EP 0967833 A3 20040317 - PA system having zone isolator circuits
Title (en)
PA system having zone isolator circuits
Title (de)
Beschallungssystem mit Gebietsisolatorsschaltungen
Title (fr)
Système d'annonce en public avec circuits isolateurs de zone
Publication
Application
Priority
GB 9813882 A 19980627
Abstract (en)
[origin: EP0967833A2] A public address network using a single pair of signal wires (12) split in to sections using isolator circuits (20) which detect short circuit faults and open circuit faults and isolate if a fault is detected. In a fault tolerant mode an audio signal (14) and a pilot signal (15) for powering the isolators (20) are supplied from both ends of the signal wires (12). <IMAGE>
IPC 1-7
IPC 8 full level
H04R 27/00 (2006.01); H04R 29/00 (2006.01); H04R 3/12 (2006.01)
CPC (source: EP)
H04R 29/007 (2013.01); H04R 27/00 (2013.01)
Citation (search report)
- [X] DE 3627960 C1 19870903 - PHILIPS PATENTVERWALTUNG
- [XA] GB 2299238 A 19960925 - AUDIX COMMUNICATIONS LIMITED [GB]
- [A] US 3989908 A 19761102 - BUDRYS IGNAS, et al
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)
EP 0967833 A2 19991229; EP 0967833 A3 20040317; EP 0967833 B1 20121024; GB 9813882 D0 19980826
DOCDB simple family (application)
EP 99305005 A 19990625; GB 9813882 A 19980627