Patent ID: 6178248
Filing Date: 2001-01-23
Classification: H03H,H04R

Abstract:
A dual-processing interference cancelling system for processing an input containing a target signal originating from a target source and interferences originating from interference sources and for producing an output representing the target signal with substantially reduced interferences, comprising:a main-channel generator capable of receiving signals from such input and for generating therefrom a main channel representing signals received from the target source and having a target signal component and an interference component;a first splitter, connected to the main-channel generator, for splitting the main channel into lower and upper sub-bands, wherein the lower and upper sub-bands together form the entire main channel;a reference-channel generator capable of receiving signals from such input and for generating therefrom one or more reference channels representing signals received from the interference sources;a second splitter, connected to the reference-channel generator, for splitting said one or more reference channels into lower and upper sub-bands, wherein the lower and upper sub-bands for each reference channel together form the entire reference channel;an adaptive filter, having filter weights, connected to receive the lower sub-bands of said one or more reference channels for generating one or more cancelling signals approximating an interference component of the lower sub-band of the main channel;a subtracter, connected to the first splitter and the adaptive filter, for generating an output by subtracting said one or more cancelling signals from the lower sub-band of the main channel;the adaptive filter also being connected to receive the output from the subtracter and said system including filter-weight-updating means for determining updated filter weight values for the adaptive filter such that the differences between the lower sub-band of the main channel and the cancelling signals are substantially minimized; anda reconstructor, connected to the subtracter and to the first splitter, for reconstructing a broadband output by combining the upper sub-band of the main channel and the output from the subtracter.