Active control system of noise in vehicle

Abstract

The present invention provides an active control system of noise in a vehicle. The active control system of noise in a vehicle comprises a reference signal forming unit, a channel identifying unit, anadaptive filter unit, loudspeakers, and an error signal pick-up and analysis unit, wherein the adaptive filter unit is connected to the reference signal forming unit, the channel identifying unit, and the loudspeakers. The technical scheme of the active control system of noise in a vehicle can effectively avoid secondary acoustic noise pollution, can facilitate the filter to perform re-identification according to actual conditions, can reduce the development cycle, and can effectively improve system noise reduction effect in a three-dimensional space.

Description

technical field [0001] The invention relates to the field of noise reduction, in particular to an active control system for noise inside a vehicle. Background technique [0002] With the development of the automobile industry and people's pursuit of high-quality life, the noise level in the car has increasingly become one of the main factors affecting product competitiveness. Traditionally, passive methods are used to reduce noise inside the car. Noise generation is reduced by optimizing the structure of the car, and sound-absorbing materials are used to reduce noise physically. Passive noise reduction takes up a lot of space, has poor flexibility, and has a long development cycle. The existing active noise reduction system generally uses a microphone to directly pick up the reference signal in the cockpit, but the secondary sound emitted by the speaker will propagate backward to the reference signal microphone, causing secondary sound pollution, affecting the accuracy of th...

AI Technical Summary

Problems solved by technology

Traditionally, passive methods are used to reduce noise inside the car. Noise generation is reduced by optimizing the structure of the car, and sound-absorbing materials are used to reduce noise physically. Passive noise reduction takes up a lot of space, has poor flexibility, and has a long development cycle.

The existing active noise reduction system generally uses a microphone to directly pick up the reference signal in the cockpit, but the secondary sound emitted by the speaker will propagate backward to the reference signal microphone, causing secondary sound pollution, affecting the accuracy of the reference signal, and reducing the noise reduction. Noise effect and system stability; and in three-dimensional space, the residual noise after noise reduction will spread in all directions, and it is not accurate to use a single error sensor to collect residual noise, which will also reduce the noise reduction effect

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