Method of iterative noise estimation in a recursive framework

摘要

A method and apparatus estimate additive noise in a noisy signal using an iterative technique within a recursive framework. In particular, the noisy signal is divided into frames and the noise in each frame is determined based on the noise in another frame and the noise determined in a previous iteration for the current frame. In one particular embodiment, the noise found in a previous iteration for a frame is used to define an expansion point for a Taylor series approximation that is used to estimate the noise in the current frame.The noise estimation employs a recursive-Expectation-Maximization framework based on a MAP (maximum a posterior) criteria. <IMAGE>