2001 E ICS 33.160.30 English version Methods of measurement for minidisc recorders/players (IEC 62121:2001) Mthodes de mesure des appareils de lecture et denregistrement pour les minidisques (CEI 62121:2001) Messverfahren fr MiniDisc- Recorder/Wiedergabegerte (IEC 62121:2001) This European Stand
10、ard was approved by CENELEC on 2001-12-01. 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 concerni
11、ng 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
12、 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, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, No
13、rway, Portugal, Spain, Sweden, Switzerland and United Kingdom.Foreword The text of document 100B/392/FDIS, future edition 1 of IEC 62121:2001, 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 6
14、2121 on 2001-12-01. 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) 2002-09-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2
15、004-12-01 Annexes designated “normative“ are part of the body of the standard. Annexes designated “informative“ are given for information only. In this standard, annexes A and ZA are normative and annexes B and C are informative. Annex ZA has been added by CENELEC. _ Endorsement notice The text of t
16、he International Standard IEC 62121:2001 was approved by CENELEC as a European Standard without any modification. _ Page2 EN62121:200162121 IEC:0201 3 CONTENTS 1 Scope and object5 2 Normative references .5 3 Terms and definitions .6 4 Information required from manufacturers of MD recorders 7 4.1 Int
17、roduction .7 4.2 Identification8 4.3 Mechanical characteristics 8 4.4 Electrical characteristics8 4.5 Environmental conditions 8 4.6 Mechanical performance requirements 9 4.7 Electrical performance requirements .9 4.8 Results of measurement9 5 Measuring conditions9 5.1 Introduction .9 5.2 Environmen
18、tal conditions 10 5.3 Power supply.10 5.4 Input conditions.10 5.5 Output condition10 5.6 MD recorder setting.11 5.7 Other conditions11 5.8 Test disc .11 5.9 Performance claims.12 5.10 Measuring equipment 12 5.11 Additional considerations.14 6 Measurement of mechanical parameters 14 6.1 Shock and vib
19、ration resistance14 6.2 Acoustic noise.17 7 Measurement of electrical parameters 18 7.1 Maximum power consumption18 7.2 Frequency response18 7.3 Signal to noise ratio.19 7.4 Dynamic range 21 7.5 Distortion and noise 21 7.6 Channel separation .22 7.7 Deviation of emphasis characteristic .23 7.8 Modul
20、ation distortion .25 7.9 Phase difference between channels 26 7.10 Minimum input level.27 7.11 Output voltage.27 7.12 Pitch deviation.28 7.13 Access times.29 7.14 Trackability30 Page3 EN62121:200162121 IEC:0201 4 Annex A (normative) Test disc requirements32 Annex B (informative) Table of measurement
21、s Results .39 Annex C (informative) Available test disc .41 Annex ZA (normative) Normative references to international publications with their corresponding European publications .42 Figure A.1 Sweep signal 38 Table 1 Acceleration and duration of pulse 15 Table A.1 Recording signals of the test disc
22、.34 Table A.2 Composition of the recording signals38 Table B.1 Table of measurements Results 39 Page4 EN62121:200162121 IEC:0201 5 METHODS OF MEASUREMENT FOR MINIDISC RECORDERS/PLAYERS 1 Scope and object This International Standard specifies the measuring methods for recording and reproducing equipm
23、ent for MiniDiscs that conform to the specifications of IEC 61909. NOTE 1 For convenience, this recording and reproducing equipment will be referred to as “MD recorder” hereinafter. The reproducing part of this equipment or equipment with only a reproducing function will be referred to as “MD player
24、” throughout the text of this standard. If there is no risk of misunderstanding, the term “MD recorder” will be generally used. NOTE 2 This standard does not include specifications for listening tests (see IEC 60268-13). The object of this standard is to list and define the characteristics affecting
25、 the performance of MiniDisc recorders or players, to establish conditions and methods of measurement of those characteristics, and to standardize the presentation of the results. 2 Normative references The following normative documents contain provisions which, through reference in this text, const
26、itute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent edit
27、ions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of IEC and ISO maintain registers of currently valid International Standards. IEC 60065:1998, Audio,video and similar electronic apparatus Safety require
28、ments IEC 60068-2-27:1987, Environmental testing Part 2: Test Test Ea and guidance: Shock IEC/TR 60268-13:1998, Sound system equipment Part 13: Listening tests on loudspeakers IEC 60651:1979, Sound level meters IEC 60721-3-5:1997, Classification of environmental conditions Part 3: Classification of
29、groups of environmental parameters and their services, Section 5: Ground vehicle installations IEC 60958:1989, Digital audio interface IEC 61606:1997, Audio and audiovisual equipment Digital audio parts Basic methods of measurement of audio characteristics IEC 61909:2000, Audio recording MiniDisc Sy
30、stem. ISO 532:1975, Acoustics Methods for calculating loudness levels Page5 EN62121:200162121 IEC:0201 6 ISO 1996 (all parts), Acoustics Description and measurement of environmental noise ISO 3740:1980, Acoustics Determination of sound power levels of noise sources Guidelines for the use of basic st
31、andards and for the preparation of noise test codes ISO 3741:1999, Acoustics Determination of sound power levels of noise sources Precision methods for broad band sources in reverberation rooms ISO 3743-1:1994, Acoustics Determination of sound power levels of noise sources Engineering methods for sm
32、all, movable sources in reverberation fields Part 1: Comparison method for hard walled test rooms ISO 3743-2:1994, Acoustics Determination of sound power levels of noise sources using sound pressure Engineering methods for small, movable sources in reverberant fields Part 2: Methods for special reve
33、rberation test rooms ISO 3744:1994, Acoustics Determination of sound power levels of noise sources using sound pressure Engineering method in an essentially free field over a reflecting plane. ISO 3745:1977, Acoustics Determination of sound power levels of noise sources Precision methods for anechoi
34、c and semi anechoic rooms 3 Terms and definitions For the purpose of this International Standard, the terms and definitions given in the relevant clauses pertaining to measurement (see clauses 6 and 7) and the following definitions apply. 3.1 meaning of the expression “designated xxxxx” the item or
35、value that is designated by a manufacturer based on the reference item or value EXAMPLE: Designated recording level: This is the recording level designated by a manufacturer based on the reference recording level which is indicated on an attached level meter 3.2 reference frequency the value is 1 kH
36、z 3.3 reference recording level the reference for measurements and corresponds to the average music level It is equal to 12 dB of the full scale signal level of the MiniDisc (= 0,5 V) Page6 EN62121:200162121 IEC:0201 7 3.4 maximum recording level this level is specified as the maximum in the test di
37、sc. It is equal to the full scale signal level of the MiniDisc (= 2,0 V) 3.5 reference source impedance the impedance designated as the source impedance for the input terminal. An equivalent resistor should terminate the input terminal as the source impedance during the measurements 3.6 reference in
38、put level the input level of the reference frequency signal at the input terminal to attain the reference recording level at a designated attenuation of the recording volume control 3.7 reference load impedance the impedance designated as the load impedance for the output terminal. An equivalent res
39、istor should terminate the output terminal as the load impedance during the measurements 3.8 reference output level the output level at the output terminal that is terminated by the designated load impedance during the reproduction of the reference recording level signal 3.9 full-scale output level
40、the output level at the output terminal, terminated by a designated load impedance, during the reproduction of the maximum recording level signal of the test disc. It corresponds to +12 dB of the reference or designated output level 3.10 minimum input level the level of the reference frequency signa
41、l at the input terminal to obtain the designated recording level at the maximum level position of the recording volume control 4 Information required from manufacturers of MD recorders 4.1 Introduction This information falls into two distinct categories: a) mandatory information that shall be clearl
42、y shown on the MD recorder. The requirements are indicated by the letter “A” on the right-hand side of the page; b) optional information which may be given separately, for example, in an instruction manual relating to and supplied with the MD recorder. It is essential that mandatory information outs
43、ide the scope of this standard be given in the correct location as specified in other relevant standards (for example, for aspects of safety, see IEC 60065). Page7 EN62121:200162121 IEC:0201 8 4.2 Identification 4.2.1 Name of manufacturer and/or trade mark A 4.2.2 Model or type and serial number (va
44、riants, if any, to be stated) A 4.3 Mechanical characteristics 4.3.1 Dimensions (inclusive of knobs, connectors and plugs at front and rear sides) Height mm Width mm Depth mm 4.3.2 Total mass kg or g 4.3.3 Special facilities Operating positions horizontal, vertical or other System single, multi disc
45、 player or recorder, combination player or recorder, car portable Remote control Programming 4.4 Electrical characteristics 4.4.1 Power supply Volts (V) A 4.4.2 Power frequency Hertz (Hz) A 4.4.3 Power consumption Volt-amperes (VA) for a.c. or W for d.c. A 4.4.4 Output facilities (digital, analogue,
46、 optical or others) 4.5 Environmental conditions 4.5.1 Temperature range C 4.5.2 Relative humidity 4.5.3 Air pressure kPa Page8 EN62121:200162121 IEC:0201 9 4.6 Mechanical performance requirements Units For methods of measurement, see subclauses: Tolerable shock level m/s 2 6.1 Tolerable acceleratio
47、n level m/s 2 6.1 Maximum acoustic noise dB(A), sones or NR 6.2 4.7 Electrical performance requirements Units For methods of measurement, see subclauses: Maximum power consumption VA for a.c. or W for d.c. 7.1 Frequency response dB 7.2 Signal to noise ratio dB 7.3 Dynamic range dB 7.4 Distortion and
48、 noise % 7.5 Channel separation dB 7.6 Emphasis deviation dB 7.7 Modulation distortion % 7.8 Phase difference between channels 7.9 Minimum input level V 7.10 Output voltage V 7.11 Pitch deviation % 7.12 Access time s 7.13 Trackability mm 7.14 4.8 Results of measurement The results shall be reported
49、with reference to this standard. An example is shown in Table B.1. 5 Measuring conditions 5.1 Introduction To conveniently specify how MD recorders are to be set up for measurement or verification, it is necessary to define certain conditions under which the measurements shall be made. Furthermore, these conditions shall be related to specific test
