Abstract:
Disclosed is a light network control method. The light network control method for operating a light network control device including a control device and a plurality of control gears comprises the following steps: the control device transfers the right of using a light network to a first gear among the control gears; the first gear checks if there is data to be transferred to the control device and transfers the data to the control device using the right of using the light network; and when the data transmission is completed, the first control gear transfers the right of using the light network to another control gear.
Abstract:
본 발명은 선형성을 알려주는 가시광 송신 장치 및 방법에 관한 것으로, 특히 가시광 무선통신을 이용한 무선 송수신 시스템에서 오디오 신호의 왜곡이 발생하지 않도록 송신 장치의 가시광 발광부가 선형성을 이탈하여 동작하는지 여부를 알려주는 선형성을 알려주는 가시광 송신 장치 및 방법에 관한 것이다. 본 발명의 실시예에 따른 선형성을 알려주는 가시광 송신 장치는, 전기적 신호를 가시광 신호로 변환하여 송신하는 가시광 송신 장치로서, 상기 전기적 신호의 출력 전압 레벨을 모니터링하는 전압 레벨 모니터링부; 상기 가시광 신호의 송신을 위해 인가되는 바이어스 전압을 계산하는 바이어스 전압 계산부; 상기 출력 전압 레벨에 상기 바이어스 전압을 인가한 전압값이 상기 가시광 신호의 정해진 선형성 전압 구간 내부에 존재하는지 여부를 근거로 송신되는 상기 가시광 신호의 선형성을 판단하는 선형성 판단부; 및 상기 선형성 판단부의 판단 결과를 출력하는 선형성 알림부; 를 포함하는 것을 특징으로 한다.
Abstract:
PURPOSE: A visible light wireless communication method using inverted signals and a device for the same are provided to be applied to communication between vehicles having high external noises and far communication distances using both lamps of a vehicle as two conductive wires in a differential signal mode. CONSTITUTION: A pulse width modulation (PWM) section determination unit (1320) determines the length of an additional PWM section based on brightness information corresponding to headlight, tail light, and brake light from a bright information providing unit (1390) corresponding to a central control unit of a vehicle. A left signal transmission unit (1330) and a right signal transmission unit (1340) generate a transmission signal which is generated by synthesizing a data signal and a PWM signal based on a received data signal and PWM section length information received from the PWM section determination unit. The generated transmission signal is transmitted from a left LED emitting unit (1360) and a right LED emitting unit (1370) according to a signal from a transmission timing determination unit (1350) in order to prevent a transmission timing error. [Reference numerals] (1310) Inverse data signal generation unit; (1320) PWM section determination unit; (1330) Left signal transmission unit; (1340) Right signal transmission unit; (1350) Transmission timing determination unit; (1360) Left LED emitting unit; (1370) Right LED emitting unit; (1380) Transmission data providing unit; (1390) Bright information providing unit; (AA) Data section length calculation unit; (BB) Data section brightness calculation unit; (CC) PWM section length calculation unit; (DD,FF) Data and PWM signal synthesizing unit; (EE,GG) Data and PWM signal transmission unit
Abstract:
PURPOSE: A transmission device using visible ray wireless communication and a method thereof are provided to express various colors without changing a voltage applied to red, green, and blue LED light sources. CONSTITUTION: A color generating unit receives a color index and a brightness index(S1110). The color generating unit determines a color which occupies the highest rate among red, green, and blue to express a corresponding color(S1120). The color generating unit determines a pattern index of a corresponding LED(Light Emitting Diode)(S1130). The color generating unit determines a pattern index of an LED which emits the other colors(S1140). If a pattern index value is valid, a pattern generating unit generates a light source driving signal(S1150,S1160).
Abstract:
PURPOSE: A data communication device using visible light wireless communication and a method thereof are provided to determine interval time of data transmission, thereby performing dimming without encoding/decoding of a transceiving device. CONSTITUTION: A light output setting unit(442) sets the width of a pulse outputted from a light output signal based on receiving device moving speed and dimming information. A message processing unit(444) encodes inputted message data. The message processing unit merges the encoded message data with a light output signal outputted from the light output setting unit. A control signal generating unit(448) sets the cycle of transmitting a light output signal from the message processing unit based on the receiving device moving speed to generate a light output control signal.
Abstract:
PURPOSE: A visual light wireless communication method and a device for the same are provided to minimize the brightness reduction of a visual light source or a light device which is generated by a code for a communication and a demodulation function. CONSTITUTION: A coding and modulating unit(120) code and modulates each bit of a code which will transmits the code by at least one between a first modulating signal and a second modulating signal. The first modulating signal is for enabling light during a unit time in continuous on state. A second modulating signal is for generating the off/on of light within the unit time or generating on/off modification. A visible light source driving unit(130) drives the light by using a first modulating signal or a second modulating signal. The visible light source driving unit performs visible light wireless communication through the light.
Abstract:
PURPOSE: A visible light wireless communication system by using multi carrier and a method thereof are provided to use multi carrier technique capable of higher order modulation, thereby overcoming the limit of the transmission speed on existing strength modulation method in a VLC(Visible Light Communications). CONSTITUTION: A modulator unit(110) performs the symbol-mapping of transmission data. The modulator unit modulates symbols into parallel data. The modulator unit performs IFFT(Inverse Fast Fourier Transform) of the modulated data. The modulator unit divides the IFFT result value into the real number data and imaginary number data. A DAC(Digital Analog Converter) unit(130) respectively converts the real number data and imaginary number data into analog signal. A transmitting unit(150) transmits the converted real number data and imaginary number data by the visible ray.
Abstract:
본 발명은 광전송 시스템에서 써큘레이터를 이용하여 클럭을 복원하는 장치 및 방법에 관한 것이다. 본 발명에서 제시하는 클럭복원장치는 전송 속도가 서로 다른 N 종류의 입력데이터신호를 입력받아 출력하는 써큘레이터; N 종류의 입력데이터신호 각각의 전송 속도에 대응되는 N 종류의 클럭주파수성분 각각을 추출하는 대역통과필터부;및 추출된 N 종류의 상기 클럭주파수성분 각각을 증폭하는 클럭증폭부;를 포함하는 클럭복원장치를 포함한다. 광전송 시스템, 클럭 복원, 개방형 클럭 추출
Abstract:
본 발명은 광 전송 시스템의 개방형 클럭 추출 장치에 관한 것으로서, 입력된 데이터 신호를 두 개의 신호로 분기하여 출력하는 전력 분배기 블록; 상기 전력 분배기 블록으로부터 출력된 데이터 신호에 포함된 제1 클럭 주파수 성분을 추출하는 제1 대역 통과 필터 블록; 상기 전력 분배기 블록으로부터 출력된 데이터 신호에 포함된 제2 클럭 주파수 성분을 추출하는 제2 대역 통과 필터 블록; 상기 제1 대역 통과 필터 블록에서 추출된 제1 클럭 주파수 성분을 증폭하는 제1 클럭 증폭 블록; 및 상기 제2 대역 통과 필터 블록에서 추출된 제2 클럭 주파수 성분을 증폭하는 제2 클럭 증폭 블록을 포함하여, 서로 다른 전송 속도의 데이터로부터 각각의 전송 속도에 해당하는 클럭 신호를 추출할 수 있는 것이다. 광 전송 시스템, 개방형 클럭 추출 장치, 클럭 복원 회로, 수동형 필터
Abstract:
A multi-mode open type clock extracting device is provided to restore clock signals suitable for each transmission speed from data signals having different transmission speeds, therefore unnecessary to exchange a band pass filter block. A power divider block(420) branches an inputted data signal into two signals to output the branched signals. The first band pass filter block(430) extracts the first clock frequency component included in the outputted data signals. The second band pass filter block(450) extracts the second clock frequency component included in the outputted data signal. The first clock amplification block(440) amplifies the extracted first clock frequency component. The second clock amplification block(460) amplifies the extracted second clock frequency component.