Class / Patent application number | Description | Number of patent applications / Date published |
398172000 | Including visible light modulation | 33 |
20080298811 | APPARATUS AND METHOD FOR TRANSFERRING AN OPTICAL SIGNAL IN A WIRELESS VISIBLE LIGHT COMMUNICATION SYSTEM - A wireless visible light communication system is provided. The system includes optical transmitters and optical receivers for receiving optical signals, wherein each of the optical transmitters includes a first light source for generating an optical signal, and at least one light source capable of generating light which has a color equal to that of the optical signal, and has a wavelength different from that of the optical signal. | 12-04-2008 |
20090074424 | DEVICE, SYSTEM AND METHOD OF TRANSFERRING INFORMATION OVER A COMMUNICATION NETWORK INCLUDING OPTICAL MEDIA - Embodiments of the invention provide methods, devices and systems of transferring information upstream from two or more sets of user devices in a cable communication network. The system, according to some demonstrative embodiments of the invention, may include two or more optical transmitters to transmit two or more respective light beams having two or more respective wavelength spectra, the light beams carrying two or more respective optical signals of upstream information from the two or more sets of user devices, respectively; a combiner to combine the two or more light beams into a multicolor light beam carrying the two or more optical signals; and a multicolor receiver to convert the multicolor light beam into an electrical radio frequency signal carrying the information from the user devices. Other embodiments are described and claimed. | 03-19-2009 |
20090297166 | Illuminative light communication device - The illuminating end communication device is equipped with an illuminating light source. An electric power fed to the light source is modulated with a modulating unit responding to transmission data, and the modulated light is sent out as illuminating light. The illumination light is received by the light receiving unit of a terminal end communication device to maintain a downlink. Light emitted from the light emitting unit of the terminal end communication device is received by the light receiving unit of the illuminating end communication device to keep an uplink. Or, illuminating light is modulated on the basis of data when it is reflected, whereby data can be transmitted to the illuminating end communication device. It is preferable that illuminating light is reflected by CCR. A high-quality communication is realized using illuminating light of high power. | 12-03-2009 |
20090324248 | ILLUMINATION LIGHT RECEIVER AND ILLUMINATION LIGHT COMMUNICATIONS SYSTEM - An illumination light receiver includes: a wavelength separation mechanism separating visible light containing optical signal data distributed among wavelengths corresponding to three primary colors into the wavelengths corresponding to the three primary colors; a dispersion restraining mechanism restraining dispersion of light outputted from the wavelength separation mechanism; and a light receiving portion illuminated, separately for each of the separated wavelengths corresponding to the three primary colors, by the light outputted from the dispersion restraining mechanism, the light receiving portion converting the optical signal data into and extracting an electrical signal. | 12-31-2009 |
20100028021 | METHOD AND APPARATUS FOR VISIBLE LIGHT COMMUNICATION USING SINGLE LIGHT SOURCE - Disclosed herein is a visible-light communication system according to one embodiment of the invention. The system comprises two apparatus. One apparatus emits a visible light beam on which is superimposed transmission data. From the void data represented by the visible light beam, the other apparatus generates a retroflected light beam, superimposes transmission data on the retroflected light beam, and applies the retroflected light beam to the apparatus. On receiving the retroflected light beam, the apparatus identifies the transmission data coming from the other apparatus, on the basis of the identification data superimposed on the retroflected light beam. | 02-04-2010 |
20100067919 | ILLUMINATING LIGHT COMMUNICATION SYSTEM AND TRANSMITTING DEVICE FOR ILLUMINATING LIGHT COMMUNICATION - The present invention is directed to providing anew illuminating light communication system capable of transmitting large-capacity data at high speed. A transmitting device 1 emits light modulated depending on data to be transmitted from an organic EL light source 4. A receiving device 2 receives the modulated light emitted from the organic EL light source 4 and converts the received modulated light into an electric signal, and demodulates the data from the electric signal obtained by the conversion. | 03-18-2010 |
20100135671 | APPARATUS FOR TRANSMITTING AND RECEIVING VISIBLE LIGHT COMMUNICATION DATA - An apparatus for transmitting visible light communication data is provided, the apparatus including a common modulation unit generating a modulated signal for transmitting a first visible light communication data, a plurality of individual modulation units generating modulated signals for transmitting a plurality of second visible light communication data, and a plurality of light emitting units receiving the modulated signals from the plurality of individual modulation units, respectively, and outputting visible light signals, wherein an output of the common modulation unit is the input as an output control signal of the individual modulation units. | 06-03-2010 |
20100196018 | METHOD AND DEVICE FOR COMUNICATING DATA USING A LIGHT SOURCE - A method is described for driving a light source, particularly a HID lamp ( | 08-05-2010 |
20100254712 | METHOD, SYSTEM AND DEVICE FOR TRANSMITTING LIGHTING DEVICE DATA - It is presented a method for transmitting lighting device data. The method comprises the steps of obtaining, in a lighting device, a subset of lighting device data, the lighting device data containg information of the lighting device, transmitting, from the lighting device, using light, the subset of lighting device data, and repeating the above steps until all subsets jointly corresponding to the complete lighting device data have been transmitted. A corresponding lighting device and lighting system are also presented. | 10-07-2010 |
20100266292 | LIGHT RECEIVING CIRCUIT AND PHOTOCOUPLER ISOLATION CIRCUIT - A light receiving circuit includes: a light receiving element that receives an optical signal and converts into an electrical signal; a comparator that demodulates the information on the optical signal to a pulsed signal; a band limit circuit disposed between the light receiving element and the comparator, the band limit circuit removing noise components of frequency higher than the pulsed signal; and a comparator threshold circuit disposed between the light receiving element and the comparator, the comparator threshold circuit generating a threshold of the comparator and limiting the threshold of the comparator within a binary range. | 10-21-2010 |
20110069971 | METHOD AND APPARATUS FOR OUTPUTTING VISIBILITY FRAME IN VISIBLE LIGHT COMMUNICATION SYSTEM PROVIDING MULTIPLE COMMUNICATION MODES - A method and apparatus are provided for outputting a visibility frame for a communication link connection during a communication link release in a Visible Light Communication (VLC) system. A transmitting-side VLC device determines a visibility frame output type according to a communication mode to be performed. The communication mode and the visibility frame output type are transmitted to a receiving-side VLC device. The receiving-side VLC device is communicated with according to the communication mode and it is determined whether a communication link is released while performing communication according to the communication mode. When the communication link is released, outputting a visibility frame according to the visibility frame output type. | 03-24-2011 |
20110085804 | MULTIMODE OPTICAL TRANSMISSION DEVICE - An optical transmitting circuit ( | 04-14-2011 |
20110091220 | APPARATUS AND METHOD FOR CHANNEL AGGREGATION AND GUARD CHANNEL INDICATION FOR VISIBLE LIGHT COMMUNICATION - A method, apparatus, and a non-transitory computer readable storage medium for supporting visible light communication (VLC) exchanges bitmaps for capabilities field exchange in a media access control (MAC) layer during link establishment and association with other VLC-enabled devices. An aggregation bitmap is generated to indicate whether a visible light communication (VLC) transmitter of a first device uses at least one aggregated band that comprises multiple active frequency bands. The aggregation bitmap is transmitted in a capabilities information exchange (CIE) signal to a second device. A guard bitmap that identifies a set of guard frequency bands is also generated and transmitted in the CIE signal. Each guard frequency band indicates leakage transmission from the VLC transmitter. | 04-21-2011 |
20110135317 | CONTROLLING BRIGHTNESS OF LIGHT SOURCES USED FOR DATA TRANSMISSION - In a first embodiment of the present invention, a method is provided comprising: receiving a selection of a desired brightness level of a light source; receiving a piece of data to be transmitted via visible light communication using the light source; selecting a duty cycle, described by an encoding scheme, based on the desired brightness level; encoding the data using the encoding scheme, wherein the encoding includes identifying a code corresponding to both the piece of data and the selected duty cycle; and transmitting the identified code via visible light communication using the light source. | 06-09-2011 |
20110164884 | VISIBLE LIGHT COMMUNICATION TRANSMITTER AND VISIBLE LIGHT COMMUNICATION SYSTEM - Visible light data communication with a sufficient transmission speed is performed using a general-purpose and cost-advantageous blue-light-excitation-type white LED without using a blue color filter while preventing the element from being damaged. When transmission data is inputted to a driving waveform generation unit ( | 07-07-2011 |
20110229147 | VISIBLE RAY COMMUNICATION SYSTEM AND METHOD FOR TRANSMITTING SIGNAL - A visible ray communication system and method that improve transmission rate and remove an influence of inter-color interference to improve the communication quality. A transmission apparatus included in the visible ray communication system allocates each carrier signal component of an OFDM signal, which is modulated into transmission information, to a plurality of LEDs of different colors. The information is added to a combination of a carrier frequency and an LED wavelength, when a carrier signal is allocated to an, in addition to each carrier signal being modulated into the information. | 09-22-2011 |
20110299857 | TRANSMISSION DEVICE, TRANSMISSION METHOD, RECEPTION DEVICE, RECEPTION METHOD, COMMUNICATION SYSTEM, AND COMMUNICATION METHOD - There is provided a transmission device including an optical signal generation section configured to generate an optical signal formed by arranging one or more of each of a plurality of kinds of same-color light beams each having different phase, and a transmission section configured to transmit the optical signal generated by the optical signal generation section. | 12-08-2011 |
20120106977 | SYSTEM AND METHOD FOR COMMUNICATING USING VISIBLE LIGHT - A server device to transmit a message through a visible light communication, in which the server includes a visible light communication unit to transceive data through visible light communication; a message reception unit to receive a message; a message identification unit to identify a receiving object, a message type, and a transmission characteristic of the message; and a message transmission unit to transmit the message to the receiving object according to the transmission characteristic of the message. A method for transmitting a message though visible light communication, in which the method includes receiving a message; identifying a receiving object of the message, a message type and a transmission characteristic of the message; and transmitting the message to the receiving object according to the transmission characteristic of the message using the visible light communication. | 05-03-2012 |
20120230703 | Visible Light Communication Receiver, Visible Light Communication System, and Visible Light Communication Method - A visible light communication receiver increases a communication distance from a transmitter to a receiver while realizing high transmission speed. The visible light communication receiver includes a receiving unit that receives a visible light signal from a blue light-excited white LED driven by a driving current signal generated by adding rising and falling pulses to respective rising and falling edges of a transmission data encoded according to a DC-free RLL code having a minimum run of 1 and NRZI-modulated prior to adding the rising and falling pulses; a photoelectric converter that converts the visible light signal into an electrical signal; an equalizer that equalizes the electrical signal to a duobinary signal; a discriminator that discriminates the duobinary signal to generate a 3-value signal; a maximum-likelihood decoder that ML-decodes the 3-value signal to output a decoded signal; and a decoder that RLL decodes the decoded signal. | 09-13-2012 |
20120269520 | LIGHTING APPARATUSES AND LED MODULES FOR BOTH ILLUMATION AND OPTICAL COMMUNICATION - Lighting apparatuses and LED modules capable of both illumination and data transmission are disclosed. An exemplifying lighting apparatus has a LED module and a modulator. The LED module comprises a plurality of LED cells connected as a LED chain having two conductive pads. The light emitted from the LED module is visible. The modulator provides driving current to the LED module to transmit data. | 10-25-2012 |
20130004183 | APPARATUS FOR VISIBLE LIGHT COMMUNICATION PROVIDING INTUITIVE INFORMATION AND METHOD USING THE SAME - There is disclosed a visible light communication technology capable of intuitively recognizing a transmission speed, an alignment status, a communication status, or a transmission rate. A visible light communication apparatus according to an embodiment of the present invention includes: a light source selecting unit selecting at least one light source of a plurality of light sources generating lights having different wavelengths by considering intuitive information distinguished depending on a wavelength in a visible light band; and a visible light communication unit performing visible light communication by at least one selected light source to allow the intuitive information to be recognized by a color corresponding to at least one selected light source. Accordingly, a user using the visible light communication can intuitively know an optimal communication status or transmission speed. | 01-03-2013 |
20130004184 | APPARATUS FOR VISIBLE LIGHT COMMUNICATION PROVIDING INTUITIVE INFORMATION AND METHOD USING THE SAME - There is disclosed a visible light communication technology capable of intuitively recognizing a transmission speed, an alignment status, a communication status, or a transmission rate. A visible light communication apparatus according to an embodiment of the present invention includes: a light source selecting unit selecting at least one light source of a plurality of light sources generating lights having different wavelengths by considering intuitive information distinguished depending on a wavelength in a visible light band; and a visible light communication unit performing visible light communication by at least one selected light source to allow the intuitive information to be recognized by a color corresponding to at least one selected light source. Accordingly, a user using the visible light communication can intuitively know an optimal communication status or transmission speed. | 01-03-2013 |
20130028612 | METHOD AND SYSTEM FOR MODULATING A BEACON LIGHT SOURCE IN A LIGHT BASED POSITIONING SYSTEM - In one aspect, the present disclosure relates to a method for broadcasting a modulated digital pulse recognition signal from a light source. In some embodiments, the method includes selecting one or more digital pulse recognition tones to broadcast, determining a desired brightness level for the light source, generating a digital pulse recognition signal having a duty cycle based on the desired brightness level and a frequency based on the one or more digital pulse recognition tones, and driving the output of the light source with the digital pulse recognition signal. In some embodiments, selecting one or more digital pulse recognition tones to broadcast includes generating a single periodic tone for differentiating the light source from a nearby light source. In some embodiments, selecting one or more digital pulse recognition tones to broadcast includes generating a sequence of periodic tones. | 01-31-2013 |
20130148980 | Method and System for Color-Shift Keying Using Algorithms - A system and method for optimizing signal recognition in a light communication system by approximately maximizing the minimum distance between received constellation points; the method comprising identifying the constellation region containing points for transmitting symbols, identifying channel impairments, transforming the constellation region according to the channel impairments into a constellation region of potential received symbols, using signal processing circuitry to apply an algorithm that operates to maximize the minimum distance between constellation points to obtain a symbol constellation in the receiver constellation region, and inverting the transformation to obtain the designed transmitted-symbol constellation. The system comprises signal processing circuitry for performing a preferred methodology. | 06-13-2013 |
20140178080 | APPARATUS AND METHOD FOR DATA EMBEDDING IN LIGHT COMMUNICATION AND THE LIGHT COMMUNICATION SYSTEM AND METHOD THEREOF - In a light communication system, a data embedding unit arranged between a transmitter-side communication data processing unit and a light emitting device driver embeds a communication processed data at a spatial domain of an original image according to a modulation scheme, and gets multiple RGB values for a communication data embedded image. A receiving apparatus detects a transmitter-side communication data embedded image, generates a receiver-side communication data embedded image, compensate a deformation of the receiver-side communication data embedded image, outputs a warped communication data embedded image, and extracts a communication processed data from the warped communication data embedded image. | 06-26-2014 |
20140193162 | INFORMATION TRANSMISSION SYSTEM, INFORMATION SENDING DEVICE, INFORMATION RECEIVING DEVICE, INFORMATION TRANSMISSION METHOD, INFORMATION SENDING METHOD, INFORMATION RECEIVING METHOD AND PROGRAM PRODUCT - An information transmission system includes: an information sending device including a light emitting section that emits light in a plurality of colors, a modulating section that modulates information to be transmitted into signals composed of changes in color, and a light emission control section that controls the light emitting section to emit light while changing color temporally based on the signals generated by the modulating section; and a receiving device including a camera that captures an image having color, and a control and communication section that detects a temporal color change of the light emitting section emitting light by light emission control by the information transmitting device, from images consecutively captured by the camera, decodes the detected color change into information, and outputs the generated information to a display section. | 07-10-2014 |
20140199082 | INFORMATION PROVISION SYSTEM, SERVER SYSTEM, TERMINAL DEVICE, INFORMATION PROVISION METHOD, AND RECORDING MEDIUM - A portable terminal sends to a second server sound contents request information comprising a tag ID corresponding to light received from an illumination device, the light-receiving position on the light-receiving surface, and the area ratio of the light-receiving range to the light-receiving surface in order to acquire sound contents. The second server | 07-17-2014 |
20140369696 | Color Coding and Optical Sub-Band Communication Utilizing Color Coding - Data transmission method and apparatus utilizing color coding is disclosed. A one-to-one correspondence between a set of eight unique 3-bit data units and a set of eight unique color representations is established for color coding a sequence of 3-bit data units. Transmission of the sequence of 3-bit data units is then facilitated using a sequence of color representations, wherein each one of the sequence of 3-bit data units has a one-to-one correspondence with one of the sequence of color representations. | 12-18-2014 |
20150372753 | TRANSMISSION OF IDENTIFIERS USING VISIBLE LIGHT COMMUNICATION - Methods, systems, and devices are described for transmitting an identifier using visible light communication (VLC) and for generating a plurality of identifiers for transmission using VLC. Input identifying an illumination factor associated with a light source is received. A first set of modulation parameters is modified for transmitting the identifier using VLC. The first set of modulation parameters is modified based on the illumination factor. A signal, in which the identifier is encoded, is applied to the light source. The signal is applied according to the first set of modulation parameters. Another method includes identifying a number of light transmitting devices, generating a plurality of identifiers based on the identified number of light transmitting devices, storing the generated identifiers, determining a plurality of cyclic shifts for each identifier in the plurality of identifiers, and removing identifiers from the plurality of identifiers that match the identified cyclic shifts. | 12-24-2015 |
20160191158 | TRANSMITTING METHOD, TRANSMITTING APPARATUS, AND PROGRAM - In a transmitting method that enables communication between various devices including devices other than lightings, a luminance change pattern is determined by modulating a visible light signal, a common switch for turning ON, in common, a plurality of light sources which are included in a light source group of a display and are each used for representing a pixel in an image is switched according to the luminance change pattern, and a first pixel switch for turning ON a first light source among the plurality of light sources included in the light source group is turned ON, to cause the first light source to be ON only for a period in which the common switch is ON and the first pixel switch is ON, to transmit the visible light signal. | 06-30-2016 |
20160191159 | INFORMATION PROCESSING METHOD FOR GENERATING ENCODED SIGNAL FOR VISIBLE LIGHT COMMUNICATION - An information processing program causes a computer to execute: encoding information to be transmitted, to determine a luminance change frequency; and outputting a signal of the determined luminance change frequency to cause a light emitter to change in luminance according to the determined luminance change frequency to transmit the information. In the encoding, each of a first frequency and a second frequency different from the first frequency is determined as the luminance change frequency. In the outputting, each of a signal of the first frequency and a signal of the second frequency is output as the signal of the determined luminance change frequency, to cause the light emitter to change in luminance according to the first frequency during a first time and change in luminance according to the second frequency during a second time different from the first time after the first time elapses. | 06-30-2016 |
20160197675 | SELF IDENTIFYING MODULATED LIGHT SOURCE | 07-07-2016 |
20160197676 | Positioning Method Based on Visible Light Source, Mobile Terminal, and Controller | 07-07-2016 |