1、 IEC 61260-1 Edition 1.0 2014-02 INTERNATIONAL STANDARD NORME INTERNATIONALE Electroacoustics Octave-band and fractional-octave-band filters Part 1: Specifications lectroacoustique Filtres de bande doctave et de bande dune fraction doctave Partie 1: Spcifications IEC 61260-1:2014-02(EN-FR) THIS PUBL
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19、irez nous donner des commentaires sur cette publication ou si vous avez des questions contactez-nous: csciec.ch. IEC 61260-1 Edition 1.0 2014-02 INTERNATIONAL STANDARD NORME INTERNATIONALE Electroacoustics Octave-band and fractional-octave-band filters Part 1: Specifications lectroacoustique Filtres
20、 de bande doctave et de bande dune fraction doctave Partie 1: Spcifications INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE X ICS 17.140.50 PRICE CODE CODE PRIX ISBN 978-2-8322-1417-6 Registered trademark of the International Electrotechnical Commission Marque dp
21、ose de la Commission Electrotechnique Internationale Warning! Make sure that you obtained this publication from an authorized distributor. Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agr. 2 61260-1 IEC:2014 CONTENTS FOREWORD . 4 INTRODUCTION . 6 1 Scop
22、e 7 2 Normative references. 7 3 Terms and definitions 8 4 Reference environmental conditions . 12 5 Performance requirements . 12 5.1 General 12 5.2 Octave frequency ratio . 13 5.3 Reference frequency 13 5.4 Exact mid-band frequencies . 13 5.5 Nominal mid-band frequencies 13 5.6 Band-edge frequencie
23、s . 14 5.7 Time-averaged signal levels . 14 5.8 Filter attenuation 14 5.9 Reference attenuation 15 5.10 Relative attenuation . 15 5.11 Normalized effective bandwidth 18 5.12 Effective bandwidth deviation . 19 5.13 Linear operating range . 19 5.14 Time-invariant operation . 20 5.15 Anti-alias filters
24、 20 5.16 Summation of output signals . 21 5.17 Overload indicator 21 5.18 Filter decay time. 21 5.19 Maximum input signal . 21 5.20 Output terminals and terminating impedances . 22 5.21 Power supply check . 22 5.22 Sensitivity to various environments . 22 General . 22 5.22.1Ambient air temperature a
25、nd relative humidity 22 5.22.2 5.23 Electrostatic-discharge and electromagnetic-compatibility requirements 22 General . 22 5.23.1Electrostatic discharges . 23 5.23.2Immunity to power-frequency and radio-frequency fields 23 5.23.3Emission limits 25 5.23.4 6 Instrument marking 25 7 Instruction manual
26、. 26 7.1 General 26 7.2 Operation . 26 7.3 Testing . 27 Annex A (informative) Relationship between tolerance interval, corresponding acceptance interval and the maximum-permitted uncertainty of measurement 28 Annex B (normative) Maximum-permitted expanded uncertainties of measurement . 29 Annex C (i
27、nformative) Examples of conformance assessment to specifications of this standard . 30 61260-1 IEC:2014 3 C.1 General 30 C.2 Conformance criteria 30 C.3 Example test results . 31 Annex D (informative) Base 2 filters . 33 Annex E (normative) Nominal mid-band frequencies . 34 E.1 Mid-band frequencies
28、for octave-band and one-third-octave-band filters 34 E.2 Mid-band frequencies for one-half-octave-band filters . 34 E.3 Mid-band frequencies for other bandwidths . 34 Annex F (informative) Normalized frequencies at breakpoints of acceptance limits on minimum and maximum relative attenuation for one-
29、third-octave-band filters 36 Annex G (informative) Filter response to exponentially swept sinusoidal signals 38 G.1 Exponential frequency sweep . 38 G.2 Response of set of band-pass filters to a sweep 38 Annex H (informative) Measurement of filter decay time 41 H.1 General 41 H.2 Measurement of filt
30、er decay time 41 H.2.1 Instruments with the capability to measure reverberation time 41 H.2.2 Instruments without the capability to measure reverberation time 41 Bibliography . 43 Figure 1 Minimum and maximum limits on relative attenuation as a function of f/f mfor class 1 and class 2 octave-band fi
31、lters . 17 Figure A.1 Relationship between tolerance interval, corresponding acceptance interval and the maximum-permitted uncertainty of measurement . 28 Figure C.1 Examples of conformance assessment 32 Figure G.1 Relation between the logarithmic frequency scale and the linear time scale due to the
32、 exponential sweep . 40 Table 1 Acceptance limits on relative attenuation for octave-band filters . 15 Table 2 Limits for radiated disturbance of class B Information Technology Equipment (ITE) at a distance of 10 m 25 Table 3 Limits for conducted disturbance to the voltage of a public supply of elec
33、tric power . 25 Table B.1 Maximum-permitted expanded uncertainties of measurement 29 Table C.1 Examples of conformance assessment . 31 Table E.1 Mid-band frequencies for octave-band and one-third-octave-band filters in the audio range 35 Table F.1 Acceptance limits on relative attenuation for one-th
34、ird-octave-band filters 37 4 61260-1 IEC:2014 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ ELECTROACOUSTICS OCTAVE-BAND AND FRACTIONAL-OCTAVE-BAND FILTERS Part 1: Specifications FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
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44、e 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 elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsib
45、le for identifying any or all such patent rights. International Standard IEC 61260-1 has been prepared by IEC technical committee 29: Electroacoustics. This first edition of IEC 61260-1, future IEC 61260-2 and future IEC 61260-3, cancel and replace the first edition of IEC 61260 published in 1995, a
46、nd Amendment 1:2001. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the IEC 61260: a) the single document in the first edition of IEC 61260:1995 is in IEC 61260 series separated into the three parts covering: specifica
47、tions, pattern evaluation tests and periodic tests; b) the IEC 61260:1995 specified three performance categories: classes 0, 1 and 2. The IEC 61260 series specifies requirements for class 1 and 2; c) in the IEC 61260:1995, the design goals for the specification can be based on base-2 or base 10 desi
48、gn. In IEC 61260 series only base-10 is specified; 61260-1 IEC:2014 5 d) the reference environmental conditions have been changed from 20 C / 65 % RH to 23 C / 50 % RH; e) IEC 61260:1995 specified tolerance limits without considering the uncertainty of measurement for verification of the specificati
49、ons. IEC 61260 series specifies acceptance limits for the observed values and maximum-permitted uncertainty of measurements for laboratories testing conformance to specifications in the standard. The text of this standard is based on the following documents: FDIS Report on voting 29/835/FDIS 29/839/RVD Full information on the voting for the approval of this standard can be found in the report on voting indicated in th
