變步長L-FxLMS算法的車內噪聲主動控制研究

江亮坤　顧智涵　崔懷峰

摘 要：在固定步長前饋L-FxLMS算法的基礎上，提出變步長前饋L-FxLMS算法。變步長因子通過誤差信號來調整，步長因子中包含控制變步長函數的形狀和范圍兩個參數。通過實車采集車內噪聲信號并通過固定步長和變步長L-FxLMS算法對其進行控制。仿真結果表明，所提出的變步長前饋L-FxLMS算法在收斂速度和穩態性能方面均比固定步長L-FxLMS算法更好。

關鍵詞：L-FxLMS算法 變步長 固定步長 泄漏因子 主動噪聲控制

Research on Active Control of Vehicle Interior Noise Based on Variable Step L-FxLMS Algorithm

Jiang Liangkun Gu Zhihan Cui Huaifeng

Abstract：Based on the fixed-step feedforward L-FxLMS algorithm，a variable-step feedforward L-FxLMS algorithm is proposed. The variable step size factor is adjusted by the error signal，and the step size factor contains two parameters that control the shape and range of the variable step size function. The noise signal in the car is collected by the real car and controlled by the fixed step length and variable step length L-FxLMS algorithm. The simulation results show that the proposed variable-step feedforward L-FxLMS algorithm is better than the fixed-step L-FxLMS algorithm in terms of convergence speed and steady-state performance.

Key words：L-FxLMS algorithm; variable step size; fixed step size; leakage factor; active noise control