Fault detection method and device for active noise reduction equipment

The invention discloses a fault detection method and device of active noise reduction equipment, a medium, and equipment. The method comprises the following steps: controlling any one of J secondary sound sources to sound, calculating an initial total transfer function from the secondary sound source to K error sensors, and generating an initial transfer function matrix according to the initial total transfer function from the J secondary sound sources to the K error sensors; when fault detection is carried out, controlling any one of the J secondary sound sources to make a sound, calculatinga detection total transfer function, and generating a detection transfer function matrix according to the detection total transfer function from the J secondary sound sources to the K error sensors; judging whether any secondary sound source or error sensor has a fault or not according to the initial transfer function matrix and the detection transfer function matrix; and on the premise that hardware is not added, perform