The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 17, 2018
Filed:
Mar. 03, 2014
Philips Lighting Holding B.v., Eindhoven, NL;
Ronald Rietman, Eindhoven, NL;
Stephanus Joseph Johannes Nijssen, Eindhoven, NL;
PHILIPS LIGHTING HOLDING B.V., Eindhoven, NL;
Abstract
The invention provides a communication system (), 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 () for generating a light driving signal () being a frequency shift key modulated signal comprising a sequence of signal parts (), 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 (T) and the signal parts modulated at the second frequency having second pulses in second periods (T). 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.