NBN EN 61834-1 : 1999 AMD 1 2002

1 General
    1.1 Scope
    1.2 Normative reference
    1.3 Definitions, symbols and abbreviations
    1.4 Environment and test conditions
2 Cassette
    2.1 Mechanical parameters
          2.1.1 Cassette dimensions
          2.1.2 Identification of cassette
          2.1.3 Tape length
          2.1.4 Coating face
          2.1.5 Datum hole and datum plane
          2.1.6 Window and labels
          2.1.7 Identification/MIC contacts
          2.1.8 Accidental erasure prevention holes
          2.1.9 Leader/trailer tape
          2.1.10 Reels
          2.1.11 Protection lid
    2.2 Tape specification
          2.2.1 Type of magnetic tape
          2.2.2 Base
          2.2.3 Width
          2.2.4 Width fluctuation
          2.2.5 Tape thickness
          2.2.6 Transmissivity
3 Helical recordings
    3.1 Tape speed
    3.2 Record location and dimensions
          3.2.1 Reference edge
          3.2.2 Effective area
          3.2.3 Record and playback guaranteed heights
          3.2.4 Track pitch
          3.2.5 Helical track
4 System data
    4.1 Introduction
    4.2 Application ID
    4.3 System data for tape
          4.3.1 Basic system data
          4.3.2 Application ID on tape
          4.3.3 Area
    4.4 System data for MIC
          4.4.1 Basic system data
          4.4.2 Application ID on MIC
          4.4.3 Space
5 Modulation
    5.1 Introduction
    5.2 Byte position number 0, 1, 2
          5.2.1 Sync patterns
          5.2.2 Randomization and modulation
    5.3 Byte position number 3k, 3k+1, 3k+2
          5.3.1 Randomization
          5.3.2 Modulation
    5.4 Track F0, track F1, track F2
    5.5 Edit gap, run-up, guard area, preamble and
          postamble
6 ITI sector (area 0)
    6.1 Introduction
    6.2 ITI preamble
    6.3 SSA (start-sync block area)
    6.4 TIA (track information area)
    6.5 ITI Postamble
7 Magnetization
    7.1 Polarity
    7.2 Recorded equalization
    7.3 Record level
Tables
1 Mechanical tolerances
2 Assignment of the four contacts
3 Record location and dimensions
4 ITI sector location from SSA
5 Bit stream of ITI preamble for track F0
6 Bit stream of ITI preamble for Track F1
7 Bit stream of ITI preamble for track F2
8 Bit stream of SSA for track F0
9 Bit stream of SSA for track F1
10 Bit stream of SSA for track F2
11 Bit stream of TIA for track F0
12 Bit stream of TIA for track F1
13 Bit stream of TIA for track F2
14 Application ID of a track in TIA
15 Bit stream of ITI postamble for track F0
16 Bit stream of ITI postamble for track F1
17 Bit stream of ITI postamble for track F2
Figures
1 Top view and side view of standard cassette
2 Bottom view of standard cassette
3 Datum area and support area for standard cassette
4 Internal structure and tape path for standard cassette
5 Reels for standard cassette
6 Reel lock and release for standard cassette
7 Lid lock and release for standard cassette
8 Lid for standard cassette
9 Minimum space for recorder/player loading mechanism
    for standard cassette
10 Light path and leader/trailer tape for standard cassette
11 Contact area of ID board or MIC for standard cassette
12 Top and side view of small cassette
13 Bottom view of small cassette
14 Datum area and support area for small cassette
15 Internal structure and tape path for small cassette
16 Reels for small cassette
20 Minimum space for recorder/player loading mechanism
    for small cassette
21 Light path and leader/trailer tape for small cassette
22 Contact area of ID board or MIC for small cassette
23 Record location and dimensions
24 ITI sector location from SSA
25 Lag between each pair of successive tracks at the
    beginning of the SSA
26 Division of a track prescribed by APT
27 The layer of application IDs on tape
28 Address 0 of Bank 0
29 MIC memory space
30 Bit stream before interleaved NRZI modulation
31 Frequency characteristics
32 Structure of ITI sector
33 Structure of a start-sync block
34 Structure of a TI-sync block
Annex ZA Normative references to international publications
with their corresponding European publications

Defines content, format and recording procedure of the data blocks which forms the helical records on the tape. Covers the common specifications for cassettes, modulation procedure, magnetization and basic system data, for helical-scan digital video cassette recording system by means of 6.35 mm (1/4 inch) magnetic tape. Specifies the electrical and mechanical characteristics of equipment for provision of the interchangeability of recorded cassettes.