Mass transit inductive data communication system
US5574441A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 2, 1993 |
| Grant date | Nov 12, 1996 |
| Priority date | — |
| Expiry date | Jul 2, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08C17/04
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A transmitter circuit and a receiver circuit couple inductively to allow data communication between a mass transit vehicle farebox and an external computer. Data communication may be performed simultaneously with removal of coins from the farebox via a vacuum hose. Two mating connectors each carry a wire coil; one coil is connected to the transmitter circuit and the other is connected to the receiver circuit. Furthermore, the same connectors that carry the coils may be used to form the vacuum hose connection. A modulated signal representing encoded binary data is applied to the transmitter coil to cause corresponding flux changes. When placed in close proximity to one another, the magnetic flux changes across the gap induce a corresponding modulated signal in the receiver coil. The induced signal in the receiver coil is then decoded to recover the original binary data. The coils thus function as halves of a transformer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.