EP 1123637 B1 20050112 - PUBLIC ADDRESS APPARATUS
Title (en)
PUBLIC ADDRESS APPARATUS
Title (de)
BESCHALLUNGSANLAGE
Title (fr)
SYSTEME DE HAUT-PARLEURS
Publication
Application
Priority
- GB 9903141 W 19990921
- GB 9820644 A 19980922
Abstract (en)
[origin: WO0018188A2] A public address apparatus comprises a number of sounders each provided with storage means in order to store a number of pre-recorded messages. A central control unit is also provided arranged to send control signals to each of the sounders, the control signals comprising an initial synchronisation and calibration pulse, followed by a second pulse of variable duration. The duration of the second pulse is used to indicate which of the pre-recorded messages to be played in response to at least one detector which provides an input to the central control unit. The arrangement has the advantage that synchronisation of the messages played by each of the sounders can be ensured.
IPC 1-7
IPC 8 full level
H04R 3/00 (2006.01); H04R 27/00 (2006.01)
CPC (source: EP)
H04R 27/00 (2013.01)
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
WO 0018188 A2 20000330; WO 0018188 A3 20000608; AT E287193 T1 20050115; AU 6211299 A 20000410; DE 69923203 D1 20050217; DE 69923203 T2 20051229; EP 1123637 A2 20010816; EP 1123637 B1 20050112; GB 9820644 D0 19981118; JP 2002526007 A 20020813
DOCDB simple family (application)
GB 9903141 W 19990921; AT 99949117 T 19990921; AU 6211299 A 19990921; DE 69923203 T 19990921; EP 99949117 A 19990921; GB 9820644 A 19980922; JP 2000571715 A 19990921