(19)
(11) EP 0 239 914 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
10.10.1990 Bulletin 1990/41

(43) Date of publication A2:
07.10.1987 Bulletin 1987/41

(21) Application number: 87104319.6

(22) Date of filing: 24.03.1987
(51) International Patent Classification (IPC)4: G08B 3/10, G10K 15/02
(84) Designated Contracting States:
DE FR GB IT

(30) Priority: 25.03.1986 CN 86201730

(71) Applicants:
  • Zong, You-gen
    Suzhou City Jiangsu Province (CN)
  • Qian, Wei-guang
    Suzhou City Jiangsu Province (CN)

(72) Inventors:
  • Zong, You-gen
    Suzhou City Jiangsu Province (CN)
  • Qian, Wei-guang
    Suzhou City Jiangsu Province (CN)

(74) Representative: Dipl.-Phys.Dr. Manitz Dipl.-Ing. Finsterwald Dipl.-Ing. Grämkow Dipl.Chem.Dr. Heyn Dipl.Phys. Rotermund Morgan, B.Sc.(Phys.) 
Postfach 22 16 11
80506 München
80506 München (DE)


(56) References cited: : 
   
       


    (54) An electronic loudspeaker system having a harmonious sound with multiple adjustable sound levels


    (57) 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.







    Search report