PROBLEM TO BE SOLVED: To provide an active noise control system capable of reducing sound pressures of a plurality of dominant frequencies included in noise or the like at once.;SOLUTION: The active noise control system includes: a controller 3 for creating and outputting a control sound AS for reducing a control target sound S including three predetermined prominent frequencies a' to c' observed by a microphone 2; and a speaker 4 for emitting the control sound. The controller includes: a bandpass filter 5 for transmitting all dominant frequencies; control sound signal creation means 6b, 6c for creating control sound signals sb, sc of an opposite phase to dominant frequencies and superimposing on the bandpass signal, provided two in series, so as to cancel two dominant frequencies from a bandpass signal sp of the filter; final control sound signal creating means 6a for creating a control sound signal sa of an opposite phase to one remaining dominant frequency in the bandpass signals, provided in series with the control sound signal creation means; and superimposing means 7 for creating and outputting a control sound by overlapping the control sound signals of the control sound signal creating means.;SELECTED DRAWING: Figure 2;COPYRIGHT: (C)2020,JPO&INPIT
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