Introduction
1 Scope
2 Normative reference
3 Definitions
3.1 Auditory threshold
3.2 Audibility
3.3 dB(A)
3.4 Comprehensibility
3.5 Loudness
3.6 Orienting reaction
3.7 Safety critical message
3.8 Signal-to-noise ratio (SNR)
4 Signal specifications
4.1 Range of frequency
4.2 Signal levels
5 Coding of information
5.1 Comprehensibility
5.2 Temporal classification of signals
5.3 Non speech coding: tonal signals
5.4 Speech coding
6 Hierarchy of message presentation
7 Safety critical messages
References documents