Automobile active noise reduction method

Abstract

The invention discloses an automobile active noise reduction method. The method comprises steps: a reference microphone is arranged in an engine compartment, and the reference microphone is used for acquiring engine compartment noise x(n); a loudspeaker is arranged in a driving compartment, and the loudspeaker is used for producing a sound signal y(n) for cancelling the engine compartment noise x(n); an error microphone is arranged in the driving compartment, and the error microphone is used for acquiring residual noise e(n); the engine compartment noise x(n) acquired by the reference microphone serves as an input signal, the residual noise e(n) acquired by the error microphone serves as an error signal, the signals are transmitted to an adaptive filter, a characteristic matrix W of the adaptive filter is updated according to an LMS algorithm, the sound signal y(n) produced by the loudspeaker is continuously adjusted, and the residual noise e(n) is made to be minimum. When the acoustic environment in the driving compartment changes, good noise reduction can still achieved, and thus, the method is not limited to specific automobile models, and the application range is large.

Description

technical field [0001] The invention relates to the field of noise control, in particular to an automobile active noise reduction method. Background technique [0002] With the development of industrial production, transportation, urban construction and the increase of population density, environmental noise is becoming more and more serious, and has become a major public hazard that pollutes the human social environment. Noise has the characteristics of locality, temporary and multiple. Noise will not only affect the hearing and nervous system physiologically, but also psychologically make people irritable and easily cause safety hazards. [0003] When riding in a car, especially when the speed is high, the noise in the car is very high, mainly in the engine compartment noise, tire noise, air eddy noise and other aspects. When the window is opened, the wind noise will be very serious. Strong noise is not conducive to passengers' communication in the car, and driving in a ...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that the existing noise reduction scheme can only be applied to specific models of vehicles, the noise reduction and universality are not good, and it cannot adapt well to the change of the acoustic environment in the car, the present invention provides an automobile active Noise reduction methods, including:

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