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(11) | EP 0 777 403 A3 |
(12) | EUROPEAN PATENT APPLICATION |
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(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). |