Active noise control of refrigerator based on improved notch algorithm

In order to reduce the low-frequency narrowband noise generated by the vibration of the refrigerator compressor, and reduce the interference of irrelevant signals at the same time. Therefore, an improved notch algorithm with attenuation of incoherent signal interference is proposed. The algorithm consists of two delayed notch and an adaptive notch algorithm. The two adaptive notch delay algorithms are used to process the original noise and the signals irrelevant to the original noise, such as harmonic signals and environmental noise signals. The adaptive notch algorithm provides an accurate error signal for the delayed notch algorithm. Through simulation and experiment, it is proved that the improved notch algorithm can reduce the original noise of refrigerator and weaken the interference of incoherent signals.