Upward-joining-noise decreasing method and apparatus
US6728968B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 9, 2000 |
| Grant date | Apr 27, 2004 |
| Priority date | — |
| Expiry date | Mar 9, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N7/17309
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for decreasing upward-joining-noise in an upward-signal-inputting position of a center device includes the steps of: measuring a noise level of each of a plurality of upward signals supplied from a plurality of transmission lines; determining whether the measured noise level of each upward signal is low enough or not; and based on a determination result, controlling and adjusting a level of each upward signal. Therefore, the level of an upward signal, for which the noise level of the upward signal is determined to be low enough, is adjusted higher but still kept at a level low enough not to interfere with upward signals from other transmission lines.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.