BS EN 61835:1998

INTRODUCTION
1 General
    1.1 Scope
    1.2 Normative references
    1.3 Definitions, symbols and abbreviations
    1.4 Environment and test conditions
    1.5 Reference tape
    1.6 Calibration tape
          1.6.1 Record locations and dimensions
          1.6.2 Calibration signals
          1.6.3 Purchase
2 Video tape cassette
    2.1 Mechanical parametres
          2.1.1 Cassette dimensions
          2.1.2 Identification of cassettes
          2.1.3 Tape length, thickness and play time
          2.1.4 Coating face
          2.1.5 Datum planes
          2.1.6 Window and labels
          2.1.7 Identification holes
          2.1.8 Leader/trailer tape
          2.1.9 Reels
          2.1.10 Lid
    2.2 Video tape specification
          2.2.1 Base
          2.2.2 Width
          2.2.3 Width fluctuation
          2.2.4 Tape thickness
          2.2.5 Transmissivity
          2.2.6 Offset yield strength
          2.2.7 Magnetic coating
          2.2.8 Coating coercivity
          2.2.9 Particle orientation
3 Helical recordings
    3.1 Tape speed
    3.2 Record location and dimensions
          3.2.1 Erasure
          3.2.2 Record location and dimensions
          3.2.3 Reference edge
          3.2.4 Track pitch
          3.2.5 Flying erasure
    3.3 Helical track record tolerance zones
    3.4 Relative positions of recorded information
          3.4.1 Relative positions of the longitudinal
                  tracks
          3.4.2 Programme area reference point
    3.5 Gap azimuth
          3.5.1 Cue track, control track, time and control
                  code track
          3.5.2 Helical track
    3.6 Transport and scanner
4 Programme track data arrangement
    4.1 Introduction
    4.2 Labeling convention
    4.3 Sector details
          4.3.1 Sync block
          4.3.2 Sync pattern
          4.3.3 Identification pattern
          4.3.4 Data field
          4.3.5 Sector preamble
          4.3.6 Sector postamble (P)
    4.4 Edit gaps
    4.5 Channel coding
          4.5.1 Coding rules
          4.5.2 Data rate and wavelength
    4.6 Magnetization
          4.6.1 Polarity
          4.6.2 Recorded equalization
          4.6.3 Record level
5 Video interface
6 Audio interface
    6.1 Encoding parameters
          6.1.1 Sampling
          6.1.2 Reference level
    6.2 Digital signal interface
7 Video processing
    7.1 Introduction
    7.2 Recorded data
          7.2.1 Recorded samples and lines of the
                  television frame
          7.2.2 Non-recorded data
          7.2.3 Source precoding
    7.3 Luminance separation and video reserve data
    7.4 Channel and video block distribution
    7.5 10/8 bit arrangement
    7.6 Video randomization
    7.7 Outer error protection
    7.8 Field data array
    7.9 Order of transmission to inner coding
8 Audio processing
    8.1 Introduction
    8.2 Source coding
    8.3 Source processing
          8.3.1 Introduction
          8.3.2 Relative audio-video timing
          8.3.3 Audio data in fields
          8.3.4 Intra-field shuffling
          8.3.5 Block shuffling
          8.3.6 Audio data word processing
    8.4 Auxiliary words
          8.4.1 Channel use (CHAN)
          8.4.2 Pre-emphasis (PREF)
          8.4.3 Audio data word mode (LNGH)
          8.4.4 Block sync location (S MARK)
          8.4.5 Field number count (FNCT) for 525/60 system
          8.4.6 Edit flag (EFLG)
    8.5 Outer error protection
    8.6 Inner protection
    8.7 Order of transmission to inner coding
    8.8 Channel coding
    8.9 Allocation of audio sectors
9 Longitudinal tracks
    9.1 Relative timing
          9.1.1 Time and control code input
          9.1.2 Time and control code information
          9.1.3 Cue information
          9.1.4 Control track servo pulse
    9.2 Control track
          9.2.1 Method of recording
          9.2.2 Servo reference pulse
          9.2.3 Flux polarity
          9.2.4 Flux level
          9.2.5 Pulse width
          9.2.6 Servo reference pulse timing
          9.2.7 Colour frame pulse
          9.2.8 Video frame pulse
    9.3 Cue record
          9.3.1 Method of recording
          9.3.2 Flux level
    9.4 Time and control code record
          9.4.1 Method of recording
          9.4.2 Flux level
          9.4.3 Input signal
Figures
Annexes
A (normative) Tape tension
B (normative) Cross-tape track measurement technique
C (normative) Track pattern during insert editing
D (informative) Video signal processing
E (informative) Manufacturer
F (informative) Bibliography
ZA Normative references to international publications
    with their corresponding European publications

Specifies the electrical and mechanical characteristics of equipment allowing the interchangeability of 12.65 mm cassettes containing digitally recorded component video programmes.