IEC 61904:2000

FOREWORD
1 General
      1.1 Scope
      1.2 Normative references
      1.3 Abbreviations
      1.4 Environmental and test conditions
      1.5 Reference tape
      1.6 Calibration tape
2 Videotape cassette and tape
      2.1 Mechanical parameters of cassettes
      2.2 Magnetic tape
3 Helical recordings
      3.1 Tape speed
      3.2 Record location and dimensions
      3.3 Helical track record tolerance zones
      3.4 Gap azimuth
4 Programme track data arrangement
      4.1 Introduction
      4.2 Labelling convention
      4.3 Section details
      4.4 Edit gap
      4.5 Channel coding
      4.6 Tracking servo signals
      4.7 Magnetization
5 Data arrangement in video sectors
      5.1 Introduction
      5.2 Recorded data
      5.3 Data shuffling
      5.4 DCT (discrete cosine transform)
      5.5 Quantization
      5.6 VLC (variable length code)
      5.7 Data arrangement in sync blocks
      5.8 Outer ECC
6 Data arrangement in audio sectors
      6.1 General
      6.2 Source data
      6.3 Shuffling
      6.4 Outer ECC
7 Video audio interface
      7.1 Video interface
      7.2 Audio interface
8 Longitudinal tracks
      8.1 Relative timing
      8.2 Control track
      8.3 Cue recording
      8.4 Time and control code recording
Annex A (informative) Tape transport and scanner
Annex B (informative) Compatibility with analogue type-L
Bibliography
Figure 1 - Top view and side view of S cassette
Figure 2 - Bottom view of S cassette
Figure 3 - Datum spots, supporting areas and tape guides
Figure 4 - Location of reels ready for rotation
Figure 5 - Protecting lid
Figure 6 - Reel
Figure 7 - Height of reels ready for rotation
Figure 8 - Unlocking lever insertion area
Figure 9 - Lid unlocking force
Figure 10 - Lid opening force
Figure 11 - Reel spring force
Figure 12 - Strength of safety plug
Figure 13 - Extraction force (F1, F2) and friction torque
Figure 14 - Top view and side view of L cassette
Figure 15 - Bottom view of L cassette
Figure 16 - Datum spots, supporting areas and tape guides
Figure 17 - Location of reels ready for rotation
Figure 18 - Protecting lid
Figure 19 - Reel
Figure 20 - Height of reels ready for rotation
Figure 21 - Unlocking level insertion area
Figure 22 - Lid unlocking force
Figure 23 - Lid opening force
Figure 24 - Reel spring force
Figure 25 - Strength of safety plug
Figure 26 - Extraction force (F1, F2) and friction torque
Figure 27 - Locations and dimensions of recorded tracks
Figure 28 - Locations and dimensions of tolerance zones of
            helical track records
Figure 29 - Sector arrangement on helical tracks for 525/60
            and 625/50 systems
Figure 30 - Sync block format
Figure 31 - Track, segment and field numbers
Figure 32 - Analogue to digital timing relationship (525/60
            system)
Figure 33 - Analogue to digital timing relationship (625/50
            system)
Figure 34 - Digital vertical blanking (525/60 system)
Figure 35 - Digital vertical blanking (625.50 system)
Figure 36 - Shuffling (sector distribution)
Figure 37 - Structure of VLC group
Figure 38 - Structure of coefficient clusters
Figure 39 - Sync blocks construction
Figure 40 - Video block interleave for 525/60 system
Figure 41 - Video block interleave for 625/50 system
Figure 42 - Audio video timing
Figure 43 - Audio data word assignment
Figure 44 - Ancillary data
Figure 45 - Data word allocation
Figure 46 - Intra-field shuffling for 525/60 system
Figure 47 - Block shuffling for 525/60 system
Figure 48 - Intra-field shuffling for 625/50 system
Figure 49 - Block shuffling for 625/50 system
Figure 50 - Channel sector shuffling
Figure 51 - Recorded control code waveform for 525/60 system
Figure 52 - Recorded control code waveform for 625/50 system
Figure A.1 - Possible scanner configuration (525/60 system)
Figure A.2 - Possible scanner configuration (625/50 system)
Figure A.3 - Possible longitudinal head location and tape
             wrap (525/60 system)
Figure A.4 - Possible longitudinal head location and tape
             wrap (625/50 system)
Table 1 - Tape length and play time
Table 2 - Record location and dimensions for 525/60 and
          625/50 systems
Table 3 - IDO Sync block number
Table 4 - Sector offset for 525/60 and 625/50 systems
Table 5 - Quantization
Table 6 - Category conversion
Table 7 - VLC for luminance component
Table 8 - VLC for chrominance components
Table A.1 - Parameters for a possible scanner design
Table A.2 - Data rate and wavelength
Table B.1 - Comparison of digital-L/analogue type-L recording
            parameters

Applies to video cassette recording of digital component video signals and associated digital audio and related control signals on 12,65 mm magnetic tape. Specifies characteristics of the cassettes, the tape, the recording patterns, the processes of digital audio and video coding, data compression, error protection and channel coding, all required to ensure interchangeability.