Communication system, lighting system and method of transmitting information
US10027409B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 3, 2014 |
| Grant date | Jul 17, 2018 |
| Priority date | — |
| Expiry date | Mar 9, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/5563
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The invention provides a communication system (500), a lighting system, a method of transmitting information and a computer program product. The communication system according to the invention is configured for transmitting data via visible light. The communication system comprises a signal generator (530) for generating a light driving signal (200) being a frequency shift key modulated signal comprising a sequence of signal parts (215, 225), each signal part being modulated at a first or second frequency in accordance with the data, the signal parts modulated at the first frequency having first pulses in first periods (T0) and the signal parts modulated at the second frequency having second pulses in second periods (T1). Energy of the visible light corresponding to a pulse in a respective period has center of gravity in time. The pulses in the periods are positioned so that the center of gravity is at the center of the period for reducing human-perceivable frequency components in the visible light driving signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.