1、 INTERNATIONAL STANDARD IEC61606-4 First edition2005-12 Audio and audiovisual equipment Digital audio parts Basic measurement methods of audio characteristics Part 4:Personal computer Reference number IEC 61606-4:2005(E)LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONL
2、Y,SUPPLIED BY BOOK SUPPLY BUREAU.Publication numbering As from 1 January 1997 all IEC publications are issued with a designation in the 60000 series.For example,IEC 34-1 is now referred to as IEC 60034-1.Consolidated editions The IEC is now publishing consolidated versions of its publications.For ex
3、ample,edition numbers 1.0,1.1 and 1.2 refer,respectively,to the base publication,the base publication incorporating amendment 1 and the base publication incorporating amendments 1 and 2.Further information on IEC publications The technical content of IEC publications is kept under constant review by
4、 the IEC,thus ensuring that the content reflects current technology.Information relating to this publication,including its validity,is available in the IEC Catalogue of publications(see below)in addition to new editions,amendments and corrigenda.Information on the subjects under consideration and wo
5、rk in progress undertaken by the technical committee which has prepared this publication,as well as the list of publications issued,is also available from the following:IEC Web Site(www.iec.ch)Catalogue of IEC publications The on-line catalogue on the IEC web site(www.iec.ch/searchpub)enables you to
6、 search by a variety of criteria including text searches,technical committees and date of publication.On-line information is also available on recently issued publications,withdrawn and replaced publications,as well as corrigenda.IEC Just Published This summary of recently issued publications(www.ie
7、c.ch/online_news/justpub)is also available by email.Please contact the Customer Service Centre(see below)for further information.Customer Service Centre If you have any questions regarding this publication or need further assistance,please contact the Customer Service Centre:Email:custserviec.ch Tel
8、:+41 22 919 02 11 Fax:+41 22 919 03 00 LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.INTERNATIONAL STANDARD IEC61606-4 First edition2005-12 Audio and audiovisual equipment Digital audio parts Basic measurement methods of audio charac
9、teristics Part 4:Personal computer IEC 2005 Copyright-all rights reserved 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 the publisher.International Electrotechnica
10、l Commission,3,rue de Varemb,PO Box 131,CH-1211 Geneva 20,SwitzerlandTelephone:+41 22 919 02 11 Telefax:+41 22 919 03 00 E-mail:inmailiec.ch Web:www.iec.ch V For price,see current cataloguePRICE CODE Commission Electrotechnique InternationaleInternational Electrotechnical Commission LICENSED TO MECO
11、N Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.2 61606-4 IEC:2005(E)CONTENTS FOREWORD.4 1 Scope.6 2 Normative references.6 3 Terms,definitions and abbreviated terms.6 3.1 Terms and definitions.6 3.2 Abbreviated terms.8 3.3 Rated values.8 4 Measuring
12、conditions.8 4.1 Environmental conditions.8 4.2 Power supplies.8 4.3 Test signal frequencies.9 4.4 Standard setting.10 4.5 Working setting.11 4.6 Preconditioning.12 5 Measuring instruments.12 5.1 Analogue signal generator.12 5.2 Analogue in-band level meter.12 5.3 Analogue low-pass filter.12 5.4 Ana
13、logue weighting filter.12 5.5 Standard medium.12 5.6 Recording medium.13 5.7 Software for digital data evaluation.13 5.8 Short-term distortion meter.14 5.9 Other instruments.14 6 Methods of measurement(digital-in/analogue-out).14 6.1 Input/output characteristics.15 6.2 Frequency response.16 6.3 Nois
14、e characteristics.17 6.4 Distortion characteristics.21 7 Methods of measurement(analogue-in/digital-out).23 7.1 Input/output characteristics.23 7.2 Frequency response.25 7.3 Noise characteristics.26 7.4 Distortion characteristics.29 Figure 1 Block diagram for maximum output amplitude measurement.15
15、Figure 2 Block diagram for gain difference between channels measurement.16 Figure 3 Block diagram for frequency-response measurement.16 Figure 4 Block diagram for signal-to-noise ratio measurement.17 Figure 5 Block diagram for dynamic range measurement.18 Figure 6 Block diagram for channel separatio
16、n measurement.20 Figure 7 Block diagram for distortion and noise measurement.21 Figure 8 Block diagram for short-term distortion measurement.22 Figure 9 Block diagram for maximum allowable input amplitude measurement.23 LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.61606-4 IEC:2005(E)3 Figure 10 Block diagram for gain difference between channel and tracking error measurement.24 Figure 11 Block diagram for frequency response measu
