EN 60461:2011

Time and control code

IEC 60461:2010(E) specifies a digital time and control code for use in television, film, and accompanying audio systems operating at nominal rate of 60, 59, 94, 50, 30, 29, 97, 25, 24 and 23,98 frames per second. This International Standard specifies a time address, binary groups, and flag bit structure. In addition, the standard specifies a binary group flag assignment, a linear time code transport, and a vertical interval time code transport. It cancels and replaces the third edition published in 2001, of which it constitutes a technical revision. It includes the following significant change with regard to the previsous edition: The time code for progressive television systems with a frame rate greater than 30 frames per second is added.

Zeit- und Steuercode

Code temporel et de pilotage

La IEC 60461 :2010 spécifie un code temporel et de commande numérique destiné aux systèmes de télévision, films et systèmes audio annexes, fonctionnant à des fréquences image nominales de 60, 59,94, 50, 30, 29,97, 25, 24 et 23,98 images par seconde. La présente Norme internationale spécifie une structure d'adresse temporelle, de groupes binaires et de bits drapeaux. Cette norme spécifie en outre une affectation des drapeaux des groupes binaires, un transport linéaire du code temporel et un transport du code temporel dans l'intervalle vertical. Cette quatrième édition annule et remplace la troisième édition parue en 2001, dont elle constitue une révision technique. Par rapport à l'édition précédente elle comporte la modification significative suivante: est ajouté le code temporel pour des systèmes de télévision à balayage progressif de fréquence image supérieure à 30 images par seconde. La présente version bilingue (2012-02) correspond à la version anglaise monolingue publiée en 2010-03.

Časovni in krmilni kod (IEC 60461:2010)

Ta mednarodni standard določa digitalni čas in krmilno kodo za uporabo v televiziji, filmu in spremnih avdiosistemih, ki delujejo pri nominalni vrednosti 60, 59,94, 30, 29,97, 25, 24 in 23,98 okvirov na sekundo. Ta mednarodni standard določa časovne naslove, binarne skupine in strukturo signalnega bita. Poleg tega ta standard določa dodelitev signala binarne skupine, prenos linearne časovne kode in prenos vertikalne intervalne časovne kode.
Ta mednarodni standard določa primarne strukture za prenos podatkov za linearno časovno kodo (LTC) in vertikalno intervalno časovno kodo (VITC). Ta standard določa modulacijo LTC in časovno razporeditev za vse videoformate. Ta standard prav tako določa modulacijo VITC in lokacijo samo za 525/59,94 in 625/50 analogne kompozitne in komponentne sisteme.
OPOMBA: Digitalna predstavitev analogne VITC (D-VITC) je določena v SMPTE 266M in je opredeljena samo za digitalne komponentne sisteme 525/59,94 in 625/50. Formati visoke definicije in tisti, dokumentirani v SMPTE 274M in SMPTE 296, morajo uporabljati pomožno časovno kodo (ATC), kot je opredeljena v SMPTE 12M-2 (prej SMPTE RP 188) za prenos časovne kode v digitalnem videopodatkovnem toku. Za nadaljnje implementacije časovne kode za standardne definicije digitalnih formatov se spodbuja uporaba ATC pred uporabo D-VITC.

General Information

• Status: Published
• Publication Date: 17-Mar-2011
• Withdrawal Date: 01-Jan-2014
• ICS: 33.160.40 - Video systems
• ICS: 33.170 - Television and radio broadcasting
• Technical Committee: CLC/TC 100X - Audio, video and multimedia systems and equipment and related sub-systems
• Drafting Committee: IEC/TC 100 - IEC_TC_100
• Parallel Committee: IEC/TC 100 - IEC_TC_100
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 18-Mar-2011
• Completion Date: 18-Mar-2011
• Ref Project: SIST EN 60461:2011 - Time and control code (IEC 60461:2010)

Relations

• Replaces: EN 60461:2001 - Time and control code for video tape recorders
• Effective Date: 28-Jan-2023

Standards Content (Sample)

SLOVENSKI STANDARD
01-julij-2011
1DGRPHãþD
SIST EN 60461:2005
ýDVRYQLLQNUPLOQLNRG,(&
Time and control code (IEC 60461:2010)
Zeit- und Steuercode (IEC 60461:2010)
Code temporel et de pilotage (CEI 60461:2010)
Ta slovenski standard je istoveten z: EN 60461:2011
ICS:
33.160.40 Video sistemi Video systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 60461
NORME EUROPÉENNE
March 2011
EUROPÄISCHE NORM
ICS 33.160.40; 33.170 Supersedes EN 60461:2001

English version
Time and control code
(IEC 60461:2010)
Code temporel et de pilotage Zeit- und Steuercode
(CEI 60461:2010) (IEC 60461:2010)

This European Standard was approved by CENELEC on 2011-01-02. CENELEC members are bound to comply
with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard
the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and notified
to the Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus,
the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,
Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia,
Spain, Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Management Centre: Avenue Marnix 17, B - 1000 Brussels

© 2011 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60461:2011 E
Foreword
The text of document 100/1515/CDV, future edition 4 of IEC 60461 prepared by Technical Area 6,
Professional electronics storage media, data structures and equipment, of IEC TC 100, Audio, video and
multimedia systems and equipment, was submitted to the IEC-CENELEC parallel vote and was approved
by CENELEC as EN 60461 on 2011-01-02.
This European Standard supersedes EN 60461:2001.
for progressive television systems with a frame rate greater than 30 frames per second is added.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN and CENELEC shall not be held responsible for identifying any or all such patent
rights.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
(dop) 2011-10-02
national standard or by endorsement
– latest date by which the national standards conflicting
(dow) 2014-01-02
with the EN have to be withdrawn
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 60461:2010 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following note has to be added for the standard indicated:
IEC 61169-8:2007 NOTE  Harmonized as EN 61169-8:2007 (not modified).
__________
- 3 - EN 60461:2011
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.

NOTE  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Publication Year Title EN/HD Year

ISO/IEC 646 1991 Information technology - ISO 7-bit coded - -
character set for information interchange

ISO/IEC 2022 1994 Information technology - Character code - -
structure and extension techniques

ITU-R BT.1700 2005 Characteristics of composite video signals for - -
conventional analogue television systems

SMPTE 170M 2004 Television - Composite Analog Video Signal - - -
NTSC for Studio Applications
SMPTE 258M 1993 Television - Transfer of Edit Decision Lists - -

SMPTE 262M 1995 Television, Audio and Film - Binary Groups of - -
Time and Control Codes - Storage and
Transmission of Data
SMPTE 309M 1999 Television - Transmission of Date and Time - -
Zone Information in Binary Groups of Time
and Control Code
IEC 60461 ®
Edition 4.0 2010-03
INTERNATIONAL
STANDARD
Time and control code
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
X
ICS 33.160.40; 33.170 ISBN 978-2-88910-197-9
– 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 frames 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 mode.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 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 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 flags.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/time 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

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, BGF0=0) .16
7.4.9 Specified clock time and page/line multiplex system (BGF2=1,
BGF1=1, BGF0=1) .16
7.5 Clock time reference – Binary group flag combinations.16
8 Linear time code application.17
8.1 Code word format .17
8.2 Code word data content .17
8.2.1 LTC code word content .17
8.2.2 Time address.17
8.2.3 Flag bits .17
8.2.4 Binary groups .18
8.2.5 Synchronization word .18
8.2.6 Biphase mark polarity correction .19
8.3 Modulation method .19
8.4 Bit rate .20
8.5 Timing of the code word relative to a television signal .20
8.6 Linear time code interface electrical and mechanical characteristics.21
8.6.1 Measurements .21
8.6.2 Rise/fall time.21
8.6.3 Amplitude distortion .21
8.6.4 Timing of the transitions.21
8.6.5 Interface connector .21
8.6.6 Output impedance.21
8.6.7 Output amplitude .21
9 Vertical interval application – Analogue television systems .26
9.1 Code word format .26
9.2 Code word data content .26
9.2.1 VITC code word content.26
9.2.2 Time address.29
9.2.3 Flag bits .29
9.2.4 Binary groups .
...