Method for detecting leakage in digitally modulated systems
US9160407B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 26, 2012 |
| Grant date | Oct 13, 2015 |
| Priority date | — |
| Expiry date | Jun 26, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N17/004
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a method for detecting leakage in a digital cable system, at least one first signal is inserted on the cable system. The at least one first signal has an amplitude multiple tens of dB below the digital channel power of the digital channels carried on the cable system. A second signal containing the first signal is received. The second signal is converted to an intermediate frequency (IF) signal. The IF signal is digitized and samples of the digitized IF signal are obtained. Digitized samples of a third signal at the nominal frequency of the first signal at maximum amplitude converted to the IF are provided. The digitized IF signal and the digitized samples of a third signal at the nominal frequency of the first signal at maximum amplitude converted to the IF are correlated. The presence of the inserted first signal is detected based upon the result of the correlation. In another method, a pair of first signals are inserted on the cable system. The pair of first signals are spaced apart a fixed frequency and with amplitudes multiple tens of dB below the digital channel power of the digital channels carried on the cable system. A second signal containing the first signal is receiv…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.