1、 IEC 60728-1-2 Edition 2.0 2014-03 INTERNATIONAL STANDARD NORME INTERNATIONALE Cable networks for television signals, sound signals and interactive services Part 1-2: Performance requirements for signals delivered at the system outlet in operation Rseaux de distribution par cbles pour signaux de tlv
2、ision, signaux de radiodiffusion sonore et services interactifs Partie 1-2: Exigences de performance relatives aux signaux dlivrs la prise terminale en fonctionnement IEC 60728-1-2:2014-03(en-fr) THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2014 IEC, Geneva, Switzerland All rights reserved. Unl
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20、-nous: csciec.ch. IEC 60728-1-2 Edition 2.0 2014-03 INTERNATIONAL STANDARD NORME INTERNATIONALE Cable networks for television signals, sound signals and interactive services Part 1-2: Performance requirements for signals delivered at the system outlet in operation Rseaux de distribution par cbles po
21、ur signaux de tlvision, signaux de radiodiffusion sonore et services interactifs Partie 1-2: Exigences de performance relatives aux signaux dlivrs la prise terminale en fonctionnement INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE W ICS 33.120.10; 33.160; 35.110
22、 PRICE CODE CODE PRIX ISBN 978-2-8322-1436-7 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale Warning! Make sure that you obtained this publication from an authorized distributor. Attention! Veuillez vous assurer que
23、vous avez obtenu cette publication via un distributeur agr. 2 IEC 60728-1-2:2014 IEC 2014 CONTENTS FOREWORD . 4 INTRODUCTION . 6 1 Scope 9 2 Normative references 9 3 Terms, definitions, symbols and abbreviations . 10 3.1 Terms and definitions . 10 3.2 Abbreviations . 17 4 Methods of measurement 18 5
24、 Subjective quality of television pictures in relation to the main impairments of the analogue composite television signal . 19 5.1 Subjective quality scale 19 5.2 Subjective quality and objective parameters . 20 6 Summation of the impairments 23 6.1 Impairments to be summed 23 6.2 Summation laws .
25、23 General 23 6.2.1Voltage addition 23 6.2.2Power addition 24 6.2.3 6.3 Examples . 24 7 Performance requirements in operation . 24 7.1 General 24 7.2 Impedance . 25 7.3 Performance requirements at the terminal input . 25 Definition 25 7.3.1Signal level . 25 7.3.2Other parameters . 25 7.3.3 7.4 Perfo
26、rmance requirements at system outlets 25 Minimum and maximum carrier levels . 25 7.4.1Mutual isolation between system outlets . 26 7.4.2Isolation between individual outlets in one household . 26 7.4.3Isolation between forward and return path 26 7.4.4Long-term frequency stability of distributed carri
27、er signals at 7.4.5 any system outlet 26 Carrier level differences at system outlet 26 7.4.6Frequency response within a television channel . 26 7.4.7Random noise at system outlet . 26 7.4.8Interference to television channels 29 7.4.9 Annex A (normative) RF carrier to noise ratio 31 A.1 AM-VSB modula
28、ted signals 31 A.1.1 General 31 A.1.2 Definition 31 A.1.3 TV receiver IF filtering process . 31 A.1.4 Equivalent noise bandwidth 31 A.1.5 AM demodulation process . 32 A.2 FM modulated signals 33 IEC 60728-1-2:2014 IEC 2014 3 Annex B (informative) Examples of summation of impairments. 34 B.1 Voltage
29、addition . 34 B.2 Power addition . 34 Bibliography 36 Figure 1 CATV/MATV/SMATV cable network Performance requirements 7 Figure 2 Examples of location of HNI for various home network types 14 Figure 3 Signal to echo ratio (dB) versus echo delay ( s) 22 Figure A.1 Example of a TV receiver IF filter (s
30、ystems B and G) 31 Figure A.2 Example of a demodulated TV signal (systems B and G) 32 Table 1 Methods of measurement of IEC 60728-1 applicable in operation 19 Table 2 Impairment units versus subjective quality . 20 Table 3 Impairment grade versus un-weighted white noise 21 Table 4 Impairment grade v
31、ersus differential gain 21 Table 5 Impairment grade versus differential phase . 21 Table 6 Impairment grade versus short time linear distortion (2T pulse) . 21 Table 7 Impairment grade versus chrominance-luminance gain inequality 21 Table 8 Impairment grade versus chrominance-luminance delay inequal
32、ity 22 Table 9 Impairment grade versus echo rating (1 s echo delay) . 22 Table 10 Correction factors to be applied for delays different from 1 s . 22 Table 11 Carrier-to-noise ratios at system outlet (analogue television) in operation 27 Table 12 RF signal-to-noise ratios at system outlet (digital t
33、elevision) in operation . 27 Table 13 Carrier-to-noise ratios at system outlet (sound radio) in operation . 29 Table B.1 Examples of voltage addition . 34 Table B.2 Examples of power addition . 35 4 IEC 60728-1-2:2014 IEC 2014 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ CABLE NETWORKS FOR TELEVISION
34、 SIGNALS, SOUND SIGNALS AND INTERACTIVE SERVICES Part 1-2: Performance requirements for signals delivered at the system outlet in operation FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committ
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45、tent rights. International Standard IEC 60728-1-2 has been prepared by technical area 5: Cable networks for television signals, sound signals and interactive services, of IEC technical committee 100: Audio, video and multimedia systems and equipment. This second edition cancels and replaces the firs
46、t edition published in 2009, and constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: update of performance requirements in Clause 7 to include those for DVB-T2 signals. This International Standard is to be used in
47、conjunction with IEC 60728-1:2014. IEC 60728-1-2:2014 IEC 2014 5 The text of this standard is based on the following documents: FDIS Report on voting 100/2246/FDIS 100/2282/RVD Full information on the voting for the approval of this standard can be found in the report on voting indicated in the abov
48、e table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. A list of all parts of the IEC 60728 series, published under the general title Cable networks for television signals, sound signals and interactive services, can be found on the IEC website. The committee h
49、as decided that the contents of this publication will remain unchanged until the stability date indicated on the IEC web site under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. 6 IEC 60728-1-2:2014 IEC 2014 INTRODUCTION Standards and deliverables of the
