1、 Errata to ANSI S1.11-2004 American National Standard Specification for Octave-Band and Fractional-Octave-Band Analog and Digital Filters Page 4 contains text that is not related to the definition above it (3.32). Delete the text at the bottom of the right-hand column beginning with the word “accord
2、ing“ and ending with the word “instrument.“ Page 9 Three words were omitted from sub clause 4.14.2. The omitted words are underlined below. The clause should read: 4.14.2 Relative humidity. The manufacturer shall state the range of relative humidity and corresponding air temperature over which the i
3、nstrument can operate continuously. After a 24 hour exposure to the humid atmosphere at a relative humidity of 75%, and at an ambient air temperature of +40 oC and without condensation on internal components of the instrument under test, the relative attenuation at the nominal midband frequency for
4、any filter available in the instrument shall not deviate from the relative attenuation at the same frequency under reference environmental conditions by more than 0.15 dB, 0.3 dB, and 0.5 dB for class 0, 1, and 2 instruments, respectively. Acoustical Society of America OFFICE OF THE STANDARDS SECRET
5、ARIAT Susan Blaeser Standards Manager 35 Pinelawn Road, Suite 114 E, Melville, NY 11747 Telephone (631) 390-0215 Fax (631) 390-0217 E-mail asastdsaip.org Copyright Acoustical Society of America Provided by IHS under license with ASA Not for ResaleNo reproduction or networking permitted without licen
6、se from IHS-,-,-ANSI S1.11-2004 AMERICAN NATIONAL STANDARD SPECIFICATION FOR OCTAVE-BAND AND FRACTIONAL-OCTAVE-BAND ANALOG AND DIGITAL FILTERS Accredited Standards Committee S1, Acoustics Standards Secretariat Acoustical Society of America 35 Pinelawn Road, Suite 114E Melville, NY 11747-3177 Copyrig
7、ht Acoustical Society of America Provided by IHS under license with ASA Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-The American National Standards Institute, Inc. (ANSI) is the national coordinator of voluntary standards development and the clearinghouse in th
8、e U.S.A. for information on national and international standards. The Acoustical Society of America (ASA) is an organization of scientists and engineers formed in 1929 to increase and diffuse the knowledge of acoustics and to promote its practical applications. Copyright Acoustical Society of Americ
9、a Provided by IHS under license with ASA Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-ANSI S1.11-2004 AMERICAN NATIONAL STANDARD Specification for Octave-Band and Fractional-Octave-Band Analog and Digital Filters Secretariat Acoustical Society of America Approve
10、d 19 February 2004 American National Standards Institute, Inc. Abstract This standard provides performance requirements for analog, sampled-data, and digital implementations of bandpass filters that comprise a filter set or spectrum analyzer for acoustical measurements. It supersedes ANSI S1.11-1986
11、 (R1998) American National Standard Specification for Octave-Band and Fractional-Octave-Band Analog and Digital Filters, and is a counterpart to International Standard IEC 61260:1995 Elec-troacoustics Octave-Band and Fractional-Octave-Band Filters. Significant changes from ANSI S1.11-1986 have been
12、adopted in order to conform to most of the specifications of IEC 61260:1995. This standard dif-fers from IEC 61260:1995 in three ways: (1) the test methods of IEC 61260 clauses 5 is moved to an infor-mative annex, (2) the term “band number,” not present in IEC 61260, is used as in ANSI S1.11-1986, (
13、3) references to American National Standards are incorporated, and (4) minor editorial and style differences are incorporated. Copyright Acoustical Society of America Provided by IHS under license with ASA Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-AMERICAN NA
14、TIONAL STANDARDS ON ACOUSTICS The Acoustical Society of America (ASA) provides the Secretariat for Accredited Standards Committees S1 on Acoustics, S2 on Mechanical Vibration and Shock, S3 on Bioacoustics, and S12 on Noise. These committees have wide representation from the technical community (manu
15、facturers, consumers, trade associations, general interest, and government representatives). The standards are published by the Acoustical Society of America as American National Standards after approval by their respective Standards Committees and the American National Standards Institute. These st
16、andards are developed and published as a public service to provide standards useful to the public, industry, and consumers, and to Federal, State, and local governments. Each of the accredited Standards Committees operating in accordance with procedures approved by American National Standards Instit
17、ute (ANSI) is responsible for developing, voting upon, and maintaining or revising its own Standards. The ASA Standards Secretariat administers Committee organization and activity and provides liaison between the Accredited Standards Committees and ANSI. After the Standards have been produced and ad
18、opted by the Accredited Standards Committees, and approved as American National Standards by ANSI, the ASA Standards Secretariat arranges for their publication and distribution. An American National Standard implies a consensus of those substantially concerned with its scope and provisions. Consensu
19、s is established when, in the judgment of the ANSI Board of Standards Review, substantial agreement has been reached by directly and materially affected interests. Substantial agreement means much more than a simple majority, but not necessarily unanimity. Consensus requires that all views and objec
20、tions be considered and that a concerted effort be made towards their resolution. The use of an American National Standard is completely voluntary. Their existence does not in any respect preclude anyone, whether he or she has approved the Standards or not, from manufacturing, marketing, purchasing,
21、 or using products, processes, or procedures not conforming to the Standards. NOTICE: This American National Standard may be revised or withdrawn at any time. The procedures of the American National Standards Institute require that action be taken periodically to reaffirm, revise, or withdraw this S
22、tandard. Acoustical Society of America ASA Secretariat 35 Pinelawn Road, Suite 114E Melville, New York 11747-3177 Telephone: 1 (631) 390-0215 Fax: 1 (631) 390-0217 E-mail: asastdsaip.org 2004 by Acoustical Society of America. This standard may not be reproduced in whole or in part in any form for sa
23、le, promotion, or any commercial purpose, or any purpose not falling within the provisions of the Copyright Act of 1976, without prior written permission of the publisher. For permission, address a request to the Standards Secretariat of the Acoustical Society of America.Copyright Acoustical Society
24、 of America Provided by IHS under license with ASA Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-i Contents Page Foreword ii 1 Scope 1 2 Normative references . 1 3 Definitions 2 4 Performance requirements . 5 5 Performance verification. 10 6 Instrument marking .
25、10 7 Instruction manual. 10 Tables 1 Limits on relative attenuation for octave-band filters . 8 A1. Midband frequencies for one-third-octave-band and octave-band filters in the audio range 13 B1. Limits on relative attenuation for one-third-octave-band filters. . 15 C1. Verification recommendations
26、16 Figures 1 Illustration of minimum and maximum limits on relative attenuation for class 0, 1, and 2 octave-band filters . 9 Annexes A Midband frequencies . 12 B Normalized frequencies at breakpoints of limits on minimum and maximum relative attenuation for one-third-octave-band filters 14 C Recomm
27、endations for verification of the electrical performance characteristics of bandpass filters. 16 D Test methods . 17 Copyright Acoustical Society of America Provided by IHS under license with ASA Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-ii Foreword This fore
28、word is for information only and is not an integral part of ANSI S1.11-2004 American National Standard Specification for Octave-Band and Fractional-Octave-Band Analog and Digital Filters. This standard replaces ANSI S1.11-1986, and is the American National Standard counterpart of International Stand
29、ard IEC 61260:1995, Electroacoustics Octave-band and fractional-octave-band filters including Amendment 1:2001. The technical requirements in this American National Standard are similar to those in IEC 61260. This standard contains four informative annexes. This standard was developed under the juri
30、sdiction of Accredited Standards Committee S1, Acoustics, which has the following scope: Standards, specifications, methods of measurement and test, and terminology, in the fields of physical acous-tics, including architectural acoustics, electroacoustics, sonics and ultrasonics, and underwater soun
31、d, but ex-cluding those aspects which pertain to safety, human tolerance, and comfort. At the time this standard was submitted to Accredited Standards Committee S1, Acoustics, for final ap-proval, the membership was as follows: G.S.K. Wong, Chairman T.F.W. Embleton, Interim Vice Chairman S. B. Blaes
32、er, Secretary Acoustical Society of America G.S.K. Wong T.J. Kuemmel (Alt.) Air-Conditioning and Refrigeration Institute . R. Seel M. Darbeau (Alt.) American Industrial Hygiene Association D. Driscoll D. Sandfort (Alt.) Audio Engineering Society, Inc. . D. Queen M.R. Chial (Alt.) Bruel broadband and
33、 discrete frequency; and long and short durations. For applications involving transient signals, different realizations of filters meeting the requirements of this standard may give different results. 2 Normative references The following normative documents contain provi-sions which, through referen
34、ce in this text, consti-tute provisions of this standard. At the time of pub-lication, the editions indicated were valid. All nor-mative documents are subject to revision, and par-ties to agreements based on this standard are en-couraged to investigate the possibility of applying the most recent edi
35、tions of the normative docu-ments indicated below. 2.1 American National Standards ANSI S1.1-1994 (R1999), American National Stan-dard Acoustical Terminology. ANSI S1.4-1983 (R2001), American National Stan-dard Specification for Sound Level Meters with Amendment ANSI S1.4A-1985 (R2001). ANSI S1.6-19
36、84 (R2001), American National Stan-dard Preferred Frequencies, Frequency Levels, and Band Numbers for Acoustical Measurements. ANSI S1.14-1988 (R2003), American National Stan-dard Recommendations for Specifying and Testing the Susceptibility of Acoustical Instruments to Radio-Frequency Electromagnet
37、ic Fields, 25 MHz to 1 GHz. ANSI S1.43-1997 (R2002), American National Stan-dard Specifications for Integrating-Averaging Sound Level Meters. 2.2 International Standards IEC 60050(801):1994, International Electrotechnical Vocabulary Chapter 801: Acoustics and elec-troacoustics. ISO Publication, Inte
38、rnational vocabulary of basic and general terms in metrology, ISBN 92-67-01075-1, 1993. NOTE The above reference is specified for compatibility with IEC 61260. Copyright Acoustical Society of America Provided by IHS under license with ASA Not for ResaleNo reproduction or networking permitted without
39、 license from IHS-,-,-ANSI S1.11-2004 2 3 Definitions For the purpose of this standard, the definitions contained in IEC 61000-4-2, IEC 61000-4-3, IEC 61000-6-1, IEC 61000-6-2 and CISPR 61000-6-3 as well as the following definitions apply. NOTE For definitions of additional terms in this standard, r
40、eference should be made to ANSI S1.1, IEC 60050(801), and the OIML Vocabulary of Legal Metrology. 3.1 bandpass filter. Filter with a single trans-mission band (or passband with small relative at-tenuation) extending from a lower bandedge fre-quency greater than zero to a finite upper bandedge freque
41、ncy. 3.2 octave ratio. Nominal frequency ratio of 2:1; general symbol G. Two options, designated base-ten and base-two, for determining an octave-band, or fractional-octave-band, frequency ratio are permit-ted. The base-ten system is preferred. For base-ten systems, G10 = 10 3/10 (1) For base-two sy
42、stems, G2 = 2 (2) 3.3 bandwidth designator. Reciprocal of a positive integer, including 1, to designate the frac-tion of an octave band; symbol 1/b. 3.4 reference frequency. Frequency of 1000 Hz, exactly; symbol fr . 3.5 exact midband frequency. In hertz, a fre-quency that has a specified relationsh
43、ip to the ref-erence frequency such that the ratio of the exact midband frequencies of any two contiguous band-pass filters is the same for all filters in a filter set of a specified bandwidth; symbol fm . When the de-nominator of the bandwidth designator is an odd number, exact midband frequencies
44、of any filter in a set of filters are determined from fm = (G (x30)/b )( fr ) b odd (3) and when the denominator of the bandwidth desig-nator is an even number, exact midband frequen-cies of any filter in a set of filters are determined from fm = (G (2x59)/(2b) )( fr ) b even (4) where x is any inte
45、ger, positive, negative, or zero. NOTES 1 Exact midband frequencies determined from equation (3) or (4) permit the output of narrow-fractional-octave-band filters to be combined to yield the band level of a filter of wider-bandwidth with a corresponding exact midband frequency and corre-sponding ban
46、dedge frequencies. 2 With the base-ten system, midband frequencies included within any 10:1 frequency range are the same as within any other 10:1 frequency range ex-cept for the position of the decimal sign. With the base-two system, midband frequencies are unique and do not repeat. 3 As examples, f
47、or one-third-octave-band filters, the exact midband frequency for the band with a nominal midband frequency of 5000 Hz is, to three decimal places, 5,011.872 Hz by the base-ten sys-tem and 5,039.684 Hz by the base-two system, or a difference of approximately 0.6%. At a nominal mid-band frequency of
48、50,000 Hz, the exact midband fre-quency is, to three decimal places, 50,118.723 Hz by the base-ten system and 50,796.834 Hz by the base-two system, or an approximate difference of 1.4%. 4 When the denominator of the bandwidth desig-nator is an odd number, one of the filters in a com-plete filter set
49、 may have a midband frequency of 1000 Hz. When the denominator of the bandwidth designator is an even number, the bandedge fre-quency of one adjacent pair of filters in a complete filter set may be at 1000 Hz and therefore none of the filters will have a midband frequency of 1000 Hz. 5 Exact midband frequencies for octave-band and one-third-octave
