1、BRITISH STANDARD BS 5942-5: 1983 IEC 581-5: 1981 High fidelity audio equipment and systems; minimum performance requirements Part 5: Specification for microphones UDC 621.396 + 681.84-187.4:621.395.61BS5942-5:1983 This British Standard, having been prepared under the directionof the Electronic Equip
2、ment Standards Committee,was published underthe authority of the BoardofBSI and comes intoeffecton 30September1983 BSI 12-1999 The following BSI references relate to the work on this standard: Committee reference EEL/24 Draft for comment 79/32816 DC ISBN 0 580 13429 6 Committees responsible for this
3、 British Standard The preparation of this British Standard was entrusted by the Electronic Equipment Standards Committee (EEL/-) to Technical Committee EEL/24 upon which the following bodies were represented: British Radio and Electronic Equipment Manufacturers Association Department of Health and S
4、ocial Security Department of Industry (National Physical Laboratory) Institution of Electronic and Radio Engineers British Telecom Royal National Institute for the Deaf Society of Hearing Aid Audiologists Limited The following bodies were also represented in the drafting of the standard, through sub
5、committees and panels: Association of British Theatre Technicians Association of Professional Recording Studios Limited Association of Sound and Communications Engineers Limited Audio Engineering Society British Kinematograph, Sound and Television Society Consumers Association Electronic Components
6、Industry Federation European Tape Industry Association Federation of British Audio Independent Television Companies Association Radio Electrical and Television Retailers Association Royal Institute of British Architects Telecommunication Engineering and Manufacturing Association (TEMA) Amendments is
7、sued since publication Amd. No. Date of issue CommentsBS5942-5:1983 BSI 12-1999 i Contents Page Committees responsible Inside front cover National foreword ii 1 Scope 1 2 Object 1 3 Measuring conditions 1 Section 1. Minimum requirements for characteristics directly related to the reproducing quality
8、 4 Frequency response 2 5 Difference between the sensitivities of microphones used for stereophony 3 6 Directional pattern 3 7 Front-to-random sensitivity index (for directional microphones only) 3 8 Overload sound pressure 3 9 Rated equivalent sound pressure level due to inherent noise 3 10 Free-fi
9、eld sensitivity 4 Section 2. Other characteristics and requirements 11 Interconnection 4 12 Characteristics to be specified 4 Figure 1 Omnidirectional microphones 5 Figure 2 Directional microphones 5 Publications referred to Inside back coverBS5942-5:1983 ii BSI 12-1999 National foreword This Part o
10、f BS5942, published under the direction of the Electronic Equipment Standards Committee, is identical with IEC Publication581-5, “High fidelity audio equipment and systems, minimum performance requirements” Part5“Microphones”, published in1981 by the International Electrotechnical Commission (IEC).
11、Terminology and conventions. The text of the International Standard has been approved as suitable for publication as a British Standard without deviation. Some terminology and conventions are not identical with those used in British Standards. IEC 268-11, referred to in clause11, was published in198
12、1. BS5428-5.2:1981 implements the previous edition of IEC268-11:1981 which was published in1973 as IEC268-14A. A revision of BS5428-5.2 implementing IEC268-11:1981 together with its amendments, which are now in preparation, will be published when these amendments have been published. A British Stand
13、ard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references International Standard Corresponding Br
14、itish Standard IEC 268 BS 5428 Methods for specifying and measuring the characteristics of sound system equipment Part 4:1972 Part 3:1977 Microphones (Identical) Part 15:1978 Part 10:1979 Preferred matching values for the interconnection of sound system components (Identical) IEC 581-1:1977 BS 5942
15、High fidelity audio equipment and systems; minimum performance requirements Part 1:1980 Specification for general requirements (Identical) Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages1 to 6, an inside back cover and a back cover. This standard
16、has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS5942-5:1983 BSI 12-1999 1 1 Scope This part applies to microphones, primarily intended for high quality reproducing systems for home use. 2 Object
17、 To lay down the minimum requirements for microphones falling within the scope of this part. 3 Measuring conditions All measurements shall be made in accordance with the general measuring conditions stated in IECPublication581-1, Part1: General, and with the conditions of measurement given in Sectio
18、n1 of IECPublication268-4: Sound System Equipment, Part4: Microphones.BS5942-5:1983 2 BSI 12-1999 Section 1. Minimum requirements for characteristics directly related to the reproducing quality 4 Frequency response Introduction The frequency response requirement is defined in two stages: a type freq
19、uency response is specified and then the permissible deviations of the response of an individual microphone from that type frequency response. This is because the type frequency response may not be intended to be flat, for example a so-called soloists microphone. Clause or sub-clause Characteristic
20、Method of measurement Minimum requirement 4.1 Frequency range According to IEC Publication 268-4, Clause12 From 50 Hz to 12500 Hz 4.2 Type frequency response The type frequency response curve, stated by the manufacturer, which shall be the mean frequency response of microphones of that type, shall f
21、all within the masks for omnidirectional or directional microphones (as appropriate) given inFigure 1 andFigure 2, page5 NOTEIf the claimed frequency range is wider than the minimum requirement of50Hz and12500Hz, the tolerance limits shown on the masks ofFigure 1 andFigure 2 at50Hz and12500Hz still
22、apply for frequencies outside the minimum requirement 4.3 Frequency response of an individual microphone The frequency response curve of any individual microphone shall correspond to the type frequency response curve within the following tolerances: 50 Hz250 Hz 3 dB 250 Hz8 000 Hz 2.5 dB 8000 Hz1250
23、0 Hz 3 dB Over the frequency range250 Hz-8000Hz, the slope of the curve shall not exceed6dB/octave, and for lower and higher frequencies up to the limit frequencies specified for the frequency range it shall not exceed9dB/octave NOTE 1Peaks and troughs in the frequency response curve not exceeding a
24、 frequency range corresponding to1/8 octave shall be neglected with respect to the requirements for maximum admissible slope. NOTE 2If the claimed frequency range is wider than the minimum requirement of 50Hz and12500Hz, the tolerance of 3dB still appliesBS5942-5:1983 BSI 12-1999 3 Clause or sub-cla
25、use Characteristic Method of measurement Minimum requirement 5 Difference between the sensitivities of microphones used for stereophony Sensitivity measurement according to IEC Publication268-4, Sub-clauses10.1 and10.2.1 The sensitivity obtained for stereo microphones or microphones of the same type
26、 intended to be used in stereophonic installations shall be such that the average sensitivities, corresponding to each of the 1/3 octave frequency bands whose central frequencies lie between250Hz and8000Hz inclusive, do not differ by more than3dB from one microphone to the other for the same1/3octav
27、e frequency band 6 Directional pattern According to IEC Publication 268-4, Sub-clause13.1 Omnidirectional microphone The difference between the maximum and minimum values of the expression in IEC Publication268-4 Sub-clause13.1 a) (7) for values of between0 and90 shall not exceed: 2 dB below 1000Hz
28、4 dB between1000Hz and5000Hz 8 dB between5000Hz and8000Hz Directional microphone The off-axis frequency response between250Hz and8000Hz shall not deviate by more than 4dB from the axial response, a transfer to equalize the values obtained at1000Hz being carried out previously Where the response at a
29、ny angle and frequency is more than12dB below the axial response at the same frequency, the deviation of the response at that angle and frequency shall be neglected 7 Front-to-random sensitivity index (for directional microphones only) According to IECPublication 268-4, Sub-clause 13.2 W 3dB within
30、the frequency range250Hz-8000Hz 8 Overload sound pressure According to IECPublication 268-4, Sub-clause14.2 For sound pressure levels up to114dB (ref.204Pa), the total harmonic distortion shall not exceed1% within the frequency range 250Hz8000Hz 9 Rated equivalent sound pressure level due to inheren
31、t noise According to IECPublication268-4, Sub-clause15.1 u 26dB (ref.204Pa) noise A-weightedBS5942-5:1983 4 BSI 12-1999 Section 2. Other characteristics and requirements Clause or sub-clause Characteristic Method of measurement Minimum requirement 10 Free-field sensitivity According to IECPublicatio
32、n268-4, Sub-clauses10.1 and10.2.1 The sensitivities of individual microphones of a predetermined type shall not differ by more than3dB from the rated sensitivity at1000Hz specified by the manufacturer for the relevant type Clause or sub-clause Characteristic Method of measurement Minimum requirement
33、 11 Interconnection a) Mechanical b) Electrical According to IEC Publication268-11 According to IEC Publication268-15 NOTEIn this publication, standard values are given for rated sensitivity, rated impedance and rated load impedance 12 Characteristics to bespecified The characteristics listed in thi
34、s part are mandatory in the manufacturers manual or descriptive leaflet and technical specifications The requirements of Clause20 of IECPublication268-4 should also be observed The manufacturer shall also specify the function of any switches or controls on microphone or associated equipmentBS5942-5:
35、1983 BSI 12-1999 5 Figure 1 Omnidirectional microphones Figure 2 Directional microphones6 blankBS5942-5:1983 BSI 12-1999 Publications referred to See national foreword.BS 5942-5: 1983 IEC 581-5: 1981 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent natio
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