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. 20, 1995
Filed:
Feb. 18, 1993
Johannes W Bergmans, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
A data transmission system wherein the data symbols to be transmitted are divided into two groups, for example odd and even, and each data symbol in one group is represented by a signal element which differs from the signal element used to represent each data symbol in the other group. An example of such encoding is the quadra-phase code. The transmitted signal is a summation of the signal elements of both groups. At the receiver the received signal is sampled at a first and a second sampling instant for every two successive signal elements, and from the sample values decisions are made as to the symbol values represented thereby. This requires that the sampling instants accurately correspond to the two groups of signal elements. To achieve such timing control the receiver includes a phase detector for deriving an error signal representing deviation between actual and correct sampling instants, and the actual sampling instants are adapted to minimize the error signal. The error signal is based on a correlation between the values of samples at the sampling instants and expected values thereof at such instants.