1、 IEC 60728-5Edition 2.0 2007-08INTERNATIONAL STANDARD Cable networks for television signals,sound signals and interactive services Part 5:Headend equipment IEC 60728-5:2007(E)LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.THIS PUBLICA
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9、CENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.IEC 60728-5Edition 2.0 2007-08INTERNATIONAL STANDARD Cable networks for television signals,sound signals and interactive services Part 5:Headend equipment INTERNATIONAL ELECTROTECHNICAL COM
10、MISSION XCICS 33.060.40 PRICE CODEISBN 2-8318-9263-5LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.2 60728-5 IEC:2007(E)CONTENTS FOREWORD.8 INTRODUCTION.10 1 Scope.11 2 Normative references.13 3 Terms,definitions,symbols and abbreviat
11、ions.14 3.1 Terms and definitions.14 3.2 Symbols.19 3.3 Abbreviations.19 4 Methods of measurement.21 4.1 Methods of measurement for digitally modulated signals.21 4.1.1 Introduction.21 4.1.2 Basic assumptions and measurement interfaces.21 4.1.3 Signal level for digitally modulated signals.21 4.2 Sin
12、gle-channel intermodulation specification for channel amplifier and frequency converter.23 4.3 Three-carrier intermodulation measurement.24 4.4 Two carrier intermodulation measurements for second-and third-order products.25 4.4.1 Introduction.25 4.4.2 Intermodulation products with test signals at fr
13、equencies fa and fb.26 4.4.3 Signal levels.26 4.5 Carrier-to-spurious signal ratio at the output.26 4.5.1 Carrier-to-spurious signal ratio at the output of equipment for AM-TV systems.26 4.5.2 Carrier-to-spurious signal ratio at the output of equipment for FM-TV systems.27 4.5.3 Shoulder attenuation
14、.28 4.6 Signal-to-noise measurement.29 4.6.1 Television carrier-to-noise ratio(analogue modulated signals).29 4.6.2 RF signal-to-noise ratio(SD,RF/N)for digitally modulated signals.32 4.7 Differential gain and phase for PAL/SECAM signals.34 4.7.1 Introduction.34 4.7.2 Differential gain(for PAL/SECAM
15、 only).34 4.7.3 Differential phase.35 4.8 Group delay measurements.38 4.8.1 Group delay variation of analogue TV signals.38 4.8.2 Procedure for the measurement of group delay variation on DVB channel converters.39 4.9 Phase noise of an RF carrier.42 4.9.1 Introduction.42 4.9.2 Equipment required.42
16、4.9.3 Connection of the equipment.42 4.9.4 Measurement procedure.43 4.9.5 Presentation of the results.43 4.10 Hum modulation of carrier.44 4.10.1 Definition.44 LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.60728-5 IEC:2007(E)3 4.10.2 Description of the method of measurement.45 4.10.3 Measuring Procedure.46 4.10.4 Calculating the hum modulation ratio.47 4.11 2T-pulse response,K-factor.48 4.12 Chrominance-luminance delay inequaliti