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1、INTERNATIONAL STANDARD IS0 7779 First edition AMENDMENT 1 1999-08-01 2003-03-01 Acoustics - Measurement of airborne noise emitted by information technology and telecommunications equipment AMENDMENT 1 : Noise measurement specification for CD/DVD-ROM drives Acoustique - Mesurage du bruit arien mis pa
2、r les quipements lis aux technologies de linformation et aux tlcommunications AMENDEMENT 1: Spcifications relatives au mesurage du bruit pour les lecteurs de CD/DVD-ROM Reference number IS0 7779:1999/Amd.l:2003(E) IS0 2003 IS0 7779:1999/Amd.l:2003(E) PDF disclaimer This PDF file may contain embedded
3、 typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this file, parties accept therein the responsibility of not
4、infringing Adobes licensing policy. The IS0 Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the sofiware products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were
5、 optimized for printing. Every care has been taken to ensure that the file is suitable for use by IS0 member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. O IS02003 All rights reserved. Unless otherwise specifi
6、ed, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either IS0 at the address below or ISOs member body in the country of the requester. IS0 copyright office Case
7、 postale 56 CH-I211 Geneva 20 Tel. + 41 22 749 O 1 11 Fax +41 227490947 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii O IS0 2003 -All rights reserved -,-,- IS0 7779: 1999/Amd.l:2003(E) Foreword IS0 (the International Organization for Standardization) is a worldwide federation o
8、f national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. In
9、ternational organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. IS0 collaborates closely with the International Electrotechnical Commission (i EC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with
10、 the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approva
11、l by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. IS0 shall not be held responsible for identifying any or all such patent rights. Amendment 1 to IS0 7779:1999 was prepared by
12、Technical Committee ISOTC 43, Acoustics, Subcommittee SC 1, Noise. O IS0 2003 -All rights reserved iii -,-,- -,-,- IS0 7779: 1999/Amd.l:2003(E) Acoustics - Measurement of airborne noise emitted by information technology and telecommunications equipment AMENDMENT 1 : Noise measurement specification f
13、or CD/DVD- ROM drives Page 2: Normative references Correct the title of IS0 1 1201 : 1995 as follows: IS0 1 1201 : 1995, Acoustics - Noise emitted by machinery and equipment - Measurement of emission sound pressure levels at a work station and at other specified positions- Engineering method in an e
14、ssentially free field over a reflecting plane Page IO: 6.6.1 In the 2nd paragraph, replace “IS0 3741:1999, Clause 8 by “Annex A of IS0 3741:1999. In the 3rd paragraph, between the parentheses, replace “Clause 8 of IS0 3741:1999 -y “Annex A of IS0 3741:1999. Page 23: 9.1.3 h) Replace “7.7.8 by “7.8.
15、Page 24: 9.2 In Note 1, replace “1 B = IO” by “1 B = 10 dB. Page 30: C. 1 Add the following as the next line after C.18: C.19 CD-ROM and DVD-ROM drives Page 42: C.9.1 Add the following Note: NOTE For CD-ROM and DVD-ROM drives, see C.19. O IS0 2003 -All rights reserved 1 -,-,- IS0 7779:1999/Amd.l:200
16、3(E) Page 42, C.9.2 In the second sentence, replace “shall be tested” by “shall be installed”. Page 49: Figure C.4 At the lower end of arrow which indicates 0,25 m distance, add a symbol for another microphone as for the other four microphone positions. Page 53: C. 18.5 Correct the title as follows:
17、 C.18.5 Calculation of the system A-weighted sound power level and system A-weighted sound pressure level from sub-assembly sound levels In the explanation of symbols after the equation, replace “LpwA,sy; by “LwA,sy;. Page 54: after C. 18.6 Add the following new clauses: C.19 Equipment category: CD-
18、ROM and DVD-ROM drives C.19.1 Description This category covers equipment for reading electronic information from a rotating read-only optical disc (for example, CD-ROM or DVD-ROM) or other optical media operated in a substantially sequential access manner. C.19.2 Installation C.19.2.1 General Instal
19、lation shall be according to 5.1 and 8.5. A drive that forms part of a personal computer or rack-mounted equipment shall be installed according to C.15 or C.18 as appropriate. A drive that is tested as a sub- assembly shall be installed as a sub-assembly according to 5.1.7. C.19.2.2 Media The unbala
20、nce U d of test media, defined in the following equation, shall be 2,5 g-mm k 10 %: U d = md-r where md is the mass of the disc, in grams (9); r is the distance between the centre of gravity and the geometrical centre of the disc, in millimetres (mm). 2 O IS0 2003 -All rights reserved -,-,- IS0 7779
21、: 1999/Amd.l:2003(E) NOTE 1 More detailed and specific information on the disc media is available from reference 8. It is recommended to use a dedicated test media which has the unbalance specified above, since - the measurement of unbalance is not an objective of this International Standard, - test
22、 media satisfying this requirement are commercially available from several sources1 1, and - it is not possible for most users of this International Standard to adjust media to meet the criteria for unbalance, since they can only measure the value. NOTE 2 This media unbalance requirement is based on
23、 several considerations as follows. Clause C.l requires that the operation be “typical of average end use”. Conditions are to be “specified with a view to facilitate the operation of the equipment and to enhance the reliability of the acoustical measurements”. The disc unbalance of 2,5 gmm k 10 % is
24、 specified as “typical of average end use” and is also consistent with reliable acoustical measurements, since this degree of unbalance avoids causing some drives to slow down. Technical details justifying this are contained in reference 9. C.19.3 Operation C.19.3.1 Idle mode Except for short-durati
25、on transients, idle modes are considered non-rotational and inaudible. Therefore measurement of the idle mode is not required. In cases where the drive under test incorporates cooling assemblies for its normal operation, the cooling noise shall be measured as a part of noise of the drive. C.19.3.2 O
26、perating mode C.19.3.2.1 For units having a single drive, the drive shall be operating as specified in C.19.3.2.3. C.19.3.2.2 For units with multiple drives, the number of drives that are simultaneously operable by the host CPU shall be operated as specified in C.19.3.2.3. All other drives shall be
27、in the idle mode, typical of normal use for the system. C.19.3.2.3 Start the sequential read at the inner radius of the disc (or media) such that the disc spins continuously at the fastest speed sustainable with the specified media. Repeat this process until the measurement duration specified in C.
28、19.4 has elapsed. C.19.4 Measurement duration The time-average sound pressure level shall be measured for at least the duration specified in 6.7.2 or 7.7.2. 1) For instance, Almedio, 2-32-13 Sakae-Cho, Higashimurayama, Tokyo, Japan, offers such discs (http:/www.almedio.co.jp). This information is gi
29、ven for the convenience of users of this International Standard and does not constitute an endorsement by IS0 of this product. O IS0 2003 -All rights reserved 3 -,-,- IS0 7779:1999/Amd.l:2003(E) Page 57: Annex D Correct the equation in the 7th line of D.6 as follows: Page 6 1 : Bibliography Add the
30、following references: 8 Recordable Compact Disc Systems, Part 111: CD-RW, Version 2.0. System Description, August, 1998, SONY/PHILIPS 9 KIMIZUKA I. Development of IS0 7779 Amendment 1, “Noise measurement specification for CD/DVD- ROM drives”. Proc. INTER-NOISE 02, N575, Dearborn, MI, 2002 4 O IS0 20
31、03 -All rights reserved -,-,- IS0 7779:1999/Amd.l:2003(E) ICs 17.140.20; 35.020 Price based on 4 pages O IS0 2003 -All rights reserved -,-,- i STDmISO 7779-ENGL 3939 4853903 0792524 723 1111 INTERNATIONAL STANDARD IS0 7779 Second edition 1999-08-01 Acoustics - Measurement of airborne noise emitted b
32、y information technology and telecommunications equipment Acoustique - Mesurage du bruit arien mis par les quipements de technologies de linformation et de tlcommunications This material is reproduced from IS0 documents under International Organization for Standardization (ISO) Copyright License Num
33、ber IHSllCC11996. Not for resale. No pari of these IS0 documents may be reproduced in any form, electronic retrieval system or otherwise, except as allowed in the copyright law of the country of use. or with the prior written consent of I C 0 (Case postale 56, 1211 Geneva 20, Switzerland, Fax +41 22
34、 734 10 79). IHC or the IS0 Licensors members. Reference number IS0 7779: 1999( E) STD-IS0 7779-ENGL 3999 m 4853903 0792525 bbT 111 IS0 7779: 1 999( E) Contents Page 1 Scope 1 2 Normative references 2 3 Terms and definitions . 2 3.1 General definitions . 2 3 . 2 Acoustical definitions 4 4 Requiremen
35、ts . 5 5 Installation and operating conditions 5 5.1 Equipment installation . 5 5.2 Input voltage and frequency 7 5.3 Equipment operation 7 6 Method for determining sound power levels of equipment in reverberation rooms 8 6.1 General . 8 6.2 Measurement uncertainty 8 6.3 Test environment 9 6.4 Instr
36、umentation . 9 6.5 Installation and operation of equipment: General requirements . 10 6.6 Microphone positions and source locations . 10 6.7 Measurement of sound pressure level . 10 6.8 Measurement of the sound pressure level of the reference sound source 11 6.9 Calculation of spaceltime-averaged ba
37、nd sound pressure level . 11 6.1 O Calculation of sound power level 11 o IS0 1999 All rights reserved . Unless otherwise specified. no pari of this publication may be reproduced or utilized in any form or by any means. electronic or mechanical. including photocopying and microfilm. without permissio
38、n in writing from the publisher . International Organization for Standardization Case postale 56 CH-121 1 Genve 20 Switzerland Internet iso3iso.ch Printed in Switzerland -,-,- STD-IS0 7779-ENGL 1999 4853903 O792526 5Tli m IS0 7779:1999(E) o IS0 7 Method for determining sound power levels of equipmen
39、t under essentially free-field conditions over a reflecting plane 13 7.1 General 13 7.2 Measurement uncertainty 13 7.3 Test environment 14 7.4 Instrumentation . 14 7.5 Installation and operation of equipment: General requirements . 15 7.6 Measurement surface and microphone positions . 15 7.7 Measure
40、ment of sound pressure levels . 16 7.8 Calculation of surface sound pressure level and sound power level . 16 8 Method for measuring emission sound pressure levels at defined operator and bystander positions . 17 8.1 General 17 8.2 Measurement uncertainty 17 8.3 Test environment 17 8.4 Instrumentati
41、on . 18 8.5 Installation and operation of equipment 18 8.6 Microphone positions 18 8.7 Measurement of sound pressure levels . 19 8.8 Calculation of the mean emission sound pressure level at the bystander positions . 20 9 Information to be recorded and reported 21 9.1 Information to be recorded 21 9.
42、2 Test report . 24 Annex A (normative) Test accessories . 26 Annex B (normative) Measurement surfaces . 29 Annex C (normative) Installation and operating conditions for specific equipment categories 30 Annex D (informative) Identification of prominent discrete tones . 55 Annex E (informative) Detect
43、ion of impulsive sound pressure levels . 59 Bibliography 61 iii -,-,- STD=ISO 7777-ENGL 3797 4853903 0792527 432 IS0 7779: 1 999( E) o IS0 Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of prepari
44、ng International Standards is normally carried out through IS0 technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in lia
45、ison with ISO, also take part in the work. IS0 collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3. Draft Internation
46、al Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard IS0 7779 was prepared by Technical Committee ISOTTC 43, Acoustics,
47、Subcommittee SC 1, Noise. This second edition o f IS0 7779 cancels and replaces the first edition (IS0 7779:1988), which has been technically revised. Annexes A, B and C form a normative part of this International Standard. Annexes D and E are for information only. iv -,-,- o IS0 STD*ISO 7779-ENGL 1
48、999 W 4851903 0792528 371 IS0 7779:1999(E) Introduction This International Standard specifies methods for the measurement of airborne noise emitted by information technology and telecommunications equipment. Hitherto, a wide variety of methods have been applied by individual manufacturers and users to satisfy particular equipment or application needs. These diverse practices ha