Dynamic noise reduction for video
US4658296A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 30, 1984 |
| Grant date | Apr 14, 1987 |
| Priority date | — |
| Expiry date | Oct 30, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N11/24
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a system in which an information signal is transmitted along with digital data from a transmitter to a receiver, transmitter circuitry is provided which produces digital data indicative of parameters relating to noise reduction for the information signal, and receiver circuitry is provided responsive to the digital data so as to optimize reception of the information signal. In one embodiment of the invention, one of a plurality of different pre-emphasis levels is applied to a signal and digital data is produced according to a value of pre-emphasis added. The digital data and the pre-emphasized signal are then transmitted. The receiver decodes the digital data and adds a corresponding amount of de-emphasis to the received information signal. In another embodiment the digital data indicates an optimum value for a parameter to be applied to a threshold extension demodulator in the receiver.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.