Feedforward narrow band active noise control system with online secondary path identification

Abstract

The invention belongs to the field of active noise control and discloses a feedforward narrow band active noise control system with online secondary path identification. The feedforward narrow band active noise control system aims to solve the problem that system residual noise inhibition performance is seriously affected by auxiliary noise introduced into online secondary path identification in the feedforward narrow band active noise control system. The feedforward narrow band active noise control system comprises a signal synthesis subsystem, an online secondary path identification subsystem and a residual noise separation subsystem. The signal synthesis subsystem is used for generating secondary noise source signals with same frequency as sound signals in target noise. The online secondary path identification subsystem is capable of completing online secondary path identification in real time along with running of the narrow band active noise control system and used for inhibiting the target noise. The residual noise separation subsystem is capable of separating sound signals with frequencies in limited quantity from the residual noise. Energy of the introduced auxiliary noise is regulated by the separated residual sound signals, and consequently precision and quickness in online secondary path identification are improved, and influences of the introduced auxiliary noise on the residual noise are remarkably reduced.

Description

technical field [0001] The invention is a feed-forward narrowband active noise control system with online identification of secondary channels, which belongs to the field of active noise control (ActiveNoiseControl, ANC), and specifically relates to the separation of residual noise by introducing a residual noise separation subsystem in the narrowband active noise control system. residual sound signal. Background technique [0002] Compared with traditional passive noise control technology, active noise control technology has the advantages of good low-frequency noise suppression performance and low cost. It is suitable for controlling low-frequency harmonic noise and noise in the audio frequency range. It is an improvement over traditional passive noise control technology Favorable supplement. Active noise control systems are roughly divided into three types: feedforward type, feedback type, and hybrid type. Among them, feedforward active noise control systems include broa...

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Problems solved by technology

[0006] The purpose of the present invention is to solve the auxiliary noise introduced for the online identification of the secondary channel in the traditional feed-forward narrowband noise control system with secondary channel identification, which seriously affects the reduction of the residual noise energy of the system and restricts the secondary channel identification. To solve the problem of channel online identification accuracy and speed and system residual noise suppression performance, provide a more effective and practical feed-forward narrow-band active noise control system with secondary channel online identification

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