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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.:

US 4528676 B1

PDFFull Text
Date of Patent:
Jul. 09, 1985

Filed:

Jun. 14, 1982

Echo cancellation circuit using stored, derived error map

Applicant:
Inventors:

Gordon F Mein, Ottawa, CA;

John B Terry, Carp, CA;

Gregory F Hicks, Smiths Falls, CA;

Assignee:

Northern Telecom Limited, Montreal, CA;

Attorney:

Moorhouse; J. E.

Primary Examiner:

Robert L Griffin

Assistant Examiner:

Raymond C Glenny

Int. Cl.
CPC ...
H04B / ;
U.S. Cl.
CPC ...
375 14 ; 375 13 ; 375 20 ; 375101 ; 328165 ; 332 / ; 333 18 ;
Abstract

An automatic correction circuit is responsive to suitable bit patterns in a bit stream being received from a transmission medium, to generate an error amplitude map of signal distortion being introduced by the transmission medium. The error amplitude map is digitally stored or recorded. After each non zero bit occurrence in the signal stream a synchronized output signal corresponding to the recorded error amplitude map is generated and added to the bit stream being received to reduce signal distortion, whereby information recovery from the received bit stream is improved.

Find Patent Forward Citations

Mein, Gordon. (1985). Echo cancellation circuit using stored, derived error map (U.S. Patent No. 4528676). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4528676

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

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