Telecontrol message transmission system
US4197499A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 4, 1978 |
| Grant date | Apr 8, 1980 |
| Priority date | — |
| Expiry date | Dec 4, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B15/04
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A telecontrol order transmission system having at the transmitting end a source, for generating ergodic random signals x(t), a circuit for alternately delivering the sum and the difference of signals x(t) and x(t-T.sub.1), which circuit is switched at the rate of a frequency f.sub.c and, at the receiving end, a multiplier multiplies a received signal by said received signal delayed by time lapse T.sub.i, an integrator for time averaging the output of said multiplier, a band-pass filter with a narrow bandwidth centered about frequency f.sub.c, connected to the output of said integrator, and a circuit for deriving a telecontrol order from the output of said filter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.