EP 1740015 A1 20070103 - Sound and public address system with decentralised amplification
Title (en)
Sound and public address system with decentralised amplification
Title (de)
Beschallungsanlage mit dezentralisierter Verstärkung
Title (fr)
Système de sonorisation et d'adresse publique avec amplification décentralisée
Publication
Application
Priority
EP 05381032 A 20050630
Abstract (en)
Sound and public address system based on the joint disposition of the amplifier and the speaker, wherein the amplification is performed with pulse-width modulation switching techniques and the amplifier is powered by a switched DC/DC voltage converter without insulation, which provides a clear improvement in the energy efficiency; all amplifier-speaker assemblies being connected to an area feeder that supplies the required power at a suitable voltage, wherein in addition the system is provided with means for monitoring the state of the amplifiers-speakers with verification that the speakers are emitting sound based on injecting a signal that allows the monitoring using either piezoelectric sensors or auxiliary coils identical to those of the speaker, transmitting the state of the speaker either through an exclusive connection or through the audio line, using a directional coupling circuit.
IPC 8 full level
H04R 27/00 (2006.01)
CPC (source: EP)
H04R 27/00 (2013.01)
Citation (search report)
- [Y] EP 0716403 A1 19960612 - NIPPON SIGNAL CO LTD [JP]
- [Y] US 2004220687 A1 20041104 - KLOTZ THOMAS [DE], et al
- [A] GB 1302534 A 19730110
- [A] US 4186437 A 19800129 - CUK SLOBODAN M [US]
- [A] US 4037222 A 19770719 - SOLOMON ELIAS E
- [A] GB 2199466 A 19880706 - G L COMMUNICATIONS LIMITED
- [A] US 2003063755 A1 20030403 - NOURSE JAMES D [US], et al
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU MC NL PL PT RO SE SI SK TR
DOCDB simple family (publication)
DOCDB simple family (application)
EP 05381032 A 20050630