Study of active noise control technology for external loud-speaker systems

In this paper, two main types of noise reduction are considered: passive and active attenuation. The article is devoted to the research of active extinguishing systems (AES) technologies with an emphasis on the development of a block diagram of a module for external acoustic systems. A comparative analysis of the implementation of AES in headphones and external systems is carried out, where the key difference is the absence of natural passive isolation. An algorithm for the operation of the module based on microphone recording of the sound field of a room with subsequent generation of an antiphase signal, implemented in MATLAB, is proposed. The simulation results are presented, demonstrating the isolation of the noise component and the effectiveness of its suppression. Based on the analysis, a sketch of the structural scheme of a compact near-field AES module (up to 1 m) has been developed, including signal processing units on operational amplifiers and protection against acoustic bursts. The solution is designed for use in conditions of limited space when working with 2.0/2.1 format systems.

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