Since the narrowband active noise control (ANC) system always gives rise to frequency mismatch (FM)

the traditional frequency mismatch compensation (FMC) technique can cope with small FM

but is unable to deal with non-stationary noise signals or large FM.In order to solve the above problem

a new ANC structure with a frequency estimator is first introduced

whose inputs are measured by both the acoustic and non-acoustic sensors.The IIR notch filter based on plain gradient (PG) algorithm is employed as the frequency estimator

and the adjustment of amplitude and phase of secondary source is achieved by a first-order FIR filter updated by filtered-x LMS (FXLMS) or RLS (FXRLS) algorithm.Simulations indicated that the new system

in the condition of ensuring reasonable steady-state error

compared with the traditional FMC system

could effectively handle larger FM and revealed fine convergence and tracking performance.