Signal classifier
US4227255A · kind A · utility
56Cited by
7References
27Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 11, 1979 |
| Grant date | Oct 7, 1980 |
| Priority date | — |
| Expiry date | Apr 11, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B14/002
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A signal classifier performs measurements on an IF signal and determines from these measurements the nature of the modulation, if any, appearing on a received high frequency communications signal. The classifier distinguishes between double sideband AM, single sideband suppressed carrier voice AM, ASK, FSK, multi-channel FSK, unmodulated carrier and noise. The measurements include AM variation, the zero crossing rate in detected AM, the percentage of time the detected AM signal level exceeds a given amplitude, and wide and narrow band detected FM.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.