Abstract:
PURPOSE: A human body acoustic transmission apparatus is provided to get stereophonic sound effect without making an ambient noise. CONSTITUTION: A processing unit(110) processes an acoustic signal, an acoustic high frequency and a second high frequency signal of an audible frequency that wants to a transmit band included. The acoustic signal is combined with a first radio frequency signal at the acoustic high frequency signal. A transmit unit(120) is provided with the combining signal of a second high frequency signal and an acoustic high frequency signal from a cell processing. The transmit unit transmits a combining signal by using a human body as a medium.
Abstract:
PURPOSE: A method for producing a communication frame of a body area network, and a communication method of a body area network using the same are provided to enable plural body area terminals to coexist in a narrow space without communication interference. CONSTITUTION: A method for producing a communication frame of a body area network comprises the steps of: detecting the number of terminals which exist in a predetermined area(310); allocating individual frames to use each terminal existing in the predetermined region according to the number of the detected terminals(320); and allocating a transmission co-existence frame to all terminals existing the predetermined region according to the number of the detected terminals(330), wherein the co-existence frame includes the allocation information on the individual frame used by each terminal.
Abstract:
PURPOSE: A communication apparatus using a near field is provided to enable a communication apparatus to efficiently perform power supply and to increase data transmission ratio by sharing an interface. CONSTITUTION: A near field signal providing unit(110) supplies one of signals, which applies digital modulation to a base band signal, to a near filed signal. An interface unit(120) transmits and receives the near field signal. A control unit(130) controls the interface unit and the near field signal providing unit.
Abstract:
PURPOSE: A communication system using a portion of a human body is provided to create a stable radio channel using a low frequency band. CONSTITUTION: Transmitting party and receiving party communication devices(10,20) transmits and receives data signals through a wireless transmitting mode. The transmitting party and receiving party couplers transfer data signals between the transmitting party and receiving party communication devices and a human body(30). Transmitting party and receiving party impedance matching devices enables impedance matching between the transmitting party and receiving party communication devices and the transmitting party and receiving party couplers. The transmitting party communication device applies the transmitting data signal of an electrical signal form through the transmitting party coupler to the human body.
Abstract:
A RF amplifier is provided to increase linearity by varying a current provided in a bias circuit according to a change of an output power level. A main circuit(120) amplifies a RF signal(RFIN). A bias circuit(140) sets a bias condition of the main circuit. The bias circuit includes a bias resistor(RB1) for delivering a RF voltage(v-rf) from the inputted RF signal. The main circuit includes an input capacitor(CIN) which removes a DC voltage component of the inputted RF signal, an amplifying circuit which amplifies an output signal of the input capacitor, and an output capacitor(COUT) which removes a DC voltage component from the output signal of the amplifying circuit. The bias circuit includes a bias voltage generating circuit(141) which provides a bias voltage of the amplifying circuit and a bias resistor connected between the bias voltage generating circuit and the amplifying circuit.
Abstract:
The low dissipation mixed mode power amplifier is provided to extend the life time of battery by maximizing the efficiency of the maximum usage frequency region. The mixed mode power amplifier(1000) comprises the low output amplifier circuit(1100), the high power amplification circuit(1200), and the amplifier control part(950) and bias circuit(900). The low output amplifier circuit comprises the input impedance conformable part(100), the primary amplification section(200), and the first mid-stage impendence matching line(300) and low output amplifier(700). The high power amplification circuit(1200) comprises the second amplifier(400), and the second mid-stage impendence matching line(500) and high power amplifier(600).
Abstract:
본 발명은 가변 이득계수를 이용한 저복잡도 및 저전력 터보복호기에 관한 것으로, SDR(Sign Difference Ratio)값을 이용하여 터보 복호기의 복호수렴 정도를 평가하고 반복 복호 횟수를 제한하는 한편, 상기 SDR값을 기반으로 각 복호수렴 영역마다 최적의 성능을 갖는 가변 이득계수(variable scaling factor)를 계산하여 적용함으로써, 저복잡도 터보 복호기의 성능 열화를 개선시킴과 동시에 평균 반복 복호 횟수를 줄여 전력소모량을 줄일 수 있는 것을 특징으로 한다. 본 발명에 따르면, EMLMAP 알고리즘의 단점이라고 할 수 있는 부호화 블록의 크기가 큰 경우에 대한 성능 열화를 개선시킬 수 있으며, 평균 반복 복호 횟수를 감소시켜 전력소모량을 감소시킬 수 있는 효과가 있다. 터보 디코더(turbo decoder), 조기종료(Early Stopping)
Abstract:
A voltage controlled oscillator having a switching bias is provided to reduce flicker noise and to improve a phase noise characteristic by applying switching bias technique. An LC resonance circuit(120) oscillates a resonant frequency according to an input voltage. A loss compensation circuit(140) is composed of first and second transistors to amplify the oscillated resonant frequency. A bias circuit(160) is composed of third and fourth transistors to provide bias current to the first and second transistors. A peak detector(180) is composed of fifth and sixth transistors and third and fourth capacitors in order to detect a peak value from an oscillation waveform of the LC resonance circuit, and to apply the peak value to the third and fourth transistors of the bias circuit. A switching circuit(190) turns on/off the third and fourth circuits of the bias circuit according to the oscillation waveform.
Abstract:
A turbo decoder with low complexity and low power consumption using a variable scaling factor is provided to reduce the power consumption of the turbo decoder by reducing the average number of repeated decoding. A turbo decoder with low complexity and low power consumption using a variable scaling factor includes a first component decoder(210), a second component decoder(230), an early stoppage judging unit(250), and a variable scaling factor computing unit(260). The first and second component decoders(210,230) repeatedly perform decoding regarding the bits decoded by a turbo code according to the variable scaling factor. The early stoppage judging unit(250) checks the value of SDR(Sign Difference Ratio), and variably controls the number of repeated decoding according to the value of the SDR. The variable scaling factor computing unit(260) computes a variable scaling factor in each area of decoding convergence according to the value of SDR.
Abstract:
본 발명은 PLL(Phase locked-loop)이나 DLL(Delay locked-loop)에 사용되는 위상 주파수 검출기에 관한 것으로, 소정 시간 지연된 기준클럭과 리셋신호에 따라 동작되는 제 1 스테이지, 상기 기준클럭과 상기 제 1 스테이지의 출력에 따라 동작되는 제 2 스테이지 및 상기 제 2 스테이지의 출력을 반전시켜 출력하는 인버터로 구성된 업 신호 출력부, 소정 시간 지연된 외부클럭과 상기 리셋신호에 따라 동작되는 제 1 스테이지, 상기 외부클럭과 상기 제 1 스테이지의 출력에 따라 동작되는 제 2 스테이지 및 상기 제 2 스테이지의 출력을 반전시켜 출력하는 인버터로 구성된 다운 신호 출력부, 상기 업 신호 출력부의 제 2 스테이지 출력과 상기 다운 신호 출력부의 제 2 스테이지 출력을 논리 조합하여 상기 리셋신호를 생성하는 논리 게이트를 포함한다. 유효한 제어신호를 얻을 수 있는 입력신호의 위상 범위가 넓으므로 위상고정이 빨라지고, 다이나믹 로직의 적은 전력소모와 빠른 신호전달 특성으로 인해 저전력 및 저잡음 특성을 가진다. 위상 주파수 검출기, 위상고정, 동작 주파수, 지연수단