Noise and interference reduction in digitized signals

摘要

A method (700, 800, 900) and apparatus (1000, 1100) increase a signal quality by analyzing an input signal and output signals from adaptive filters (410, 510, 512, 514) associated with predetermined signal plus noise plus interference classifications. An actual signal plus noise plus interference classification of the input signal is determined and one of the output signals or the input signal is selected based on a favorable Signal to Noise Ratio or a Signal to Interference plus Noise Ratio. The output signals from the adaptive filters are weighted based on analysis such as statistical analysis (310) including quantified auto-regressive analysis, Eigenvalue spread analysis, correlation analysis, feedback analysis, and covariance analysis. The predetermined classifications include various combinations of characteristics associated with the signal and interference components. The adaptive filters include multi-band and single band Adaptive Noise Canceling filters (312, 314), and multi-band and single band Adaptive Line Enhancing filters (316, 318).