Patent ID: 7764805

Claim:
An acoustic field control device comprising: a surround signal processing circuit; an acoustic field controller, wherein a left channel stereo signal and a right channel stereo signal generated from a two-channel stereo audio device are inputted to said surround signal processing circuit, and said surround signal processing circuit is configured to generate a plurality of surround signals based on a difference signal generated from the input left and right channel stereo signals and to output said plurality of surround signals to said acoustic field controller, and wherein said acoustic field controller is configured to generate an add signal for a surround effect correction from at least one of said left channel stereo signal and said right channel stereo signal before said left and right channel signals are inputted to said surround signal processing circuit, and to add said add signal to a surround signal outputted from said surround signal processing circuit to generate an acoustic sound for a behind of an audience to control an acoustic field; and one or more amplifiers for amplifying each signal to which said add signal is added.