Adaptive modulation and data embedding in light for advanced lighting control

• US 20130069540A1
• Filed: 11/14/2012
• Published: 03/21/2013
• Est. Priority Date: 02/12/2008
• Status: Active Grant

• Current Assignee: Signify Holding B.V. (Signify N.V.)
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: SCHENK, Tim Corneel Wilhelmus, FERI, Lorenzo, YANG, Hongming
• Granted Patent: US 10,904,980 B2
• Time in Patent Office: Days
• US Class Current: 315/152
• CPC Class Codes: H05B 45/10 Controlling the intensity of the light
• CPC Class Codes: H05B 47/165 following a pre-assigned programmed sequence; Logic control [LC]
• CPC Class Codes: H05B 47/19 via wireless transmission

Abstract

Disclosed is a method for controlling a light output signal emitted by a set of light sources comprising at least one light source, wherein said light output signal includes a modulation signal which carries individual information, such that the method includes recurrently:

• • remotely detecting the light output signal of said set of light sources;
  • determining at least one quality measure of said remote detection of the light output signal; and
  • adjusting the modulation signal on basis of said at least one quality measure.

Claims

1. A method for controlling a light output signal emitted by a set of light sources comprising at least one light source, wherein said light output signal comprises a modulation signal which carries information related to the set of light sources, the method comprising recurrently:

remotely detecting the light output signal of said set of light sources;

determining at least one quality measure of said remotely detected light output signal; and

adjusting the modulation signal on basis of said at least one quality measure.

2. A method according to claim 1, wherein said step of determining at least one quality measure comprises:

estimating at least one performance parameter for the transmission link extending between the set of light sources and the position where the remote detection takes place; and

using said at least one performance parameter for said determining at least one quality measure.

3. A method according to claim 2, wherein said at least one quality measure comprise at least one of signal-to-noise ratio, signal amplitude of the detected light output signal, and noise level of the detected light output signal.

4. A method according to claim 1, wherein said step of adjusting the modulation signal comprises adjusting at least one of modulation depth, frequency, and intensity of the modulation signal.

5. A method according to claim 1, wherein said step of remotely detecting the light output signal comprises extracting said information from the light output signal;

and wherein said step of determining at least one quality measure comprises determining a quality measure of said extracted information.

6. A method according to claim 5, wherein said information is represented as at least one bit within each time period of the light output signal.