Signal independent pulse code modulation data enhancer and associated method
US5515387A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 12, 1994 |
| Grant date | May 7, 1996 |
| Priority date | — |
| Expiry date | Dec 12, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/03178
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A pulse code modulation (PCM) data enhancer which corrects bit errors using correlations between two particular PCM words received by a receiving unit separated by a predetermined time interval and a method therefor. A primary and a number of secondary pulse codes are stored in a first-in-first-out (FIFO) memory. The primary pulse code is modified, and the modified and secondary pulse codes provide addresses to a memory storing the probability of a transition between the modified pulse code and each of the secondary pulse codes. The probabilities are then accumulated, and the modified pulse code resulting in the greatest accumulated probability is output as an error-corrected data word.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.