Method and system for stabilization of frequency range in active noise controlling by integrating feedback and feedforward block

摘要

The present invention relates to a frequency domain stabilization method and system for feedback active noise control, and more particularly, when a divergence phenomenon is detected with respect to a signal undergoing active noise removal processing by an offset signal, the magnitude of the offset signal is reduced to a certain level or less. The present invention relates to a frequency domain stabilization method and system for feedback active noise control that suppresses noise emission by controlling it. According to the present invention, in a system for actively removing noise by an offset signal generated from a speaker, the feedforward active noise control and the feedback active noise control are integrated into one block, and the feedforward control output signal and the feedback control output signal To provide an efficient active control method and system that reduces the complexity of an active control system by managing it as one control output signal without the need to separately manage it. In addition, when the level of the signal expressed in the frequency domain during active noise removal processing reaches a value above a certain level, it is judged as noise divergence and the magnitude of the offset signal is controlled below a certain level by the frequency domain weight. To provide an active noise control method and system that fundamentally blocks the divergence of noise.