Method for encoding data
US6218968A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 24, 1997 |
| Grant date | Apr 17, 2001 |
| Priority date | — |
| Expiry date | Dec 24, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M7/40
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The invention relates to a method for encoding an analogue signal having an amplitude with a non-uniform probability density. The method includes quantising the signal as falling within one of plural signal level ranges, and coding the quantised signal by assigning codewords to the quantising levels so as to generate a binary coded message. Each codeword has plural binary-valued digits. The codewords are assigned to the quantising levels in accordance with the occurrence probability of the quantising levels and the number of bits having a first value in the codeword such that quantisation levels of higher occurrence probability are assigned codewords with fewer bits having a first value than those assigned to quantisation levels of lower occurrence probability. The coding includes generating the binary coded message such that the number of bits in the coded message is minimized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.