The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 24, 1990
Filed:
Dec. 15, 1987
Kornelis J Wouda, Hilversum, NL;
Simon J Tol, Hilversum, NL;
AT&T and Philips Telecommunications B.V., Hilversum, NL;
Abstract
An adaptive time-discrete filter having an impulse response h(i) with i=0,1,2, . . . for forming a cancelling signal from synchronous data symbols (for example to cancel echoes or lagging intersymbol interference) comprises a transversal filter section (12) having adjustable coefficients C.sub.i with i=0,1,2, . . . , N-1 for realizing the first N values h(i) of the impulse response as well as a recursive filter section (12') for realizing the values h(i) with i=N,N+1, . . . . The recursive filter section (12') receives the input signal delayed over N-1 discrete time intervals from the adaptive filter as an input signal x(n) and forms an output signal y(n) according to the relationship:
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