Acoustic control device

An acoustic control device that controls a plurality of speakers in order for a sound pressure in a quiet area to become lower than a sound pressure in a viewing area, based on a sound source signal output from a sound source, the acoustic control device comprising:

• sound detectors each configured to detect a sound in an installed area and output a detection sound signal, at least one of the sound detectors installed in the viewing area and at least one of the sound detectors installed in the quiet area;
• and
• one or more processors that execute computer-executable instructions stored in a memory,
• wherein the one or more processors execute the computer-executable instructions to cause the acoustic control device to:
• perform signal processing on the sound source signal by a control filter, which is an adaptive finite impulse response filter, to generate a control signal that controls the speakers;
• learn as a sound field filter a sound field characteristic between the speakers and the sound detectors;
• perform signal processing on the sound source signal by the sound field filter to generate a reference signal;
• and
• update sequentially and adaptively the control filter based on the reference signal and the detection sound signal in a manner that a difference between the sound pressure in the viewing area and the sound pressure in the quiet area becomes a predetermined level.