Patent Document ID: 5426597
Application ID: 08233562
Patent Flag: 1

Claim One:
1. An adaptive filter system for use in connection with a reference system, the reference system receiving an input u(s) and generating in response thereto a reference output y(s) defined by a reference transfer function H(s)=c(sI-A).sup.-1 b+d, where "I" is the identity matrix and matrix A, vectors b and c, and scalar d are reference parameters, and "s" is a variable for the input, the adaptive filter system comprising: a system model module for receiving the input and generating in response thereto and in response to a plurality of model parameters matrix A', vectors b' and c', and scalar d, an intermediate model output vector x'(s)=u(s)I-A' and a model output y'(s)=cx'(s)b+d; a gradient filter module for receiving the intermediate model output vector x' (s) and generating a gradient output vector w(s)=.intg.x'(s)+A'w(s)ds; an adjustable parameter module for receiving the gradient output vector w(s) from the gradient filter module, x'(s) from the system model module and input u(s) and generating dot products with respective adjustable parameters .alpha., .beta. and .delta. to generate a model adjustment value v'(s); and a parameter adjustment module for generating adjusted parameters for use by the adjustable parameter module in response to current values of adjustable parameters and an error value e(s)=y(s)-[y'(s)+v'(s)].