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:
Dec. 18, 1984
Filed:
Apr. 18, 1983
James E Mazo, Fair Haven, NJ (US);
AT&T Bell Laboratories, Murray Hill, NJ (US);
Abstract
A stream of data to be transmitted is arranged in n streams of 2-bit words. Successive pairs of bits in each of those streams are differentially encoded by generating for each different combination of their values a predetermined one of the differentially encoded bit pairs (i,q), (q,i), (i,q) and (q,i) associated with that combination, where (i,q) is the previously generated differentially encoded bit pair. Words each comprised of the first (second) bit of a respective bit pair in each of the resulting n differentially encoded streams are then provided as n-bit words in a first (second) input stream for a two-dimensional channel coder. In the receiver, the channel decoder provides first and second streams of n-bit words. The bits of the latter are then arranged such that each word in the first (second) stream of channel-decoded words becomes the first (second) bit of a differentially encoded bit pair in a respective one of n differentially encoded bit pair streams. The pairs of bits in each of the n differentially encoded streams are then differentially decoded to recover the original data.