Noise reduction method and device for vehicle

Abstract

The invention discloses a noise reduction method for a vehicle, and the method comprises the following steps: S1, respectively measuring a loudspeaker of each sound reproduction channel of a vehicle-mounted audio system, and obtaining the maximum non-distortion output amplitude of a signal corresponding to each frequency point in a frequency domain; S2, generating a reference signal, and filteringthe reference signal through an adaptive filter to generate a control signal; S3, comparing the control signal with the maximum output amplitude, if the control signal is not greater than the maximumvalue of the maximum output amplitude, directly converting the control signal into an analog signal, and feeding the analog signal to loudspeakers of corresponding sound reproduction channels througha power amplifier; and if the control signal is greater than the maximum value of the maximum output amplitude, performing power compression on the control signal, converting the control signal subjected to power compression into an analog signal, and feeding the analog signal to the loudspeakers of corresponding sound reproduction channels through the power amplifier. The possibility of the divergence of an active noise control system can be solved, and abnormal sound is prevented from being generated as soon as possible.

Description

technical field [0001] The invention belongs to the technical field of vehicle noise reduction, and relates to a noise reduction method and device for vehicles. Background technique [0002] With the improvement of vehicle intelligence, drivers and passengers have increasingly strict requirements on the acoustic environment in the vehicle. The noise in the car will reduce the comfort of the drivers and passengers, causing irritability and fatigue of the occupants in the car; it will also affect the clarity of communication and communication, and even affect the driver's perception of the signal sound outside the car, increasing traffic hazards. Automotive NVH (Noise, Vibration, Harshness) is an important issue car manufacturers care about. By modifying the structural design, adding damping materials or using devices such as shock absorbing springs to reduce noise, collectively referred to as passive noise control. This passive noise control method has a better noise reduct...

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Problems solved by technology

[0007] 3. Control by detecting changes in the noise field. If suppressed too early, it may affect the noise reduction performance of the active noise reduction system;

[0008] 4. After detecting the risk of divergence of the active noise reduction system, the method of resetting the active control system is often adopted; under certain acoustic conditions, the risk of system divergence is not eliminated, and the system will re-enter the deadlock of divergence; resulting in the entire active control The system emits periodic high and low intermittent beeps; this is also a problem in many current mass production solutions

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