The influence of sinusoidal noise canceller on noise reduction performance in feedforward hybrid active noise control system

The performance of the feedforward hybrid active noise control is influenced by the sinusoidal noise canceller which generates the broadband reference signal. In order to provide a theoretical basis for the selection and optimization of the sinusoidal noise canceller in the feedforward hybrid active noise control system, the effects of the sinusoidal noise canceller on the convergence and noise reduction performance are investigated in this work. First, the existing sinusoidal noise cancellers are compared, and a sinusoidal noise canceller based on the cascade second-order infinite impulse response notch filter bank is proposed. By deriving iterative equations of mean weight errors, the effects of the sinusoidal noise canceller on the convergence and coupling of controllers are then analyzed. Finally, the influence of the convergence rate and bandwidth of the sinusoidal noise canceller on both the transient and steady-state noise reduction performance is discussed. Extensive simulations and experiments are conducted to validate the proposed theory.