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:
Jul. 03, 2001
Filed:
Aug. 30, 1999
John D. Leighton, Anoka, MN (US);
Sally A. Doherty, Afton, MN (US);
Agere Systems Guardian Corp., Miami Lakes, FL (US);
Abstract
Echo cancellation is provided in a disk drive circuit having a transducing head connected to a preamplifier circuit by an electrical interconnect with a first time delay, a first interface between the preamplifier and the electrical interconnect having a first reflection coefficient and a second interface between the transducing head and the electrical interconnect having a second reflection coefficient. The echo cancellation technique delays a preamplifier output signal with a second time delay, the second time delay being double the first time delay. The preamplifier output signal is also filtered so as to simulate the effects of the first and second reflection coefficients. The delayed and filtered signal is then subtracted from the preamplifier output signal, thereby removing echo content from the signal.