Multichannel video data storage including buffers for reading data at fast rates and supplying data at slower rates
US5543861A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Mar 9, 1995 |
| Grant date | Aug 6, 1996 |
| Priority date | — |
| Expiry date | Mar 9, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/9261
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A storage mechanism utilizing a single data recorder from which multiple channels of compressed video data may be simultaneously accessed. The data access to and from the data recorder via a single data access path takes place at a higher data rate (f.sub.1, f.sub.2) than the data rate (f.sub.3, f.sub.4) at which that compressed data needs to be decoded to support a video signal. A video router is used to direct the reproduced data stored within two data channel buffers to respective JPEG decoders where they are decompressed into a signal suitable for driving two digital monitors. In operation, a segment of compressed video data for one channel is recovered from the data recorder and stored within one of the buffers from which it is continuously read at a lower data rate (f.sub.3, f.sub.4). The data recorder then cues to another part of the medium from which data for the second channel is reproduced and stored within another buffer. The process is then repeated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.