Adaptive filter
AssigneeLucent Technologies Inc.
InventorDonald Lars Duttweiler
Life of this patent
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Abstract
An adaptive filter and method that proportionately adjusts individual tap gain distributors such that the individually adjusted tap gains are not necessarily equal to one another and that the average of tap gains remains substantially constant. The filter employs a proportionate normalized least-means-squares (PNLMS) method of adaptation that imparts improved convergence speed over prior art adaptive filters that utilize a normalized least-means-squares (NLMS) method of adaptation, without affecting the adaptation quality of the filter.
Claims10
An adaptive filter for synthesizing an approximation of a system having an incoming path and an outgoing path, said adaptive filter comprising:
- an adjustable signal processor means connected to the incoming path, said signal processing means including:
- means for generating a plurality of amplitude coefficient signals;
- means for distributing a tap gain associated with each of said amplitude coefficient signals;
- and
- means responsive to applied signals for individually adjusting the tap gain distributor means associated with each of said plurality of amplitude coefficient signals in such a way that individual tap gains are not necessarily equal to one another and an average of the individual tap gains remains substantially constant;
- means connected to the outgoing path for algebraically combining signals in the outgoing path with signals supplied from the signal processing means;
- and
- means responsive to said combined signals for adjusting said signal processing means.
An adaptive filter for synthesizing an approximation of a system having an incoming path and an outgoing path, said adaptive filter comprising:
- an adjustable signal processor means connected to the incoming path, said signal processing means including:
- a delay line tapped at desired intervals;
- and
- means responsive to applied signals for individually adjusting a tap gain distributor associated with each of said taps in such a way that said individual tap gains are not necessarily equal to one another and an average of the individual tap gains remains substantially constant;
- means connected to the outgoing path for algebraically combining signals in the outgoing path with signals supplied from the signal processing means;
- and
- means responsive to said combined signals for adjusting said signal processing means.
An adaptive filter for synthesizing an approximation of an arbitrary system that is connected to a communication system by an incoming path and an outgoing path, said adaptive filter comprising:
- an adjustable signal processor connected to the incoming path, said signal processor including:
- a delay line tapped at desired intervals;
- and
- an output estimator responsive to applied signals for individually adjusting a tap gain distributor associated with each of said taps in such a way that said individual tap gains are not necessarily equal to one another and an average of the individual tap gains remains substantially constant;
- a combining network, connected to the outgoing path for algebraically combining signals in the outgoing path with signals supplied from the signal processor;
- and
- an adjustment network responsive to said combined signals for adjusting said signal processor.
Dependencies are inferred from the claim text.