Noise reducing system
US4296436A · kind A · utility
Assignees
Inventor
Key dates
| Filing date | Aug 21, 1979 |
| Grant date | Oct 20, 1981 |
| Priority date | — |
| Expiry date | Aug 21, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/21
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A noise reducer wherein, depending upon the magnitude of a difference signal between an input television signal at the present time and a television signal recorded in a frame memory and with noise reduced, the mixing ratio between the present-time input signal and the television signal obtained from the frame memory is varied, and a part of the mixed signal is applied to the frame memory while the other part is used as a television signal with noise reduced; a noise reducing system wherein, in order to make the reduction of noise possible even for a moving object, a movement of a picture in one frame time is detected, the output of the frame memory is compensated for with the movement, and depending upon the magnitude of a difference signal between the present-time input television signal and the movement compensated output signal of the frame memory, the mixing ratio between the present-time input television signal and the compensated output signal of the frame memory is varied.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.