公开(公告)号：US09900092B2

公开(公告)日：2018-02-20

申请号：US14907284

申请日：2014-07-16

Applicant: PHILIPS LIGHTING HOLDING B.V.

Inventor： Frederik Jan De Bruijn ,  Stephanus Joseph Johannes Nijssen

IPC: H04B10/00 ,  H04B10/116 ,  H04B10/114 ,  H05B37/02 ,  H04B10/516

CPC classification number: H04B10/116 ,  H04B10/1149 ,  H04B10/516 ,  H05B37/0272

Abstract: A coded light component is modulated into emitted light on one of multiple channels each having a different modulation frequency. Modulation in the light causes a receiving camera to experience an apparent temporal frequency due to sequential capture of multiple frames and an apparent spatial frequency due to sequential exposure of spatial portions within each frame. Each channel can be detected by a detection module of the camera based on a respective combination of values of the apparent temporal and spatial frequency corresponding to the respective modulation frequency. The detection module has a respective response on each channel that varies as a function of the apparent temporal frequency. The channel for modulating the coded light component is selected from amongst a predetermined set having a property that the response of the detection module on each channel will have a minimum substantially at the apparent temporal frequency of each other channel.

公开(公告)号：US10128944B2

公开(公告)日：2018-11-13

申请号：US14893662

申请日：2014-05-23

Applicant: PHILIPS LIGHTING HOLDING B.V.

Inventor： Stephanus Joseph Johannes Nijssen ,  Frederik Jan De Bruijn ,  Tommaso Gritti

IPC: G06K9/46 ,  G06K9/66 ,  H04B10/116 ,  H04N5/235 ,  G03B7/093 ,  H04N5/232 ,  H04N5/353 ,  G03B7/08

Abstract: A device comprising an input for receiving image data representing light captured by a camera, and an image analysis module for detecting a coded light component modulated into the light with a modulation frequency. The camera has an exposure time, and the light is captured over a sequence of exposures each lasting for an instance of the exposure time. The detection performed by the image analysis module experiences a frequency blind spot in said detection due to an effect of said exposure time. To address this issue, the device further comprises an output for controlling one or more parameters of the camera which affect the exposure time, and a controller configured to control the one or more parameters to avoid that the modulation frequency corresponds to the frequency blind spot.

公开(公告)号：US09766120B2

公开(公告)日：2017-09-19

申请号：US14907702

申请日：2014-07-17

Applicant: PHILIPS LIGHTING HOLDING B.V.

Inventor： Frederik Jan De Bruijn ,  Onno Martin Janssen ,  Lorenzo Feri ,  Tommaso Gritti ,  Stephanus Joseph Johannes Nijssen

IPC: G01J1/02 ,  G01J1/44 ,  H04R1/10 ,  H04R23/00 ,  H05B37/02

CPC classification number: G01J1/0238 ,  G01J1/44 ,  H04R1/1033 ,  H04R23/008 ,  H05B37/0272

Abstract: The present invention relates to a mobile device for detecting light. The mobile device (300) includes a photo detector (320) which is arranged at the end of a socket barrel (114) of an audio jack socket in the mobile device. The socket barrel serves to collimate the light onto the photo detector.

公开(公告)号：US10027409B2

公开(公告)日：2018-07-17

申请号：US14774940

申请日：2014-03-03

Applicant: PHILIPS LIGHTING HOLDING B.V.

Inventor： Ronald Rietman ,  Stephanus Joseph Johannes Nijssen

IPC: H04B10/00 ,  H04B10/04 ,  H04B10/12 ,  H04B10/116 ,  H04B10/556

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.

公开(公告)号：US09980332B2

公开(公告)日：2018-05-22

申请号：US15118984

申请日：2015-01-30

Applicant: PHILIPS LIGHTING HOLDING B.V.

Inventor： Constant Paul Marie Jozef Baggen ,  Stephanus Joseph Johannes Nijssen

IPC: H05B37/02 ,  H05B33/08 ,  H03K7/08

CPC classification number: H05B33/0845 ,  H03K7/08 ,  H05B33/0815 ,  H05B33/0818

Abstract: A circuit comprising a controller (2) for controlling a pulse width modulated input signal, and a driver (4) configured to supply current to a load (6) based on the input signal, wherein over the on time of each pulse width modulation period the driver (4) supplies current to the load (6) with a second frequency that is greater than the first frequency. The controller (2) is configured to control the duty cycle to set the output of the load (6) to a desired output level, and to dither the duty cycle about a point corresponding to the desired output level.