An active noise reduction system and method

Abstract

The invention provides an active noise reduction system and method. The system includes a digital signal processing board, a simulation signal collection and output board, and power supply modules parallelly arranged in a cuboid; the left surface of the cuboid is provided with an input interface 6, an output interface 7, a signal ground interface 9, a housing ground interface 10, a power plug 13, a power supply fuse 12 and a power switch 11; the simulation signal collection and output board includes two paths of simulation ADs and two paths of simulation Das, and is in connection with the input interface 6 and the output interface 7 of the active noise reduction system; the input interface 6 is used for inputting simulation electric signals generated by a sound transducer, and the output interface is used for outputting noise reduction simulation signals generated by the active noise reduction system to external electronic equipment; the digital signal processing board and the simulation signal collection and output board are parallelly arranged, and two ends of the two boards are in connection through two connectors; the digital signal processing board is used for analyzing characteristics of noise signals, and dividing the noise signals into main noise sources and minor noise sources.

Description

technical field [0001] The present invention relates to the field of noise reduction, in particular to an active noise reduction system and method. Background technique [0002] In real work and living places, various noises are common, and these noises often cause various harms to the physical and mental health of surrounding personnel, and even affect and destroy on-site production work. Therefore, in order to achieve the purpose of noise reduction, two methods of active noise reduction and passive noise reduction are often used, and the active noise reduction function is to generate a reverse sound wave equal to the external noise through the noise reduction system to neutralize the noise, thereby achieving noise reduction. noise effect. [0003] Active noise control is an active noise control technology based on the principle of coherent superposition of sound waves. It was first proposed by P.Lueg in his patent US2043416. The basic principle is to introduce a secondary...

AI Technical Summary

Problems solved by technology

The early active control system mainly focused on collecting noise and vibration information of multiple measurement points. The feedback noise reduction system was separated from the collection system. A large number of sensors at the collection points needed to be connected to the collection equipment through long analog signal lines, which added a lot of trouble. The difficulty of the necessary wiring reduces the reliability of the equipment, and the separation of the feedback system increases the difficulty of the layout and implementation of the entire active noise reduction system, making the entire system appear scattered, inefficient and unreliable

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