Data compression for use with a communications channel
US5955976A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 2, 1997 |
| Grant date | Sep 21, 1999 |
| Priority date | — |
| Expiry date | Dec 2, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M7/46
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A method of compressing data involves receiving a symbol, and a subsequent symbol; determining in a compression dictionary whether the symbol has a valid extension pointer; using, in the event the symbol does have a valid extension pointer, the valid extension pointer to access string extension symbols; determining, in the event the symbol does have a valid extension pointer, whether the string extension symbols equal the at least one subsequent symbol; determining in the compression dictionary, in the event the string extension symbols do not equal the at least one subsequent symbol, whether the symbol has a valid parallel extension; repeating, in the event the symbol has a valid parallel extension, the using step; repeating, in the event the string extension symbols do not equal the at least one subsequent symbol, the determining of whether the symbol has a valid extension pointer; inserting, in the event the symbol does not have a valid extension pointer or in the event the symbol does not have a valid parallel extension, a code word indicative of a longest string found into a compressed data stream; determining whether the longest string was a single symbol; extending, in the e…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.