Processing of digital signals
US4425588A · kind A · utility
Inventor
Key dates
| Filing date | Jan 30, 1981 |
| Grant date | Jan 10, 1984 |
| Priority date | — |
| Expiry date | Jan 30, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B20/10527
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Apparatus is disclosed for use in a digital signal transmission or recording system, particularly for video signals where, as is customary, the number of digital signals (i.e., digital words) is reduced (for example, by a factor of 2) prior to transmission or recording. The apparatus is operable to determine when a digital word fed to an input filter has a characteristic similar to that of a filtered word so that such a word can bypass the input filter and be transmitted or recorded without further filtering. This is achieved by monitoring the words input to the input filter and then operating a bypass around the input filter when the monitoring circuit detects that an input word has a characteristic similar to a filtered word.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.