ATV television system with reduced co-channel NTSC interference
US5291291A · kind A · utility
4Cited by
4References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 8, 1992 |
| Grant date | Mar 1, 1994 |
| Priority date | — |
| Expiry date | Apr 8, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/646
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A system for minimizing co-channel interference into NTSC receivers from digitally transmitted ATV signals. The NTSC receiver subjective random noise sensitivity characteristic is utilized to shape the ATV transmitter power curve. A complementary filter incorporated in ATV receivers for compensating for the shaped ATV transmitter power curve. The shaped ATV power curve emphasizes signals at the frequencies where the NTSC subjective random noise sensitivity is low and deemphasizes signals at the frequencies where the NTSC subjective sensitivity is high.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.