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:
Jun. 08, 1982
Filed:
Sep. 08, 1980
Richard D Gitlin, Monmouth Beach, NJ (US);
Howard C Meadors, Jr, Ocean, NJ (US);
Bell Telephone Laboratories, Incorporated, Murray Hill, NJ (US);
Abstract
In a first data receiver (10), sampling circuitry (20, 25, 35) forms samples of a received data signal representing a succession of data symbols. The samples are formed at twice the symbol rate. Transversal filter circuitry (251, 261) operates on the samples by multiplying them by respective ones of a queue of coefficients. Further circuitry (55, 60, 65, 70, 252, 262), operative in response to the resulting products, forms decisions as to the values of the transmitted symbols and updates the values of the coefficients. Timing recovery circuitry (40) periodically identifies the largest of the coefficients in magnitude and either advances or retards the operation of the sampling circuitry by a fixed step size depending on whether that coefficient is or is not within a predetermined portion of the queue. Timing recovery circuitry (830) within a second data receiver (100) operates in a similar manner, but employs a step size whose magnitude is determined by the position of the largest coefficient relative to the center of the coefficient queue.