NF EN 61327 : 1996

Foreword
Introduction
1 General
1.1 Scope and object
1.2 Normative references
1.3 Definitions, symbols and abbreviations
2 Technical data
2.1 Environment and test conditions
2.2 Reference tape
2.3 Calibration tape
2.3.1 Record locations and dimensions
2.3.2 Calibration signals
2.3.3 Purchase
3 Video tape cassette
3.1 Mechanical parameters
3.1.1 Cassette dimensions
3.1.2 Identification of cassettes
3.1.3 Tape length, thickness and play times
3.1.4 Coating face
3.1.5 Datum planes
3.1.6 Window and labels
3.1.7 Identification holes
3.1.8 Leader/trailer tape
3.1.9 Reels
3.1.10 Lid
3.2 Video tape specification
3.2.1 Base
3.2.2 Width
3.2.3 Width fluctuation
3.2.4 Reference edge straightness
3.2.5 Tape thickness
3.2.6 Transmissivity
3.2.7 Offset yield strength
3.2.8 Magnetic coating
3.2.9 Coating coercivity
3.2.10 Particle orientation
4 Helical recordings
4.1 Tape speed
4.2 Erase head and record location and dimensions
4.2.1 Erase head
4.2.2 Record location and dimensions
4.2.3 Reference edge
4.2.4 Track pitch
4.2.5 Flying erase heads
4.3 Helical track record tolerance zones
4.4 Relative positions of recorded signals
4.4.1 Relative positions of the longitudinal tracks
4.4.2 Helical/control track relationship
4.4.3 Programme area reference point
4.5 Gap azimuth
4.5.1 Cue track, control track, time and control
       code track
4.5.2 Helical track
4.6 Transport and scanner
5 Programme track data arrangement
5.1 Introduction
5.2 Labelling convention
5.3 Sector details
5.3.1 Sync block
5.3.2 Sync pattern
5.3.3 Identification pattern
5.3.4 Data field
5.3.5 Sector preamble
5.3.6 Sector postamble
5.4 Edit gaps
5.5 Channel coding
5.5.1 Coding rules
5.5.2 Data rate and wavelength
5.6 Magnetization
5.6.1 Polarity
5.6.2 Recorded equalization
5.6.3 Record level
6 Video interface
6.1 Encoding parameters
6.2 Parallel digital signal interface
7 Audio interface
7.1 Encoding parameters
7.1.1 Sampling
7.1.2 Reference level
7.2 Digital signal interface
8 Video processing
8.1 Recorded and non-recorded data
8.1.1 Recorded samples of digital active line and
       lines of the television frame
8.1.2 Non-recorded data
8.1.3 Source pre-coding
8.2 Channel distribution of samples
8.3 Shuffling
8.3.1 Introduction
8.3.2 Algebraic definition
8.4 Field data array
8.5 Outer error protection
8.6 Order of transmission to inner coding
9 Audio processing
9.1 Introduction
9.2 Source coding
9.3 Source processing
9.3.1 Introduction
9.3.2 Relative audio-video timing
9.3.3 Audio data in fields
9.3.4 Intra-field shuffling
9.3.5 Block shuffling
9.3.6 Audio data word processing
9.4 Auxiliary words
9.4.1 Channel use (CHAN)
9.4.2 Pre-emphasis (PREF)
9.4.3 Audio data word mode (LNGH)
9.4.4 Block sync location (S MARK)
9.4.5 Field number count (FNCT) for 525/60 system
9.4.6 Edit flag (EFLG)
9.5 Outer error protection
9.6 Inner protection
9.7 Order of transmission to inner coding
9.8 Channel code
9.9 Allocation of audio sectors
10 Longitudinal tracks
10.1 Relative timing
10.1.1 Time and control code input
10.1.2 Time and control code information
10.1.3 Cue information
10.1.4 Control track servo pulse
10.2 Control track
10.2.1 Method of recording
10.2.2 Servo reference pulse
10.2.3 Flux polarity
10.2.4 Flux level
10.2.5 Pulse width
10.2.6 Servo reference pulse timing
10.2.7 Colour frame pulse
10.2.8 Video frame pulse
10.3 Cue record
10.3.1 Method of recording
10.3.2 Flux level
10.4 Time and control code record
10.4.1 Method of recording
10.4.2 Flux level
10.4.3 Input signal
Figures
Annexes
A Cross-tape track measurement technique
B Track pattern during insert editing
C Bibliography
ZA (normative) Normative references to international
       publications with their corresponding European
       publications

Specifies the format, content and recording method of the data blocks forming the helical records on the tape containing audio, video and associated data using the 12,65 mm (0,5 in) type D-3 cassettes. Also specifies the content, format and recording method of the longitudinal record containing tracking information for the scanning head associated with the helical methods.