Active noise reduction method and device for range hood

The invention provides an active noise reduction method and device of an extractor hood, the extractor hood comprises a volute, and the method comprises the steps that a first vibration signal of the volute at the current moment is collected; performing time slicing and fast Fourier transform processing on the first vibration signal to obtain a frequency spectrum and a phase of each first slice; judging whether the extractor hood is in a steady state or not according to the frequency spectrum of each first slice; if not, collecting again; if yes, the frequency spectrum and the phase of each first slice are compared with the frequency spectrum and the phase of each second slice at the next moment, and a comparison result is obtained; calculating a noise phase spectrum at the air outlet of the volute according to a comparison result and a pre-stored sound-vibration reciprocity corresponding relation; adjusting the active noise reduction source audio according to the noise phase spectrum to obtain an active nois