Video signal encoding with bit rate control
US5134476A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 30, 1990 |
| Grant date | Jul 28, 1992 |
| Priority date | — |
| Expiry date | Mar 30, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/146
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Individual frames in a video signal are encoded using different coding techniques such as intraframe, motion compensated prediction and motion compensated interpolation coding. The encoder output, which is produced at a first highly variable rate, is applied to a channel via a buffer that outputs the encoded signal at a second, less variable rate. The rate allocated to different frame types is determined as a function of the type of frame being encoded and the coding technique being used. A second buffer may be used to eliminate almost all variations in the rate at which data is applied to the channel. Buffer fullness may control characteristics of the encoder such as quantizer step size and/or prefiltering.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.