Intelligent cabin noise active control system and method with small calculated amount

The invention provides an intelligent cabin noise active control system and method with small calculation amount. The method comprises the following steps: generating a reference signal; acquiring a noise signal in the cabin as an error signal; identifying a noise main frequency through the reference signal, and selecting a local secondary path estimation model of a corresponding frequency point to calculate and obtain a filtering reference signal; filtering the reference signal and the error signal, and carrying out filter weight coefficient updating iteration by adopting a self-adaptive filtering algorithm; and convolution is carried out on the reference signal and the filter weight coefficient to obtain a loudspeaker output signal, an output sound wave signal and noise interference in a cabin are offset, and active noise control is carried out. A frequency point local secondary path estimation model # imgabs0 # is used for replacing a global secondary path estimation model # imgabs1 #, the order of the sec