INFO 1 detection
US4771264A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 28, 1986 |
| Grant date | Sep 13, 1988 |
| Priority date | — |
| Expiry date | Jul 28, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K5/19
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Method of detecting the INFO 1 signal pattern which avoids false activation of a data transmission line caused by noise on the line. An initial line sampling rate four times the nominal 192 kbs line rate is used to detect a HIGH mark to avoid the difficulties resulting from sampling right at the edge of a mark. Subsequent sampling is done at the nominal line rate to detect two opposite polarity marks out of every consecutive eight-bit time periods. If six consecutive eight-bit time periods are detected, each having its HIGH and LOW marks in the same relative positions, the line is activated. The method is readily implemented as a set of three "state machines" and consequently can be constructed from programmable logic arrays.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.