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:
Aug. 23, 2005
Filed:
Mar. 19, 2001
Applicant:
Claymens Lee, Kaohsiung Hsien, TW;
Inventor:
Claymens Lee, Kaohsiung Hsien, TW;
Assignee:
Topic Semiconductor Corp., Hsinchu, TW;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04M009/08 ; H04B003/20 ;
U.S. Cl.
CPC ...
Abstract
An apparatus of a digital echo canceller comprises a first-set delay circuits, a selector, a second-set delay circuits, a plurality of multipliers and an adder. The first-set delay circuits are arranged into groups, and each group has N delay circuits. An exhaustive search function is carried out to produce a plurality of energy sums. The selector will select the biggest energy sum to serve as a significant part and then transmit to the outputs of the second-set delay circuits, the multipliers and the adder. An estimated echo signal is produced to cancel the echo signal.