Patent ID: 7688984

Claim:
An active noise control apparatus for reducing noise from a noise source, comprising: a first detector for detecting noise produced by the noise source; a generalized finite impulse response (FIR) filter for receiving noise signals of the detected noise from said first detector, and generating control signals for reducing the noise from the noise source; and a sound generator for producing sound based on said control signals from said generalized FIR filter for substantially canceling the noise from the noise source; wherein said generalized FIR filter is described by F ⁡ ( q , θ ) = θ 0 + ∑ k = 1 N ⁢ θ k ⁢ f k ⁡ ( q ) , θ = [ θ 0 , θ 1 , … ⁢ , θ N ] where ƒ k (q) are generalized (orthonormal) basis functions including information on a desired dynamic behavior of said generalized FIR filter, θ 0 is the direct feedthrough term of said generalized FIR filter and θ k are optimal filter coefficients of said generalized FIR filter; wherein said generalized FIR filter is constructed by initializing said basis function ƒ k (q), and recursively estimating said θ k based on said initialized basis function ƒ k (q); and wherein said basis function ƒ k (q) are initialized by a predetermined dynamical model that includes initial approximate information dynamics of said generalized FIR filter.