Active noise reduction strategy and system for fixed sound characteristic noise source

Abstract

The invention discloses an active noise reduction strategy and system for a fixed sound characteristic noise source, and relates to the field of sound processing. The active noise reduction strategy sequentially comprise a noise analysis and secondary sound source construction stage, an installation and working stage and an evaluation and adjustment stage, wherein the evaluation and adjustment stage feeds back information to the installation and working stage. A noise receiving and noise reduction effect evaluation assembly is used for receiving noise emitted by a noise source, analyzing the received noise by using a sound analysis program to obtain sound characteristics, and then producing secondary sound with complementary phases; a secondary sound source assembly executes a pre-designed scheme according to a control program, emits a secondary sound wave with a specific frequency and a sound pressure level at a specific time, is used for counteracting noise emitted by the noise source in a specific propagation direction, is connected to a controller of the noise source, and operates together with the noise source; and a passive noise reduction assembly is used for absorbing superposed sound waves of the noise source and the secondary sound source in the direction opposite to the noise propagation direction. The device has a good noise reduction effect.

Description

technical field [0001] The present invention relates to the field of sound processing, in particular to an active noise reduction strategy and system for noise sources with fixed acoustic characteristics. Background technique [0002] Sound is a sound wave generated by the vibration of an object. On the waveform diagram, it includes three elements: sound frequency, sound amplitude, and sound phase. Noise is a kind of sound that causes irritability or is too loud and endangers human health. From the perspective of environmental protection, all the sounds that hinder people's normal rest, study and work, and the sounds that interfere with the sounds that people want to listen to are all noise. From a physical point of view, noise is the sound produced when the sounding body vibrates randomly. In daily life, noise is generated by mechanical friction, cutting, resonance and other vibrations of equipment, propagates through media, and is received by sound receptors at inappropr...

AI Technical Summary

Problems solved by technology

[0016] The present invention aims to solve the problems of poor noise reduction effect and unstable noise reduction effect in the process of passive noise reduction technology processing fixed sound frequency noise, and high operating cost and high operating cost in the process of active noise reduction technology processing fixed sound frequency noise. The location of the secondary sound source is uncertain, the evaluation of the noise reduction effect is affected by the background sound, the response is delayed, and the secondary sound pollution may occur. An active noise reduction strategy and device developed for fixed acoustic characteristic noise sources. The device It has the advantages of good noise reduction effect, timely response, flexible operation, low cost, adjustable, less secondary sound pollution, and high intelligence level.

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