Adaptive control of electrical signal amplification involves using Wiener filter, deriving normalized gain factor from estimated useful signal, estimated noise signal

The method involves feeding the signal (d(n)) to a Wiener filter whose normalized gain factor is computed by deriving an estimated useful signal from the smoothed power of the electrical signal and then deriving the estimated noise signal power and the normalized gain factor from a stated equation from these parameters. An Independent claim is also included for an application of the method to a hands-free device.