Adaptive system for noise cancellation in wireless communications

An adaptive system, which provides engine noise cancellation for hands-free cellular phones, is developed. The system employs a cascade of three second-order adaptive notch/bandpass filters based on Gray-Markel lattice structure. This structure defines the high stability of the adaptive system. A Newton type algorithm is used for updating the filter coefficients that determines fast adaptation. One of the significant advantages of the proposed system is its low computational complexity. The presented adaptive system for engine noise cancellation could improve considerably the speech intelligibility of hands-free cellular phones.