초록 ▼

A dual-processing interference cancelling system and method for processing a broadband input in a computationally efficient manner. Dual processing divides the input into higher and lower frequency bands and applies adaptive filter processing to the lower frequency band while applying non-adaptive f

A dual-processing interference cancelling system and method for processing a broadband input in a computationally efficient manner. Dual processing divides the input into higher and lower frequency bands and applies adaptive filter processing to the lower frequency band while applying non-adaptive filter processing to the higher frequency band. Various embodiments are shown including those based on sub-bands, broadband processing with band-limited adaptation, and broadband processing with an external main-channel generator.

대표청구항 ▼

[ What is claimed is:] [1.] 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 reduc

[ What is claimed is:] [1.] 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.