BS 7360:1990

Committees responsible
National foreword
Specification
Section One - General
1. Scope
2. Object
3. Environment and test conditions
Section Two - Videotape cassette
4. Mechanical parameters
4.1 Cassette dimensions
4.2 Identification of cassettes
4.3 Tape lengths, thickness and play times
4.4 Face of magnetic coating
4.5 Datum planes
4.6 Window and labels
4.7 Identification holes
4.8 Leader/trailer tape
4.9 Reels
4.10 Lid
5. Video tape specification
5.1 Base
5.2 Width
5.3 Width fluctuation
5.4 Reference edge deviation
5.5 Tape thickness
5.6 Transmissivity
5.7 Offset yield strength
5.8 Magnetic coating
5.9 Coating coercivity
5.10 Oxide orientation
Section Three - Helical recordings
6. Tape speed
7. Record location and dimensions
8. Helical track record curvature
8.1 Tolerance zones, centrelines
9. Relative positions of recorded signals
10. Gap azimuth
10.1 Cue track, control track, time code track
10.2 Helical track
Section Four - Program track data arrangement
11. Introduction
12. Labelling convention
13. Sector details
13.1 Sync block
13.2 Sync pattern
13.3 Identification pattern
13.4 Data field
13.5 Sector preamble
13.6 Sector postamble
14. Edit gaps
15. Channel code
16. Magnetization
Section Five - Video processing
17. Recorded data
17.1 Recorded lines
17.2 Digital active lines
18. Source precoding
19. Sample labelling
20. Intersector distribution
21. Intrasector shuffling
21.1 Intraline shuffle
21.2 Sector array shuffling
22. Outer code error protection
Section Six - Audio processing
23. Introduction
24. Source coding
25. Source processing
25.1 Introduction
25.2 Segment
25.3 Audio data word processing
26. Interface control words
26.1 Channel use (CHAN) - 4 bits
26.2 Pre-emphasis (PREF) - 4 bits
26.3 Audio data word mode (LNGH) - 4 bits
26.4 Block sync location S MARK 0, S MARK 1 - 8 bits
27. Processing control words
27.1 Word count (B.CNT) - 4 bits
27.2 Overlap edit (E LAP) - 4 bits
27.3 Sequence (SEQN) - 4 bits
28. User control words (UCW)
29. Outer error protection
30. Inner protection and channel coding
31. Order of transmission to inner coding
32. Sector usage
Section Seven - Control, cue and time code track
recording
33. Control track
33.1 CT signal structure
33.2 CT magnetic orientation
33.3 CT flux level
33.4 Relation CT/helical tracks
34. Cue track
34.1 Method of recording
34.2 Flux level
34.3 Recorded flux/characteristic
34.4 Reproducer flux/frequency response
34.5 Relative timing
35. Time code track
35.1 Method of recording
35.2 Flux level
36. Longitudinal time code recording
36.1 Structure of the time code signal
36.2 Recording characteristics
36.3 Time relationship of time code and digital video
36.4 Longitudinal position of the time code record
Tables
1. Mechanical tolerances
2. Tape lengths of S, M, L cassettes
3. Reel spring force
4. Record location and dimensions for 525/60 and
      625/50 systems
5. 4-bit to 8-bit mapping
6. Size of sectors
7. Recorded lines
8. Source video mapping
9. Inverse video mapping
10. Intersector shuffling for odd and even lines
11. Intraline shuffle memory map
12. Four-field sequence of row address
13a. Intrasector shuffle memory map for sub-array 0
13b. Intrasector shuffle memory map for sub-array 1
13c. Intrasector shuffle memory map for sub-array 2
13d. Intrasector shuffle memory map for sub-array 3
13e. Intrasector shuffle memory map for sub-array 4
13f. Intrasector shuffle memory map for sub-array 5
13g. Intrasector shuffle memory map for sub-array 6
13h. Intrasector shuffle memory map for sub-array 7
13i. Intrasector shuffle memory map for sub-array 8
13j. Intrasector shuffle memory map for sub-array 9
14. Four-field intrasector shuffling
15. Examples for code error check (video)
16. Word assignment to audio and associated data
17. Sequence of audio data blocks at 29.97 Hz video
      frame frequency
18. Channel control word
19. Pre-emphasis control word
20. Ancillary data control word
21. Specification of useful data words
22. User control word count
23. Examples for code error check (audio)
Figures
1. Top view, inner structure and tape path of the
      D-1S cassette (for reference only)
2. Top view, inner structure and tape path of the
      D-1M cassette
3. Top view, inner structure and tape path of the
      D-1L cassette
4. Datum area, support area and holding area of the
      D-1S cassette
5. Datum area, support area and holding area of the
      D-1M cassette
6. Datum area, support area and holding area of the
      D-1L cassette
7. Bottom view of D-1S cassette
8. Bottom view of D-1M cassette
9. Bottom view of D-1L cassette
10. Top and side view of D-1S cassette
11. Top and side view of D-1M cassette
12. Top and side view of D-1L cassette
13. D-1S cassette coding holes and user holes
14. D-1M cassette coding holes and user holes
15. D-1L cassette coding holes and user holes
16. Video cassette reel
17. Relationship between reel and reel table
18. D-1S cassette reel lock and release
19. D-1M cassette reel lock and release
20. D-1L cassette reel lock and release
21. Lid lock and release
22. Minimum space for VTR loading mechanism
23. Lid structure
24. Location and dimensions of recorded tracks (tape
      viewed from oxide side)
25. Location of cue audio/time code and control track
      record
26. Location and dimensions of tolerance zones of
      helical track record
27. Specification of programme track azimuth angle
28. Mathematically processed measured tape data
29. Sector arrangement on programme track
30. Sector components
31. Values of sync block identification and sector
      identification codes
32a. Segment and field numbers (525/60)
32b. Segment and field numbers (625/50)
33. Block diagram of sector array shuffling
34. Word to byte conversion digital audio
35. Audio data block layout
36. Audio channel usage code
37. Audio pre-emphasis usage code
38. Ancillary data usage code
39. Audio block sync
40. Audio word block count
41. Segment specification for overlapped edits
42. Sequence count for data recovery
43. Audio sector arrangement
44. Tracking control record signal - Waveform and
      timing

Electrical and mechanical characteristics of equipment related to 525/60 and 625/50 TV systems to provide 19 mm recorded cassette interchangeability. Applies to magnetic recording of one digital video and four digital audio signals and describes the digital recording of ancillary data and analogue recording of one cue track and control track.