Detection of EFM stream component widths
US6658068B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 15, 1999 |
| Grant date | Dec 2, 2003 |
| Priority date | — |
| Expiry date | Oct 15, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K5/19
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Method and system for determining varying widths of each of a sequence of signal components (marks and spaces) in an incoming digital signal stream and for indicating which mark widths and which space widths fall outside acceptable ranges. A pre-mark and pre-space are added to the front end of the recieved stream for alignment purposes. The width of each signal component (mark or space) is determined and compared with an acceptable range of mark widths or space widths. Each mark or space that lies outside an acceptable range has an indicium associated with this mark or space, indicating this non-compliance. The modified digital signal stream, including the indicia, is re-issued after a selected time delay for subsequent signal processing. A method for measurement or estimation of mark width and space width is presented.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.