Abstract:
본 발명은 RFID를 이용한 차량속도 측정방법, 차량속도 측정 가능한 RFID 판독장치 및 이를 이용한 차량정보 수집 시스템에 관한 것으로, 보다 상세하게는 RFID 태그와 RFID 리더 사이의 송수신 신호로부터 추출한 도플러 편이 값을 이용하여 차량속도를 연산함으로써 상기 RFID 태그가 부착된 차량의 차량식별 정보 및 속도정보를 동시에 획득할 수 있도록 하는 기술에 관한 것이다. RFID, 차량속도 측정, 도플러 편이
Abstract:
PURPOSE: An apparatus for guiding walking using human body communication is provided to exactly guide walking and to improve use convenience. CONSTITUTION: An apparatus for guiding walking using human body communication comprises: a first human body communication unit(100) which acquires a walking guiding information signal, changes the walking guiding information signal into a signal capable of human body communication, and transmits the signal through the body of a user; and a second human body communication unit(200) which receives the signal transmitted through the body of the user, changes the received signal into a signal that is recognized by the user, and outputs the signal.
Abstract:
PURPOSE: A telematics system using human body communication, a portable device having function of telematics using human body communication and a method for providing telematics service using human body communication are provided to perform a telematics service by configuring a communication network using a human body as medium. CONSTITUTION: In a telematics system using human body communication, a portable device having function of telematics using human body communication and a method for providing telematics service using human body communication, a vehicle(100) receives an authentication key from at least one portable device through human body communications using a human body as medium. The vehicle controls the open and close based on the validity of the authentication key received from the vehicle. A controller(110) reads out the stored authentication key when a user body is contacted with the vehicle. A human body communications unit(190) converts the authentication key into a signal to be transmitted through the human body. An electrode(195) transmits the signal from the human body communications unit to the vehicles through the user body.
Abstract:
PURPOSE: An apparatus for frequency selective transmission is provided to reduce the complexity of an analog transmission/reception terminal necessary for the transmission of a pass band. CONSTITUTION: A header generating unit(60) generates a header including the attribute information for transmission data, and a data generating unit(70) transmits digital data through a desirable frequency band. A pilot generating unit(80) generates a pilot which is inserted into a frame for frequency offset compensation. A multiplexer(90) receives the outputs of a preamble generating unit, an SFD/RI generating unit, the header generating unit, the data generating unit and the pilot generating unit, and multiplexes the outputs. A signal electrode(110) transmits the outputs of the multiplexer into a human body.
Abstract:
PURPOSE: Body sound transmitting apparatus and method are provided to minimize the loss of signals by transmitting a carrier wave signal for the demodulation of a sound signal through air. CONSTITUTION: A sound signal transmitting part(110) implements the modulation of a sound signal to be transmitted in order to transmit the modulated sound signal to the vicinity of an ear. A transmitting part(120) transmits a carrier wave signal to the vicinity of the ear through air in order to demodulate the modulated sound signal. The sound signal transmitting part includes a sound signal generator(111) and an amplitude modulator(112).
Abstract:
PURPOSE: A digital transmission device which selectively selects frequency is provided to select symbol rate which differs according to varying application and one among high performance mode, general mode, and low power mode according to the use clock and selects one among low speed spectrum methods of excellent transmission performance in each mode, thereby providing high quality. CONSTITUTION: A preamble transmission processor(211) generate preamble for frame synchronization. A header transmission processor(213,214) comprises a header including data property information. A data transmission processor(215,216,217) diffuses the transmission data to frequency selective spectrum code after serial-parallel converting about transmission data. A multiplexer(218) performs multiplex of each diffuse preamble, header and data.
Abstract:
PURPOSE: A low power relaxation oscillator and a RFID tag using the same are provided to generate a clock signal having a 50% duty ratio by repeating fixed operation. CONSTITUTION: A constant current generating unit(110) generates the current of a predetermined size. A current variant unit(120) controls the current generated from the constant current generating unit according to a clock control signal. First and second controllers(131,132) selectively pass through the current applied in the current variant unit. A PMOS charging and discharging unit(140) is arranged between an output terminal of the first controller and the output terminal of the second controller. First and second comparators(151,152) are respectively connected to both ends of the PMOS charging and discharging unit. The first and the second comparators output a voltage of a high or low level according to a charged voltage to the PMOS charging and discharging unit. A latch circuit(160) outputs an oscillation signal by respectively delaying the outputted voltage form the first and the second comparators.
Abstract:
본 발명에 따른 알에프 증폭기는, 알에프 신호를 증폭하는 증폭회로, 상기 증폭회로의 바이어스 전압을 제공하는 바이어스 전압 발생회로, 및 상기 증폭회로 및 상기 바이어스 전압 발생회로 사이에 연결되고, 상기 알에프 신호에 의해 상기 바이어스 전압이 영향을 받도록 결정된 저항값을 갖는 제 1 바이어스 저항을 포함한다. RF 증폭기, 선형, 바이어스 회로
Abstract:
A differential varactor is provided to improve common mode rejection ratio by forming gate varactor as a differential varactor. A first input terminal is connected with a source electrode of a first and a third gate varactor through a first and a third capacitor. A second input terminal a source of the second and fourth varactor through a second and fourth capacitor commonly. A source electrode of the first and the second gate varactor supplies positive bias voltage through a third and a fourth resistor(R3,R4). A source electrode of the third and fourth gate varactor supplies negative voltage through a fifth and a sixth resistor.
Abstract:
본 발명은 최대 출력에서 선형성을 만족시키면서, 최대 사용빈도를 갖는 영역에서 효율을 증대시켜 배터리의 사용시간을 연장할 수 있도록 한 저소비 전력 시스템에서의 전력증폭기에 관한 것이다. 본 발명의 전력증폭기는, 외부로부터 입력된 신호를 임피던스 정합시키기 위한 입력 임피던스 정합부; 상기 입력 임피던스 정합부를 경유한 신호를 증폭하기 위한 고출력 증폭부 및 저출력 증폭부; 상기 입력 신호의 전력 레벨에 따라 상기 고출력 증폭부 및 저출력 증폭부를 제어하는 증폭제어부; 상기 고출력 증폭부 및 저출력 증폭부로부터 증폭된 신호를 임피던스 정합시키기 위한 출력 임피던스 정합부; 및 상기 저출력 증폭부에 가변적인 동작 전압을 공급하기 위한 다이나믹 전압 공급부를 포함한다. 상기 구성에 따라, 최대 출력에서 선형성을 만족시키면서, 최대 사용빈도를 갖는 영역에서 효율을 증대시켜 휴대기기 배터리의 사용시간을 연장할 수 있는 효과가 있다. 전력증폭기, 이동통신 단말기, 임피던스 정합부, 증폭기 제어부