Method and means for variable length coding
US4922510A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 17, 1988 |
| Grant date | May 1, 1990 |
| Priority date | — |
| Expiry date | Feb 17, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M7/42
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A method and a device are disclosed for variable length coding and decoding of an information block of input signals, with the information being concentrated at the beginning of the block and the block being terminated by a continuous succession of zero words. Two code trees are utilized for coding and decoding the block. The first of the code trees is utilized for coding and decoding the first part of the block up to and including the word before the last non-zero and an end of the block character EOB, and the second code tree is specially designed for coding and decoding the last non-zero word. A switching device provides for switching between the two code trees and associated devices after the character EOB and before the last non-zero word.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.