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US 9,002,918 B2Granted
Adaptive signal processing
AssigneeSnell Limited
InventorMichael James Knee
Life of this patent
Estimating the term…
Abstract
An adaptive low pass filtering process with a filter delay DA is conducted in parallel with reference low pass filtering process with a filter delay DR which is greater than DA. The error is measured between a delayed version of the adaptive process output and the reference process output. Filter parameters of the adaptive process are controlled to minimize the error.
Claims17
An apparatus for adaptive signal processing, the apparatus comprising:
- an input terminal for receiving an input signal;
- an output terminal;
- an adaptive filter connected to receive the input signal from the input terminal and configured to provide to said output terminal an adaptive filter output with a filter delay DA;
- a reference filter corresponding to the adaptive filter, connected to receive the input signal from the input terminal and configured to provide a reference filter output with a filter delay DR which is greater than DA;
- a delay unit for delaying the adaptive filter output by a delay corresponding to DR-DA;
- and an adaption unit configured to measure the error between the delayed adaptive filter output and the reference filter output and to adapt the adaptive filter in response to the error, wherein the adaptive filter and the reference filter are each linear filters, at least instantaneously.
3 more elements
A method of signal processing to transform an input signal in a signal processor to a processed signal, the method comprising:
- conducting an adaptive process on an input signal to form the processed signal, said adaptive process having controllable parameters;
- conducting in parallel a corresponding reference process on said input signal;
- measuring an error between a delayed version of the adaptive process output and the reference process output;
- and adapting the adaptive process by controlling said parameters to reduce said error, wherein the adaptive process and the reference process are each linear, at least instantaneously.
1 more element
A method of low pass filtering an input signal, the method comprising:
- conducting an adaptive low pass filtering process on an input, said process having controllable filter parameters and a filter delay DA;
- conducting in parallel a reference low pass filtering process on said input signal, said reference process having a filter delay DR which is greater than DA;
- measuring an error between a delayed version of the adaptive process output and the reference process output;
- and adapting the adaptive process by controlling said filter parameters to reduce said error.
1 more element
Dependencies are inferred from the claim text.