Composite shift keying communication system
US4577333A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 13, 1984 |
| Grant date | Mar 18, 1986 |
| Priority date | — |
| Expiry date | Sep 13, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B2203/5495
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A Composite Shift Keying (CSK) modulation technique is described which provides enhanced error detection capability in a noisy transmission medium, such as an AC power line. A modulating binary signal causes the generation of two of three possible transmitted signals, and when the modulating binary signal is idle, no signal is transmitted. When the modulating signal is active, a single frequency qualifying signal (of radian frequency Wqt) is transmitted. If the active binary signal is a logical 0, an additional single frequency (of radian frequency W0) is transmitted along with Wqt. If the active binary signal is a logical 1, a different single frequency (of radian frequency W1) is transmitted with Wqt.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.