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
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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
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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