Video quality adaptive variable-rate buffering method and system for stabilizing a sampled video signal
US7471340B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 24, 2005 |
| Grant date | Dec 30, 2008 |
| Priority date | — |
| Expiry date | Feb 15, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/8042
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A video quality adaptive variable-rate buffering method and system for stabilizing a sampled video signal reduces the buffer size required to compensate for line-to-line variations in an unstable video source. A video signal is sampled at a predetermined rate and decimated by a selectable decimation factor prior to buffering. By selecting different decimation factors, the effective length of the buffer is changed from short duration for stable input signals and to longer duration for unstable input signals. A video signal quality detector is employed to provide a selection input that adjusts the decimation factor and also the loop bandwidth of a clock generator that provides the output clock for the buffer, which is generated from the input signal via a phase-lock loop (PLL). The operation of the system automatically varies from highly responsive for stable video input signals to less responsive for unstable video input signals, providing improved stability in the video output.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.