DIN 32981 [CURRENT] references following documents:
| Document number | Edition | Title |
|---|---|---|
| DIN 32974 | 2000-02 | Acoustic signals in public traffic areas - Requirements More |
| DIN 45631 | 1991-03 | Procedure for calculating loudness level and loudness More |
| DIN 45631/A1 | 2010-03 | Calculation of loudness level and loudness from the sound spectrum - Zwicker method - Amendment 1: Calculation of the loudness of time-variant sound; with CD-ROM More |
| VDV 341 | 1994-12 | Technical Safety of Level Crossings with Tramways More |
| VDV 361 | 2016-06 | Railway Signaling Systems - Signal technical principles for non-federally owned railways More |
