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:
Sep. 15, 1981
Filed:
Dec. 22, 1978
Dale M Walsh, West Redding, CT (US);
General DataComm Industries, Inc., Danbury, CT (US);
Abstract
Portions of an adaptive equalizer can be used for exact preamble synchronization by modifying the digital filter section to recognize pre-determined sequences of signals in the received signal. This may be accomplished by applying to the modifying means of the digital filter input signals which are proportional to the complex conjugate of the signals in the received signal. When the signals in the tapped delay line are aligned with this complex conjugate, the output of the summing means will be discernibly greater than otherwise. As a result, a threshold device can be used to recognize the exact baud time the preselected signals in the received signal are contained in the tapped delay line.