Level regulator governed by a pilot tone
US4158113A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 29, 1978 |
| Grant date | Jun 12, 1979 |
| Priority date | — |
| Expiry date | Jun 29, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B3/10
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The invention relates to transmission systems and in particular to level regulators controlled by a pilot tone and used in such systems to correct variations over a period of time in the attenuation of the transmission system. The subject of the invention is a level regulator governed by a pilot tone whose gain control circuit locks in a mean position where there is a very low or zero value detected for the pilot tone. This locking is achieved by modifying the supply voltage of the error amplifier of the loop providing automatic gain control for the regulator. The invention is of particular application to cable transmission systems with repeaters.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.