Radio frequency leakage detection system for CATV system
US5608428A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 9, 1994 |
| Grant date | Mar 4, 1997 |
| Priority date | — |
| Expiry date | Jun 9, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04H20/78
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A communication circuit comprises a plurality of sources of program material, and a plurality of modulators for supplying a plurality of carrier frequency signals. Each modulator is modulated by a respective one of the sources of program material. Each of the program material sources is coupled to a respective modulator. The program material-modulated carrier frequencies are coupled in the circuit. Terminal apparatus is provided for demodulating at least one of the program material-modulated carrier frequency signals. The terminal apparatus includes automatic gain control (AGC) circuitry having an AGC bandwidth. The terminal apparatus is coupled to the circuit. One of the program material-modulated carrier frequencies is coupled in the circuit through a variable attenuator having an attenuator control signal input, a program material-modulated carrier frequency input, and a variably attenuated program material-modulated carrier frequency output. An oscillator generates at an oscillator output a signal having a frequency within the AGC bandwidth. Said one of the program material modulated carrier frequencies is coupled to the program material-modulated carrier frequency input. The o…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.