BS ISO/IEC 8441-2:1991

1 Scope
2 Normative references
3 Definitions
4 Recording and reproducing characteristics
4.1 General
4.2 Tape speeds
4.3 Track configurations
4.4 Recorder/reproducer characteristics
4.5 Other characteristics
5 Methods for high density digital recording
5.1 Introduction
5.2 Record transfer function
5.3 Flux transition densities and rates for high
       density recording
5.4 Data input/output
5.5 Data sense
5.6 Reproduce equalization
5.7 Other system parameters
5.8 Auxiliary data recording
Annexes
A Operating modes, performance categories, and
       cross-play criteria for high density PCM
       recording systems
A.1 Performance categories
A.1.1 General
A.1.2 Record head gap length for category A and
       category B performance
A.1.3 Record head gap length for category C performance
A.1.4 Operating modes
A.2 Single track serial high density recording
A.2.1 Serial high density recording with wideband
       analogue recorder/reproducer (category A)
A.2.2 Parallel high density digital recording
B Recording techniques
B.1 Recording code names and their abbreviations
B.2 Enhanced NRZ format for parallel HDDR
B.2.1 ENRZ coding
B.2.2 ENRZ - parallel HDDR format
B.2.3 Summary of enhanced NRZ format
B.3 Miller squared format (M2) for parallel HDDR
B.3.1 Miller squared coding
B.3.2 M2 format for parallel HDDR
B.3.3 Summary of M2 format
B.3.4 M2 format bandwidth utilization/packing density
B.4 Randomized NRZ-L format parallel HDDR
B.4.1 RNRZ-L coding
B.4.2 RNRZ-L parallel HDDR format
B.4.3 Summary of randomized NRZ-L format
B.4.4 Randomized NRZ-L format bandwidth utilization/
       packing density
B.5 PROP format for parallel HDDR (pseudo random odd
       parity)
B.5.1 General
B.5.2 Summary of PROP format
B.5.3 PROP format bandwidth utilization
B.6 3PM format bandwidth utilization
B.6.1 General
B.6.2 3PM format versions
B.6.3 Error detection and correction (formats A and B)
B.6.4 Summary of 3PM formats A and B
B.6.5 3PM format bandwidth utilization
B.7 MODAS airborne recording format
B.7.1 General
B.7.2 Description

Gives the minimum performance levels needed for the effective interchange of information using High Density Digital Recording (HDDR). It also describes procedures of testing for determining these levels. It gives guidance on recorders/reproducer characteristics, modes of recording, and modulation patterns.