Patent ID: 8532308

Claim:
A standing-wave detection apparatus for detecting a standing wave in a predetermined space, comprising: a sound-receiving unit adapted to receive a sound generated from a sound source arranged in the predetermined space; a storage unit adapted to store time series sound pressure level data acquired by said sound-receiving unit during movement along a path in the predetermined space; a level adjustment unit adapted to derive an adjustment curve determined based on a lower envelope of the time series sound pressure level data stored in said storage unit, and to adjust the time series sound pressure level data stored in said storage unit by subtracting, from a sound pressure level value at each point of time of the time series sound pressure level data, a value at a corresponding point of time on the adjustment curve; and a detection unit adapted to detect an existence position of a standing wave in the predetermined space based on the adjusted time series sound pressure level data, wherein each of the level adjustment unit and the detection unit is implemented by using one or more processors.