EN 60774-1:1994

FOREWORD
SECTION 1: GENERAL
  1.1 Scope
  1.2 Normative references
  1.3 Environment
SECTION 2: VHS VIDEO TAPE CASSETTE
  2.1 Mechanical parameters
      2.1.1 Cassette dimensions
      2.1.2 Reel dimensions
      2.1.3 Tape winding and tape path
      2.1.4 Unlocking of front cover
      2.1.5 Opening of front cover
      2.1.6 Releasing of reel brake
      2.1.7 Reel spring
SECTION 3: COMPACT VHS VIDEO CASSETTE
  3.1 Mechanical parameters
      3.1.1 Cassette dimensions
      3.1.2 Front cover
      3.1.3 Reel dimensions and brake force
      3.1.4 Tape winding and tape path
      3.1.5 E value
      3.1.6 Guide rollers
      3.1.7 Reel spring force
      3.1.8 Positioning screw of take-up reel
SECTION 4: TAPE CHARACTERISTICS OF VHS AND COMPACT VHS CASSETTE
  4.1 Dimensions of the video tape
      4.1.1 Magnetic tape thickness
      4.1.2 Magnetic tape width
      4.1.3 Magnetic tape length
  4.2 Magnetic tape properties
      4.2.1 Type of magnetic tape
      4.2.2 Magnetic orientation
      4.2.3 Coercivity
  4.3 Reference tape
  4.4 Leader tape and trailer tape
      4.4.1 Automatic stop
      4.4.2 Dimensions of the leader and trailer tape (VHS cassette)
      4.4.3 Dimensions of the leader and trailer tape (compact
            VHS cassette)
      4.4.4 Splicing
  4.5 Amount of tape remaining
SECTION 5: VIDEO CASSETTE RECORDERS
  5.1 Tape speed
  5.2 Drum diameter
  5.3 Tape tension
  5.4 Inclined azimuth angle
  5.5 Track configuration and dimensions
      5.5.1 Record locations
      5.5.2 Switching position and video signal overlap
      5.5.3 Relations of video track and video signal field
SECTION 6: RECORDING CHARACTERISTICS
  6.1 FM recording of luminance component
      6.1.1 Low-pass filter
      6.1.2 Pre-emphasis and clipping
      6.1.3 Modulation characteristics
      6.1.4 FM high-pass filter
      6.1.5 Recording level
  6.2 NTSC chrominance signal recording
      6.2.1 Recording method
      6.2.2 Phase rotation of the chrominance signal
      6.2.3 Recording level
      6.2.4 Colour burst amplitude doubler
  6.3 PAL chrominance signal recording
      6.3.1 Recording method
      6.3.2 Phase rotation of the chrominance signal
      6.3.3 Recording level
  6.4 SECAM chrominance signal recording
      6.4.1 Recording method
      6.4.2 Recording level
  6.5 Audio signal recording
      6.5.1 Recording level
      6.5.2 De-emphasis characteristics
  6.6 Control signal recording
      6.6.1 Recording signal
      6.6.2 Polarity
      6.6.3 Recording current wave-form
Figures
Annexes
A - Type of VHS cassettes and specifications
B - Designation of compact VHS video cassettes and specifications
C - Reference tape
D - Compact VHS video cassette adaptor
E - Alternative method of SECAM chrominance signal recording
ANNEX ZA (normative) OTHER INTERNATIONAL PUBLICATIONS QUOTED
         IN THIS STANDARD WITH THE REFERENCES OF THE RELEVANT
         EUROPEAN PUBLICATIONS

Defines the electrical and mechanical parameters and the necessary characteristics of the VHS and the compact VHS video cassette system. The requirements relate to the 525 line-60 field and 625 line-50 field TV systems. Equipment manufactured according to this standard and tapes recorded following this standard, provide the necessary interchangeability of recorded video cassettes.