1、 IEC 60461Edition 4.0 2010-03INTERNATIONAL STANDARD Time and control code IEC 60461:2010(E)LICENSED TO MECON LIMITED-RANCHI/BANGALORE,FOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2010 IEC,Geneva,Switzerland All rights reserve
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9、LIED BY BOOK SUPPLY BUREAU.IEC 60461Edition 4.0 2010-03INTERNATIONAL STANDARD Time and control code INTERNATIONAL ELECTROTECHNICAL COMMISSION XICS 33.160.40;33.170 PRICE CODEISBN 2-8318-1086-1 Registered trademark of the International Electrotechnical Commission LICENSED TO MECON LIMITED-RANCHI/BANG
10、ALORE,FOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.2 60461 IEC:2010(E)CONTENTS FOREWORD.6 INTRODUCTION.8 1 Scope.9 2 Normative references.9 3 Terms,definitions and reserved.9 3.1 Terms and definitions.9 3.2 Reserved.11 4 Time representation in 30 frames per second and 60 fra
11、mes per second systems.11 4.1 Definitions of real time and NTSC time.11 4.1.1 Definition of real time.11 4.1.2 Definition of NTSC time.11 4.2 Time address of a frame.11 4.2.1 Definition of time address of a frame.11 4.2.2 Non-drop frame Uncompensated mode.12 4.2.3 Drop frame NTSC time compensated mo
12、de.12 4.3 Colour frame identification in NTSC analogue composite television systems.12 5 Time representation in 25 frames per second and 50 frames per second systems.12 5.1 Definition of real time.12 5.2 Time address of a frame.12 5.3 Colour frame identification in PAL analogue composite television
13、systems.13 5.3.1 Colour frame identification.13 5.3.2 Logical relationship.13 5.3.3 Arithmetic relationship.13 6 Time representation in 24-frame systems.13 6.1 Definitions of real time and NTSC time.13 6.1.1 Definition of real time.13 6.1.2 Definition of NTSC time.14 6.2 Time address of a frame.14 7
14、 Structure of the time address and control bits.14 7.1 Numeric code.14 7.2 Time address.14 7.3 Flag bits.14 7.3.1 Definition of flag bits.14 7.3.2 Drop frame flag(NTSC composite television system only).14 7.3.3 Colour frame flag(NTSC and PAL composite television systems only).14 7.3.4 Binary group f
15、lags.15 7.3.5 Modulation method specific flag.15 7.4 Use of the binary groups.15 7.4.1 Binary group flag assignments.15 7.4.2 Character set not specified and unspecified clock time(BGF2=0,BGF1=0,BGF0=0).15 7.4.3 Eight-bit character set and unspecified clock time(BGF2=0,BGF1=0,BGF0=1).15 7.4.4 Date/t
16、ime zone and unspecified clock time(BGF2=1,BGF1=0,BGF0=0).16 7.4.5 Page/line multiplex system and unspecified clock time(BGF2=1,BGF1=0,BGF0=1).16 LICENSED TO MECON LIMITED-RANCHI/BANGALORE,FOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.60461 IEC:2010(E)3 7.4.6 Clock time specified and unspecified character set(BGF2=0,BGF1=1,BGF0=0).16 7.4.7 Unassigned binary group usage and unassigned clock time(BGF2=0,BGF1=1,BGF0=1).16 7.4.8 Date/time zone and clock time(BGF2=1,BGF1=1,BGF
