Pre-emphasis network with variable time delay
US5726606A · kind A · utility
15Cited by
4References
18Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 17, 1996 |
| Grant date | Mar 10, 1998 |
| Priority date | — |
| Expiry date | Jul 17, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G5/28
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A pre-emphasis network used in a television signal jamming encoder has a variable gain tuned amplifier first stage and an attenuable notch filter and variable gain broadband amplifier second stage. The notch filter is tuned to a center frequency above the television signal intermediate frequency's visual carrier frequency resulting in 15 dB of increased pre-emphasis and a time delay which compensates for a time delay imparted by a decoding network upon decoding of a signal jammed by this encoder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.