EN 61834-10:2001

STANDARD(istoveten EN 61834-10:2001)Snemanje - Digitalni videokasetni snemalni sistem z zapisovanjem s poševnimi sledmi na magnetnem traku, širokem 6,35 mm, za splošno uporabo (sistemi 525-60, 625-50, 1125-60 in 1250-50) – 10. del: Format DTV (IEC 61834-10:2001)Recording - Helical-scan digital video cassette recording system using 6, 35 mm magnetic tape for consumer use (525-60, 625-50, 1125-60 and 1250-50 systems) - Part 10: DTV format (IEC 61834-10:2001)©
Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljenoReferenčna številkaSIST EN 61834-10:2005(en)ICS33.160.40

EUROPEAN STANDARDEN 61834-10NORME EUROPÉENNEEUROPÄISCHE NORMMay 2001CENELECEuropean Committee for Electrotechnical StandardizationComité Européen de Normalisation ElectrotechniqueEuropäisches Komitee für Elektrotechnische NormungCentral Secretariat: rue de Stassart 35, B - 1050 Brussels© 2001 CENELEC -All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.Ref. No. EN 61834-10:2001 EICS 33.160.40English versionRecording -Helical-scan digital video cassette recording systemusing 6,35 mm magnetic tape for consumer use(525-60, 625-50, 1125-60 and 1250-50 systems)Part 10: DTV format(IEC 61834-10:2001)Enregistrement -Système de magnétoscope numériqueà cassette à balayage hélicoïdalutilisant la bande magnétique de6,35 mm, destiné au grand public(systèmes 525-60, 625-50, 1125-60 et1250-50)Partie 10: Format DTV(CEI 61834-10:2001)Aufzeichnungstechnik -Videokassettensystem mit digitalerSchrägspuraufzeichnung aufMagnetband 6,35 mm für denHeimgebrauch (Systeme 525-60,625-50, 1125-60 und 1250-50)Teil 10: DTV-Format(IEC 61834-10:2001)This European Standard was approved by CENELEC on 2001-04-01. CENELEC members are bound tocomply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration.Up-to-date lists and bibliographical references concerning such national standards may be obtained onapplication to the Central Secretariat or to any CENELEC member.This European Standard exists in three official versions (English, French, German). A version in any otherlanguage made by translation under the responsibility of a CENELEC member into its own language andnotified to the Central Secretariat has the same status as the official versions.CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic,Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway,Portugal, Spain, Sweden, Switzerland and United Kingdom.

- 3 -EN 61834-10:2001Annex ZA(normative)Normative references to international publicationswith their corresponding European publicationsThis European Standard incorporates by dated or undated reference, provisions from otherpublications. These normative references are cited at the appropriate places in the text and thepublications are listed hereafter. For dated references, subsequent amendments to or revisions of anyof these publications apply to this European Standard only when incorporated in it by amendment orrevision. For undated references the latest edition of the publication referred to applies (includingamendments).NOTEWhen an international publication has been modified by common modifications, indicated by (mod), the relevantEN/HD applies.PublicationYearTitleEN/HDYearIEC 61834-11998Recording - Helical-scan digital videocassette recording system using 6,35 mmagnetic tape for consumer use(525-60, 625-50, 1125-60 and 1250-50systems)Part 1: General specificationsEN 61834-11998A12001A12001IEC 61834-21998Part 2: SD format for 525-60 and625-50 systemsEN 61834-21998IEC 61834-41998Part 4: Pack header table and contentsEN 61834-41998IEC 61834-62000Part 6: SDL formatEN 61834-62000IEC 61883-11998Consumer audio/video equipment -Digital interfacePart 1: GeneralEN 61883-11998IEC 61883-41998Part 4: MPEG2-TS data transmissionEN 61883-41998ETS 300 4681998Specification for Service Information(SI) in DVB systems--EBU SPB 4921992Teletext Specifications--

NORMEINTERNATIONALECEIIECINTERNATIONALSTANDARD61834-10Première éditionFirst edition2001-02Enregistrement – Système de magnétoscopenumérique à cassette à balayage hélicoïdalutilisant la bande magnétique de 6,35 mm,destiné au grand public (systèmes 525-60,625-50, 1125-60 et 1250-50) –Partie 10:Format DTVRecording–Helical-scan digital videocassetterecording system using 6,35 mm magnetic tapefor consumer use (525-60, 625-50, 1125-60 and1250-50 systems) –Part 10:DTV format Commission Electrotechnique Internationale International Electrotechnical CommissionPour prix, voir catalogue en vigueurFor price, see current catalogue© IEC 2001
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Copyright - all rights reservedAucune partie de cette publication ne peut être reproduite niutilisée sous quelque forme que ce soit et par aucun procédé,électronique ou mécanique, y compris la photocopie et lesmicrofilms, sans l'accord écrit de l'éditeur.No part of this publication may be reproduced or utilized inany form or by any means, electronic or mechanical,including photocopying and microfilm, without permission inwriting from the publisher.International Electrotechnical Commission3, rue de Varembé
Geneva, SwitzerlandTelefax: +41 22 919 0300e-mail: inmail@iec.ch IEC web site
http://www.iec.chCODE PRIXPRICE CODEX

61834-10 © IEC:2001– 3 –CONTENTSPageFOREWORD.7Clause1General.111.1Scope.111.2Normative references.111.3Abbreviations.131.4Environment and test conditions.152Helical recordings.152.1Tape speed, recording location and dimensions.152.2Scanner configuration.153Programme track data arrangement.173.1Labelling convention.173.2Audio sector.173.3Video sector.173.4Subcode sector.174Audio signal processing.175DTV signal processing.175.1Introduction.175.2Formatting for DTV recording.175.35_SB unit.195.4SB_extra_header.195.5Mapping TS packets onto sync blocks.195.6TSP_extra_header.195.7Location of MPEG data.215.8Normal play data.215.9Trick play data.215.10Stuffing data.235.11Error correction code.236Subcode signal processing.257System data.257.1AAUX.257.2VAUX.277.3MIC.277.4Pack header table for MPEG recording.278Data structure at digital interface.579Requirements and recommendations.599.1Selecting the recording mode.599.2Buffer requirements.599.3Deriving the timestamp from the TP_extra_header.61Bibliography.81

61834-10 © IEC:2001– 5 –PageFigure 1 – SB_extra_header.63Figure 2 – Content of SB_extra_header.65Figure 3 – 5_SB unit.65Figure 4 – TSP_extra_header.67Figure 5 – Track format of 25/12,5/6,25 Mbps recording modes.67Figure 6 – Trick play data areas and repetition cycle.69Figure 7 – Stuffing in 5_SB units.71Figure 8 – Stuffing the second TS packet in 5_SB units.71Figure 9 – Insertion of null TS packet.71Figure 10 – Stuffing in the TS packet.71Figure 11 – ECC3 code word.73Figure 12 – Interleaving on a 10-track basis (ECC3 block).73Figure 13 – Main area of VAUX.75Figure 14 – Simplified block diagram of record situation.77Figure 15 – Simplified block diagram of playback situation.79Figure 16 – Example of constant overall delay.79Table 1 – Tape speed and track angle for each recording mode.63Table 2 – Scanner configuration for multi-mode recorder.63Table 3 – Application ID of video area.63Table 4 – Relationship between number of repetitions, possible search speeds andmaximum bit rate.69Table 5 – Number of repetitions of trick play data.69Table 6 – Duration of subcode flags.73Table 7 – Duration of MPEG Source Control Pack.75Table 8 – Recommended switching points for selection of recording mode.77Table 9 – Maximum NP bit rates for different recording modes.77

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61834-10 © IEC:2001– 9 –IEC 61834 consists of the following parts, under the general title Recording – Helical-scandigital video cassette recording system using 6,35 mm magnetic tape for consumer use(525-60, 625-50, 1125-60 and 1250-50 systems):–Part 1: General specifications;–Part 2: SD format for 525-60 and 625-50 systems;–Part 3: HD format for 1125-60 and 1250-50 systems;–Part 4: Pack header table and contents;–Part 5: The character information system;–Part 6: SDL format;–Part 7: EDTV2 format;–Part 8: PALplus format for 625-50 system;–Part 9: DVB format;–Part 10: DTV format.This standard is part 10 of IEC 61834 and contains the specifications for an extendedapplication of the SD format involving the coding and recording of the DTV bit stream.Part 1 describes specifications which are common to all versions of the helical-scan digitalvideo cassette recording system, including cassettes, helical recording method, modulationmethod, magnetization and basic system data.Part 2 describes specifications for 525-60 and 625-50 systems not included in part 1.Part 3 describes specifications for 1125-60 and 1250-50 systems not included in parts 1 and 2.Part 4 describes the pack header table and the contents of packs which are applicable to allversions of the helical-scan digital video cassette system.Part 5 describes the character information system which is applicable to all versions of thehelical-scan digital video cassette system.Part 6 describes the specifications for a variant of the SD format using twice the normalcompression ratio, which are not included in part 2.Part 7 describes the specifications for an extended implementation of the SD format capable ofrecording an EDTV2 signal.Part 8 describes the specifications for an extended implementation of the SD format capable ofrecording a PALplus TV signal.Part 9 describes the specifications for an extended implementation of the SD format capable ofcoding and recording a DVB bit stream.Those interested in the manufacture of DTV digital video cassette recording systems areadvised to refer to parts 1, 2, 4, 5, and 10.The committee has decided that the contents of this publication will remain unchangeduntil 2008. At this date, the publication will bereconfirmed;withdrawn;replaced by a revised edition, oramended.

61834-10 © IEC:2001– 11 –RECORDING–HELICAL-SCAN DIGITAL VIDEO CASSETTE RECORDINGSYSTEM USING 6,35 mm MAGNETIC TAPE FOR CONSUMER USE(525-60, 625-50, 1125-60 and 1250-50 systems) –Part 10: DTV format1 General1.1 ScopeThis part of IEC 61834 specifies the content, format and recording method for the data blocksforming the helical records on the tape containing audio, video and system data. This partdescribes the specifications for the recording of single DTV programmes. The DTV data isdelivered to the digital video cassette recorder via a digital interface or by a built-in tuner (IRD).The DTV data consists of an MPEG2 transport stream containing one or more programmes.In DTV, video signal coding is based on MPEG2. One programme may consist of one video bitstream or several audio bit streams and data bit streams.Due to the varied bit rates of single DTV programmes, several recording modes are specifiedin order to make efficient use of the storage capacity of the digital video cassette recorder.In addition to the normal play data stream of DTV recording, one or two special trick play datastreams may optionally be generated and recorded in the video area.In this part, the data structure of a track is defined by APT = 000b which consists of four areasas described in 4.3.2 of IEC 61834-1 and AP1 = AP3 = 000b. The data structure of MIC is thesame as in clause 10 of IEC 61834-2.1.2 Normative referencesThe following normative documents contain provisions which, through reference in this text,constitute provisions of this part of IEC 61834. For dated references, subsequent amendmentsto, or revisions of, any of these publications do not apply. However, parties to agreementsbased on this part of IEC 61834 are encouraged to investigate the possibility of applying themost recent editions of the normative documents indicated below. For undated references, thelatest edition of the normative document referred to applies. Members of IEC and ISO maintainregisters of currently valid International Standards.IEC 61834-1:1998, Recording – Helical-scan digital video cassette recording system using6,35 mm magnetic tape for consumer use (525-60, 625-50, 1125-60 and 1250-50 systems) –Part 1: General specificationsAmendment 1

61834-10 © IEC:2001– 13 –IEC 61834-2:1998, Recording – Helical-scan digital video cassette recording system using6,35 mm magnetic tape for consumer use (525-60, 625-50, 1125-60 and 1250-50 systems) –Part 2: SD format for 525-60 and 625-50 systemsIEC 61834-4:1998, Recording – Helical-scan digital video cassette recording system using6,35 mm magnetic tape for consumer use (525-60, 625-50, 1125-60 and 1250-50 systems) –Part 4: Pack header table and contentsIEC 61834-6, Recording – Helical-scan digital video cassette recording system using 6,35 mmmagnetic tape for consumer use (525-60, 625-50, 1125-60 and 1250-50 systems) – Part 6:SDL format 1)IEC 61883-1:1998, Consumer audio/video equipment – Digital interface – Part 1: GeneralIEC 61883-4:1998, Consumer audio/video equipment – Digital interface – Part 4: MPEG2-TSdata transmissionETS 300 468:1998, Specification for Service Information (SI) in DVB systemsEBU SPB 492:1992, Teletext specifications1.3 AbbreviationsFor the purposes of this part of IEC 61834, the following abbreviations apply.AAUX:Audio auxiliary dataBCH:Base-Chaudhuri-Hocquenghem code, one of the well-known error correction codesCGMS:Copy Generation Management SystemDTV:Digital Television (MPEG transmission in USA) (differs from ATV)DVB:Digital Video Broadcast (used for organization and the signal)DVCR:Digital Video Cassette RecorderDCTDiscrete cosine transformECC:Error Correction CodeECC1:Inner error correction (within the SB)ECC2:Outer error correction (within one track)ECC3:Extra outer error correction (several tracks)EIT:Event Information TableFEC:Forward Error Correction (used in MPEG transmission)GF:Galois fieldIRD:Integrated Receiver DecoderMIC:Memory in CassetteMP@ML:Main Profile at Main LevelMP@HL:Main Profile at High LevelMPEG:Motion Pictures Expert GroupNP:Normal play________1)
To be published.
61834-10 © IEC:2001– 15 –PAT:Programme Association TablePCR:Programme Clock ReferencePID:Programme IdentificationPMT:Programme Map TablePSI:Programme Specific InformationSB:Sync blockSD/HD:Standard Definition/High Definition (recording modes on DVCR)SI:Service InformationSTB:Set-Top-BoxTp:Track pitchTP:Trick playTPH:Higher Trick play speedTPL:Lower Trick play speedTS:Transport StreamTSH:Most significant part of timestamp_counter valueTSL:Least significant part of timestamp_counter valueTSP:Transport Stream PacketVAUX:Video auxiliary data1.4 Environment and test conditionsSame as IEC 61834-2.2 Helical recordings2.1 Tape speed, recording location and dimensionsOne of three recording modes can be used. The tape speed and track angle depend on therecording mode as shown in table 1. The tape speed tolerance shall be less than ±0,5 %.Record location and dimensions for continuous recording shall be as specified in figure 1 ofIEC 61834-2. For recording, dimensions of helical tracks shall be within the tolerancesspecified in the table 3 of IEC 61834-1, except that, where applicable, parameters in table 1shall override those in table 3 of IEC 61834-1.Each sector location from the start of the SSA shall be as specified in figure 2 of IEC 61834-2and table 1 (525-60 system) of IEC 61834-2. The track centre lines shall serve as their positionreferences for specifying the pattern on tape.The values for the effective area upper edge, record and playback guarantee, overwrite margin(Om) and switching margin for recording amplifiers shall be the same as those in IEC 61834-2.2.2 Scanner configurationIf the recorder supports more than one recording mode, the scanner configuration shall beused as shown in table 2.

61834-10 © IEC:2001– 17 –3 Programme track data arrangement3.1 Labelling conventionSame as 3.2 of IEC 61834-2.3.2 Audio sectorSame as 3.3 of IEC 61834-2.3.3 Video sectorSame as 3.4 of IEC 61834-2, except AP2 as shown in table 3.3.4 Subcode sectorSame as 3.5 of IEC 61834-2.4 Audio signal processingThe audio sector may be used for recording audio data or for recording other application data.This is indicated in the bit assignment of AP1. The reserved bit assignments may be specifiedin future for new applications.If the audio sector is used for audio data, the track arrangement and processing shall complywith IEC 61834-2.5 DTV signal processing5.1 IntroductionThe DTV data format is based on MPEG2 transport stream packets of 188 bytes in length atmain profile.The transport stream packets are delivered to the recorder via a digital interface or receivedfrom a built-in tuner (IRD).Data for a single programme of the MPEG2 transport stream are recorded on tape for normal play(NP).In addition to the normal play data stream, one or two special trick play (TP) data streams mayoptionally be generated and recorded.MPEG2 coded pictures are more sensitive to errors than pictures coded according to the SDspecifications of IEC 61834-2. Therefore, optionally, additional ECC may be applied to improveerror correction capability for the MPEG2 data on tape.In many cases, the recording bit rate does not match the bit rate of NP and TP data. In thissituation, stuffing data shall be recorded for compensation.5.2 Formatting for DTV recordingThe video area is used for recording the DTV NP and TP data streams. The recording ofMPEG2 transport stream data in the video sector is indicated in AP2 (see 3.3).

61834-10 © IEC:2001– 19 –Sync blocks 31 to 155 shall be used for recording MPEG2 transport stream data.Sync blocks 21 to 30 are reserved for additional error protection (ECC3).For DTV recording, a set of MPEG packs is specified (see IEC 61834-4). These packs shall berecorded in sync blocks 19, 20 and 156 (see 7.2).5.3 5_SB unitThe video sector from sync block 21 to 155 is organized in 27 units of five sync blocks (5_SBunit) each. Every sync block of a 5_SB unit shall contain an "SB_extra_header” of one byte atbyte position number five as shown in figure 1.5.4 SB_extra_headerThe contents of the SB_extra_header shall conform to figure 2.Bit 7 shall indicate the type of data (NP or TP) in the sector of sync blocks 31 to 155. It shallindicate the presence of ECC3 data in sync blocks 21 to 30, if ECC3 is applied.If TP data is recorded, a frame_toggle bit shall be used at the border between one frame andanother in the TP data stream.In the TP data stream, the 5_SB units are repeated several times (see 5.9.3). A 5_SB unitcounter of four bits shall be used to distinguish the repetitions of 5_SB units in the TP datastream. The 5_SB unit counter shall be reset by every frame toggle. Care has to be taken, thatno more than one frame toggle occurs within one track (insert stuffing data, if needed).5.5 Mapping TS packets onto sync blocksThe sync byte shall be removed from the 188 byte transport stream packets before recordingon tape. Two of these 187 byte packets shall be recorded in five sync blocks as shown infigure 3. A TSP_extra_header of three bytes shall be added to each transport stream packet.5.6 TSP_extra_headerA timestamp is added to every TS packet. The timestamp shall be transmitted in theTSP_extra_header. The timestamp shall be derived from a 27 MHz clock. The 27 MHz clockshould be locked to the PCR values in the MPEG2 data stream (see 9.3).The timestamp represents the value of the timestamp_counter at the time of arrival of thetransport stream packet. The timestamp_counter value consists of a most significant part(TSH) and a least significant part (TSL).Bit allocation is shown in figure 4. TSL is a modulo N counter incremented by the clockfrequency of 27 MHz. N shall be 180 180 for 59,94 Hz systems. N represents the number ofclock intervals during one revolution of the head drum.The timestamp_counter should be synchronized to the recorder timing (formatting of thetracks). In this way, the same timebase is created for record and playback, as described in 9.3.TSH is a three-bit binary counter, which shall increment when the TSL counter value changesfrom N-1 to 0.

61834-10 © IEC:2001– 21 –5.7 Location of MPEG dataThe data arrangement on tracks shall be as shown in figure 5. The track format repeats everyfour tracks. This period corresponds to the repetition sequence of the pilot frequencies.The transport stream packets for NP shall be recorded only once and in the order of arrival. Ifneeded, stuffing data is inserted. Packets shall be recorded in such a way that proper timingcan be achieved during playback by using a buffer of 100 transport packets, assuming thebuffer model as shown in clause 9.Recording of TP data is optional. If TP data is applied, it shall be recorded in 5-SB units inaccordance with figure 3.There may be two separate TP data streams, TPH and TPL.• TPH is used for high search speeds in the forward and reverse directions. 5_SB units usedfor TPH data are selected in such a way that the TPH data, subcode and ITI can be read ata search speed of 18 times normal speed in the 25 Mbps mode.• TPL is meant for viewing the programme in less than real time. 5_SB units used for TPLdata are selected in such a way that the TPL data and subcode can be read at a searchspeed of four times normal speed in the 25 Mbps mode.If needed, normal play data may be written in those 5_SB units foreseen for TP, which have notbeen used for recording trick play data.When recording the NP data rate at 19,39 Mbps (one terrestrial broadcasting channel) theamount of TP
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