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US 7,280,654 B2Granted
Modified affine projection algorithm for non-stationary signal
AssigneeZarlink Semiconductor Inc.
InventorGary Q. Jin
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Abstract
An affine projection or like algorithm is used to process a non-stationary signal. The affine projection algorithm creates an inverse matrix and includes a factor γ to avoid numerical instability in the inverse matrix. The factor γ is adaptively adjusted according to the characteristics of the signal.
Claims12
A method of processing a non-stationary signal comprising:
- applying an adaptive echo cancellation algorithm that creates an inverse matrix to said non-stationary signal;
- and
- adaptively adjusting the condition of said matrix according to the characteristics of said signal;
- wherein said adaptive echo cancellation algorithm is an affine projection algorithm including a factor γ provided to avoid numerical instability in said inverse matrix;
- wherein said factor γ is adaptively adjusted in accordance with the characteristics of said signal;
- and
- wherein said factor γ is set to have a value that is a predetermined amount below the average power of the last N set of signal components or the estimated power, where N is the order of projection of the algorithm.
4 more elements
Signal processing apparatus for processing a non-stationary signal comprising:
- an adaptive filter employing an echo cancellation algorithm that creates an inverse matrix to said non-stationary signal;
- and
- a control unit for adaptively adjusting the condition of said matrix according to the characteristics of said signal, and
- wherein said adaptive echo cancellation algorithm is an affine projection algorithm including a factor γ provided to avoid numerical instability in said inverse matrix;
- wherein said factor γ is adaptively adjusted in accordance with the characteristics of said signal;
- and
- wherein said factor γ is set to have a value that is a predetermined amount below the average power of the last N set of signal components or the estimated power, where N is the order of projection of the algorithm.
4 more elements
Dependencies are inferred from the claim text.