IEC 61834-6 pdf download – Recording – Helical-scan digital video cassette recording system using 6,35 mm magnetic tape for consumer use (525-60, 625-50, 1 1 25-60 and 1 250-50 systems) – Part 6: SDL format

IEC 61834-6 pdf download – Recording – Helical-scan digital video cassette recording system using 6,35 mm magnetic tape for consumer use (525-60, 625-50, 1 1 25-60 and 1 250-50 systems) – Part 6: SDL format
1General
1.1Scope
This part of lEC 61834 describes the format extension,using higher compression to increaserecording time and reduce running cost.
While all DvCRs must have the capability of recording and/or playback in SD(SP) mode, thisextension is optional.
For this part of lEC 61834, the track data structure is defined by APT = 000b which consists offour areas as described in IEC 61834-1，4.3.2 and AP1 = AP2 = AP3 = 000b. The datastructure of MIC is as clause 10 in lEC 61834-2.
1.2 Normative references
The following normative documents contain provisions which，through reference in this text,constitute provisions of this part of lEC 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 lEC and lSO maintainregisters of currently valid lnternational 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 specifications
Amendment 1 1)
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 systems
IEC 61834-3，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 3: HDformat for 1125-60 and 1250-50 systems
IEC 61883-1:1998,Consumer audio/video equipment – Digital interface – Part 1 : GeneralIEC 61883-5:1998,Consumer audio/video equipment – Digital interface – Part 5:SDL-DVCRdata transmission
ITU-R Recommendation 601-2,Encoding parameters of digital television for studiosITU-R Report 624-4，Characteristics of television systems
1.3Definitions, symbols and abbreviations
For the purpose of this part of lEC 61834, the following definitions or abbreviations apply.AAUX:
Audio auxiliary data
BCH code:
Bose-Chaudhuri-Hocquenghem code,one of the well-known errorcorrection codes
CGMS:
Copy generation management system
DCT:
Discrete cosine transform
EOB:
End of block
MIC:
Memory in cassette
NABTS:
North American broadcasting teletext specifications
OETM events:
Optional events except text and maker’s optional events
TOc:
Table of contents
VAUX:
Video auxiliary data
VLC:
Variable length coding
1.4Environment and test conditionsSame as lEC 61834-2.
2Helical recordings2.1 Tape speed
The tape speed is 9,424/1,001 mm/s (525-60 system) or 9,424 mm/s(625-50 system).
The tape speed tolerance is ±0,5%.
2.2Record location and dimensions
Record location and dimensions for continuous recording shall be as specified in figure 1 ofIEC 61834-2.The values are listed in table 1.For recording, helical tracks shall be containedwithin the tolerance specified in table 1.
Each sector location from the start of the SSA shall be as specified in figure 2 of lEC 61834-2and table 2(525-60 system) or table 3(625-50 system).The physical tape pattern shall bespecified by the centre line of each track.
The effective area upper edge，record and playback guarantee，overwrite margin (OM) andswitching margin for recording amplifiers are as in lEC 61834-2.
2.2.1Scanner example
Scanner dimensions in table 4 are one possible configuration.Other mechanical configurationsare permitted,provided the same footprint of recorded information is produced on tape.