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:
Feb. 18, 2003
Filed:
Nov. 25, 1998
Applicant:
Inventors:
Clive Russell Irving, Chesterton, Cambridge CB4 1RP, GB;
David John Spreadbury, Harston, Cambridgeshire CB2 5PR, GB;
Colin Richard Smithers, Bishop's Stortford, Hertfordshire CM23 2HX, GB;
Timothy Charles Mace, Haverhill, Suffolk CB9 0ED, GB;
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04L 2/710 ;
U.S. Cl.
CPC ...
H04L 2/710 ;
Abstract
A method and apparatus for transmitting and receiving data, wherein a narrow band data signal is transmitted at an unknown frequency within a known range of frequencies and received, and, at the receiver, the range of frequencies is divided into plural frequency bands each of width less than the uncertainty in the transmission frequency of the data signal, with the presence of said data signal detected in at least one of said frequency bands and thereupon demodulated.