(19)
(11) EP 0 777 403 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
27.06.2001 Bulletin 2001/26

(43) Date of publication A2:
04.06.1997 Bulletin 1997/23

(21) Application number: 96203376.7

(22) Date of filing: 29.11.1996
(51) International Patent Classification (IPC)7H04R 3/00, H04R 27/00
(84) Designated Contracting States:
DE ES FR GB IT

(30) Priority: 29.11.1995 IT MI952485

(71) Applicant: Martinazzi, Angelo
20094 Corsico (Milano) (IT)

(72) Inventor:
  • Martinazzi, Angelo
    20094 Corsico (Milano) (IT)

(74) Representative: Mittler, Enrico 
c/o Mittler & C. s.r.l., Viale Lombardia, 20
20131 Milano
20131 Milano (IT)

   


(54) A system of sound diffusion, particularly for large spaces


(57) A system of sound diffusion comprises a device (1) for the central amplification of a source signal (Vin) for generating an amplified signal, at least one device (2) for transducing the amplified signal into a sound signal and a respective line (22) with two wires (23, 24) for the transmission of the amplified signal from the central amplification device (1) to the transducer device (2). The transducer device (2) comprises local amplification means (30) for amplifying the amplified signal received from the central amplification device for driving a loudspeaker (38). The central amplification device (1) comprises first magnetic-induction coupling means (17) for the coupling of the amplified signal to the transmission line (22) and generating means (3) for generating a direct-current voltage (V1) supplied to the transmission line (22) so that on the transmission line (22) there is present a signal variable over time induced by the amplified signal superimposed over the direct-current voltage (V1). The transducer device (2) comprises second magnetic-induction coupling means (25) for separating the signal variable over time present on the transmission line (22) from the direct-current voltage (V1), the latter supplying the local amplification means (30) and the signal variable over time being amplified by the local amplification means (30) for driving the loudspeaker (38).







Search report