Signal to noise ratio measurement by sampling noise outside carrier frequency
US4721997A · kind A · utility
5Cited by
3References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 2, 1986 |
| Grant date | Jan 26, 1988 |
| Priority date | — |
| Expiry date | Jun 2, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N17/02
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The signal-to-noise ratio of the video portion of a television signal is measured by measuring the noise level in a 200 KHz band spaced 2 MHz from the video carrier during the vertical sync period and the carrier level is also measured during the vertical sync period. The two measurement signals are sequentially applied to a microprocessor which calculates the signal-to-noise ratio from the two measurements and drives a meter which displays the signal-to-noise ratio in decibels.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.