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:
Jul. 12, 1977
Filed:
Mar. 01, 1976
Applicant:
Inventors:
Chin Long Chen, Wappingers Falls, NY (US);
Robert A Rutledge, Poughkeepsie, NY (US);
Assignee:
IBM Corporation, Armonk, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G06F / ;
U.S. Cl.
CPC ...
3401 / ; 325 41 ;
Abstract
This specification describes a convolutional code and apparatus for the correction of errors in differentially encoded quadrature phase shift keyed data (DQPSK). In each sequence of forty bits 24 are information bits and the remainder are parity bits. Two parity bits are generated for each three information bit set in the sequence in accordance with the following equations: