NA 023
DIN Standards Committee Ergonomics
DIN EN ISO 9921 [CURRENT] references following documents:
| Document number | Edition | Title |
|---|---|---|
| IEC 60268-16 | 2003-05 | Sound system equipment - Part 16: Objective rating of speech intelligibility by speech transmission index More |
| IEC 60849 | 1998-02 | Sound systems for emergency purposes More |
| ISO 11429 | 1996-12 | Ergonomics - System of auditory and visual danger information signals More |
| ISO 7731 | 2003-11 | Ergonomics - Danger signals for public and work areas - Auditory danger signals More |
