To provide an active noise controller for preventing noise elimination signals generated so as to attenuate noise signals entering from a medium from adversely affecting from a feedback route.

A feed-forward active noise controller 50 performs on-line feedback route modeling and feedback route suppression and is provided with a reference sensor 16, a secondary source 18, an error sensor 20 and an active noise controller 10. The reference sensor 16 receives the noise signals and feedback signals 22 and generates primary signals x(n) the secondary source 18 receives secondary signals y (n) and generates corresponding noise elimination signals and the error sensor 20 receives residual signals and generates error signals e (n). The active noise controller 10 receives the primary signals x(n) and the error signals e (n) generates the secondary signals x (n) and performs the on-line feedback route modeling.