EP1128358A1 EP20000200581 EP00200581A EP1128358A1 EP 1128358 A1 EP1128358 A1 EP 1128358A1 EP 20000200581 EP20000200581 EP 20000200581 EP 00200581 A EP00200581 A EP 00200581A EP 1128358 A1 EP1128358 A1 EP 1128358A1 Authority EP European Patent Office Prior art keywords audio user layers parameters environment Prior art date 2000-02-21 Legal status (The legal …