To provide a loud speaker system that performs sound-reinforced broadcasting with sound-reinforced broadcasting sound volume suitable to an approaching person even when one speaker is used.
The sound reinforcement system comprises the loud speaker which is driven with an electric signal to generate a sound, two cameras which have optical axes in the same direction and photograph a person entering a sound-reinforced broadcasting range of the loudspeaker, an image analyzing device which outputs a control signal corresponding to the distance between the loudspeaker and person from images photographed by the two cameras, and a sound volume controller which controls an attenuation quantity for the electric signal according to the control signal.
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Hidetoshi Furukawa
Suzuki Kenchi
Kajinami order