Broadband and narrowband hybrid active noise reduction algorithm suitable for vehicle

Abstract

The invention discloses a broadband and narrowband hybrid active noise reduction algorithm suitable for a vehicle, and the algorithm comprises the steps: 1, obtaining a system reference noise signal and the frequency of a narrowband component in the system reference noise signal, and obtaining internal reference signals of a sine noise separator and a narrowband active noise reduction system; 2, obtaining a reference signal of a broadband active noise reduction subsystem according to the internal reference signals, and obtaining an output signal of the broadband active noise reduction subsystem according to the reference signal of the broadband active noise reduction subsystem; obtaining an output signal of a narrowband active noise reduction subsystem according to the internal reference signal; and 3, summing the output signal of the broadband active noise reduction subsystem and the output signal of the narrowband active noise reduction subsystem to obtain an output signal of the broadband and narrowband hybrid active noise reduction system.

Description

technical field [0001] The invention belongs to the technical field of active noise control, in particular to a wide-narrowband hybrid active noise reduction algorithm suitable for vehicles. Background technique [0002] Nowadays, with people's pursuit of comfort and NVH performance in the car, more and more attention has been paid to the noise inside the car. The noise generated by the car not only causes noise pollution to the public environment outside the car, but the noise inside the car can also affect people's emotions, and even lead to distraction, which brings huge safety hazards to the driving of vehicles. High sound pressure level noise also has a serious negative impact on human health, causing indigestion, loss of appetite, nausea and vomiting and other adverse reactions. Being in a noisy environment for a long time will not only affect driving safety, but also cause great harm to people's physical and mental health. Therefore, controlling interior noise has b...

AI Technical Summary

Problems solved by technology

The control of road noise usually requires multiple acceleration sensors arranged on the car suspension to obtain a reference signal with high coherence with road noise, but the use of accelerometers will lead to increased costs

If the microphone is used to collect the reference signal in the car and the broadband active noise reduction system is used for active control, the cost can be reduced, but the performance of the system is poor when there is a narrowband component in the reference signal, and the wideband and narrowband hybrid control can simultaneously control the collected noise Effective noise reduction for broadband components and narrowband components. If it can be applied to the car, it can avoid the construction of a separate reference signal for road noise and reduce the cost of sensors, and can effectively control engine order narrowband noise.

However, the current broadband and narrowband hybrid active noise control system is mainly used for pipeline control, and there are coupling problems between the two subsystems inside the system, which affects the overall convergence speed of the system

On the other hand, the filter-x least mean square (FxLMS) algorithm with a fixed step size is widely used in the active noise reduction system, which has the defect that the convergence speed and the steady-state error cannot be balanced, that is, when the step size is large, the convergence The speed is fast, but the steady-state error is large. When the step size is small, the steady-state error is small but the convergence speed is slow

Images