Method and circuit for signal transmission via a current loop
US8885760B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 23, 2010 |
| Grant date | Nov 11, 2014 |
| Priority date | — |
| Expiry date | Sep 3, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L12/40013
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A method for signal transmission between a first and a second system; wherein the first and the second system are connected with one another via a current loop. A direct current signal is transmitted in a first frequency range and an alternating current signal in a second frequency range via the current loop. The direct current signal and the alternating current signal are superimposed and the alternating current signal is used for digital signal transmission and the direct current signal is used for analog signal transmission. By means of a control unit, a first data stream is produced, in which the direct current signal and alternating current signal to be set in the current loop are digitally encrypted. The first data stream is transmitted to an electrical current output circuit and the transmitted first data stream is converted by the electrical current output circuit into an electrical current signal. The electrical current signal is composed of the superimposed direct current signal and alternating current signal, or the transmitted first data stream is converted by the electrical current output circuit into the direct current signal and the alternating current signal. The el…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.