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:
May. 21, 2002
Filed:
Jun. 25, 1999
John Anderson Fergus Ross, Saratoga Springs, NY (US);
Nick Andrew Van Stralen, Clifton Park, NY (US);
Mark Lewis Grabb, Burnt Hills, NY (US);
Steven Robert Koch, Niskayuna, NY (US);
Richard Louis Zinser, Jr., Niskayuna, NY (US);
John Bailey Anderson, Södergatan, SE;
Lockheed Martin Corporation, Bethesda, MD (US);
Abstract
A method for decoding (voice)data where the data is encoded by a finite-state data encoder ( ) for transmission over a data channel ( ), includes the step of procuring a table of joint statistics representing the probability of occurrence, in a frame of source data of each of the bits of the frame. The joint statistics may be determined ahead of time. The method includes the step of calculating intermediate gamma signals in response to the decoded data of the preceding frame and the joint statistics. The joint statistics source distribution signals represent the likelihood that, for a given logic level of the preceding bit, the “current” bit takes on a particular state; for uncorrelated bits, this value is 0.5. State probability signals and transition probability signals are generated from the gamma signals. The state probability and transition probability signals are processed to produce bit probability signals indicative of the probability that the current bit is in a given state, from which hard bit decisions can be made.