Downstream output level and/or output level tilt compensation device between CATV distribution system and CATV user
US8001579B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 16, 2008 |
| Grant date | Aug 16, 2011 |
| Priority date | — |
| Expiry date | Feb 12, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/6118
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A downstream bandwidth output level and/or output level tilt compensation device that can be inserted into a signal transmission line of a CATV system on a premise of a user. The device includes a tuner that identifies low and high band signal channels, and a channel analyzer that determines a format of each of those channels. A signal measurement measures low and high band signal strengths. An offset circuit adds or subtracts an offset value to the low and/or high band channel signal strengths depending on whether the respective channel is analog or digital. A microprocessor compares the low and high band signal strengths, including any offset values, to a predetermined signal strength loss curve. A variable output level compensation device and a variable slope adjusting circuit are provided to amplify and adjust the gain slope of the downstream bandwidth.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.