Apparatus including an improved device for recovering the d.c. component
US5036388A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 3, 1989 |
| Grant date | Jul 30, 1991 |
| Priority date | — |
| Expiry date | Nov 3, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N7/083
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The apparatus performs a processing operation on the signal in a transmission system, this signal conveying analog luminance and chrominance information components associated with periods of the coded digital signal. A receiver in a MAC television system is, for example, such a device. The device for recovering the d.c. component includes encoding member (4) which, from the decoded digital signal, realizes an encoding operation of the type used for the creation of the received signal, an estimation circuit for the d.c. component (6) calculating the estimation from the difference between the received coded signal and the recovered coded signal by the encoding member, this estimation constituting d.c. component correction signal, and a subtraction circuit (9) which, from the digital signal received, subtracts the d.c. component correction signal throughout the duration of a line. The apparatus also includes, downstream of the device (6) which supplies the d.c. component correction signal, a filter (8) which utilizes d.c. component correction signals of several line scanning periods simultaneously to improve the d.c. component correction signal, which is of the finite-impulse-response…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.