Adaptively controlled noise reduction device for producing a continuous output
US5325203A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 14, 1993 |
| Grant date | Jun 28, 1994 |
| Priority date | — |
| Expiry date | Apr 14, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/144
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An adaptively controlled noise reduction device in which an input video signal is supplied to first, second, and third adders and in which an output of the first adder is supplied to the second adder via a memory responsive to a controller whereby the memory provides a controllable delay. An output of the second adder is supplied via a first coefficient multiplication unit having variable attenuation that is controlled by the controller to the first adder as well as via a second coefficient multiplication unit having variable attenuation that is controlled by the controller to the third adder. A change-over switch responsive to the controller outputs either a signal from the third adder or from the memory. Therefore, a signal is output even during the delay period produced by the memory when the signal is delayed between the first and second adders.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.