四阶带通箱的自回归滑动平均模型

建立扬声器系统的离散时间模型是对其进行数字控制的基础。研究给出了使用LR-2理论优化的四阶带通箱的自回归滑动平均模型,推导其传递函数方程组,构建其时域差分迭代式,形成离散时间形式的表述,用以描述系统的瞬态行为。实验结果表明,与基于状态空间方程的差分求解方法相比,该文给出的自回归滑动平均模型更为稳定精确,对采样率的要求更低。该方法为实现对扬声器的前馈数字控制提供了参考。

Autoregressive moving average model of fourth-order band-pass loudspeaker systems

Discrete-time model is the basis for digital controlling the loudspeaker system. An autoregressive moving average (ARMA) model of fourth-order band-pass loudspeaker system improved by LR-2 theory is proposed. Transfer function of the model is presented and then transformed to time domain difference equations to depict the instantaneous status of the loudspeaker system. The experimental results illustrate that, compared with the numerical simulation results from the state-space equation, the ARMA model proposed in this paper is more stable and precise, also shows lower sampling rate requirements.