Adaptive signal processing

摘要

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.

主权项

1. 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.