Multi-channel signal decoder
US4015082A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 13, 1975 |
| Grant date | Mar 29, 1977 |
| Priority date | — |
| Expiry date | Mar 13, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/148
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A signal decoder is disclosed for use in a transportation vehicle control system in which vehicle control signal information bits are transmitted according to a multiple message frequency, FM, PSK, or FSK, comma-free binary coded command signal. The disclosed invention uses selective receiver channels for each command signal message frequency to detect information bits according to the selected message frequency. The detected information bits of each receiver channel are separately stored to comprise a separate information history for each message frequency and these information bit histories are then individually decoded. The decoded signals are compared to detect a discrepancy between any of the decoded signals due to component failures, signalling system noise, or component transient conditions. For any discrepancy between the decoded signals, a fail-safe comparator reduces the decoded signal to a more safe condition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.