SN EN 61118 : 1993

Cooperating organizations
National foreword
Foreword
Section 1: General
1.1 Scope
1.2 Normative references
1.3 Environment and test conditions
1.3.1 Environment
1.3.2 Reference tape
1.3.3 Calibration tape
Section 2: Video tape cassette
2.1 Mechanical parameters
2.1.1 Cassette type
2.1.2 Dimensions of cassettes
2.1.3 Cassette dimension datum system
2.1.4 Window and label-pasting faces
2.1.5 Identification holes
2.1.6 Dimensions of reels
2.1.7 Tape windings
2.1.8 Unlocking of lid
2.1.9 Opening of lid
2.1.10 Releasing of reel brake
2.1.11 Automatic stop
Section 3: Video cassette recorders
3.1 Definitions
3.1.1 Scanner
3.1.2 Drum
3.1.3 Upper drum
3.1.4 Lower drum
3.1.5 Effective drum diameter
3.1.6 Helix angle
3.1.7 Track angle
3.2 Drum diameter and structure
3.2.1 Actual upper drum diameter
3.2.2 Actual lower drum diameter
3.2.3 Upper drum section
3.3 Scanner pole tips
3.3.1 Pole tip projection
3.3.2 Pole tips
3.3.3 Chordal distance between luminance and chrominance
        pole tips
3.3.4 Axial distance between luminance and chrominance
        pole tips
3.3.5 Channel identification
3.4 Helix angle
3.5 Dimensions and location of records
3.5.1 Test environment
3.5.2 Tape speed
3.5.3 Record locations and dimensions
3.5.4 Video record curvature
3.5.5 Gap azimuth
3.6 Recording characteristics
Section 4: Tape characteristics
4.1 Dimensions of video tape
4.1.1 Magnetic tape thickness
4.1.2 Magnetic tape width
4.2 Magnetic tape properties
4.2.1 Type of magnetic tape
4.2.2 Magnetic orientation
4.2.3 Coercivity
4.3 Leader tape and trailer tape
4.3.1 Automatic stop
4.3.2 Dimensions of leader and trailer tape
4.3.3 Splicing
Section 5: Recording characteristics
5.1 Video signal recording
5.1.1 Luminance channel
5.1.2 Chrominance channel
5.1.3 Y-C timing
5.1.4 Vertical interval subcarrier (VISC)
5.2 Longitudinal audio signal recording
5.2.1 Recording method
5.2.2 Recording/Reproducing reference levels
5.2.3 Frequency characteristics
5.2.4 Track usage (common audio mode)
5.2.5 Program audio head phasing
5.2.6 Recording polarity
5.3 FM audio signal recording (optional)
5.3.1 Recording/Reproducing reference levels
5.3.2 Noise reduction
5.3.3 Pre-emphasis
5.3.4 Frequency modulation
5.3.5 Recording head current
5.3.6 Recording polarity
5.4 Time and control code signal recording
5.4.1 Time and control code
5.4.2 Recording track
5.4.3 Recording method
5.4.4 Recording level
5.5 Tracking control signal recording
5.5.1 Recording track
5.5.2 Recording waveform and level
5.5.3 Polarity of remanent magnetization
5.5.4 Timing and period
5.5.5 Colour framing information
5.5.6 Magnetization level
5.5.7 Rise time
5.6 PCM audio recording (PCM audio mode)
5.6.1 Source coding
5.6.2 Signal processing
Figures
Annexes
A. (informative) Reference tape
ZA. (normative) Other international publications
      quoted in this standard with the references of the
      relevant European publications
National annex NA (informative) Committees responsible
National annex NB (informative) Cross-references

Defines dimensions and other characteristics of equipment that are needed to ensure the interchangeability of recorded cassettes. Applies to magnetic video recording using 12,65 mm (0,5 in) tape cassettes on helical-scan video tape recorders and defines the basic M2 format video cassette system. Coverage includes: environment and test conditions; drum diameter and structure; scanner pole tips; leader tape and trailer tape; longitudinal audio signal recording; tracking control signal recording. Also gives detailed definitions, diagrams and annexes.