EP 0239914 A2 19871007 - An electronic loudspeaker system having a harmonious sound with multiple adjustable sound levels.
Title (en)
An electronic loudspeaker system having a harmonious sound with multiple adjustable sound levels.
Title (de)
Mit einem harmonischen Klang mit vielfach regulierbarer Lautstärke versehenes elektronisches Lautsprechersystem.
Title (fr)
Système à haut-parleur électronique ayant un son harmonieux avec plusieurs niveaux réglables de son.
Publication
Application
Priority
CN 86201730 U 19860325
Abstract (en)
An electronic loudspeaker which comprises a characteristic wave shape generator (1), an attenuator (2), an amplifier (3), a loudspeaker (4) and a controller (5), is designed on the basis of the principle of harmony and acoustics; the loudspeaker according to the invention has multiple and adjustable sound levels; it can give out alarming at multiple adjustable sound levels and give instructions in an analogous human voice when a vehicle is turning a corner, or moving backward, it also can be used as a microphone for public addressing. Because of its multifunction, low voice pollution, and a long service life, it is suitable for various transport means for a safe driving, and it also can be used for alarming purpose in other cases.
IPC 1-7
IPC 8 full level
H04R 3/00 (2006.01); G08B 3/10 (2006.01); H04R 27/00 (2006.01)
CPC (source: EP)
G08B 3/10 (2013.01)
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
EP 0239914 A2 19871007; EP 0239914 A3 19901010; BR 8701340 A 19871229; CN 86201730 U 19870121; JP S62272700 A 19871126
DOCDB simple family (application)
EP 87104319 A 19870324; BR 8701340 A 19870324; CN 86201730 U 19860325; JP 6926187 A 19870325