Method and apparatus for bit rate reduction
US4901075A · kind A · utility
69Cited by
4References
13Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 11, 1987 |
| Grant date | Feb 13, 1990 |
| Priority date | — |
| Expiry date | Sep 11, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M7/42
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for coding a signal for transmission in order to achieve improved reduction in the bit rate. A signal is a transform coded in order to form a sequence of zero coefficients and non-zero coefficients, and run lengths of zero coefficients together with preceding or subsequent non-zero coefficients are grouped as events and coded.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.