Detection of a digitally modulated signal using binary line enhancement
US5455846A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 17, 1993 |
| Grant date | Oct 3, 1995 |
| Priority date | — |
| Expiry date | Nov 17, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L7/027
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Detection of a digitally modulated radio signal whose underlying data contain repetition structures is achieved by generating a binary spectrum from the frequency domain spectral amplitudes. The binary spectrum of the signal can be rastered at the signal's framing rate or other periodicity to create a two dimensional matrix with the set periodic bits falling along column of the matrix. Application of non-linear logical filtering operations removes speckle caused by aperiodic bits while maintaining the run of aligned periodic bits along the column of the matrix. To automate the line detection process, statistical values and measured line lengths in the binary matrix are used to adjust processing parameter values.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.