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 발명은 인체 통신을 이용한 감지 장치에 관한 것으로서, 인체의 내부에 투입되어 인체 내부의 영상 정보를 취득하고, 상기 취득한 정보에 대한 신호를 주파수 선택적 확산 방식에 의한 변조를 거쳐 동일한 위상을 갖는 디지털 신호를 하나 이상의 전극을 통해 인체 내부에서 외부로 전송하는 무선 캡슐; 및 인체의 외부에서 상기 인체를 매질로 상기 무선 캡슐과 무선 통신하여 인체와 접한 전극을 통해 상기 무선 캡슐로부터 전송되는 상기 디지털 신호를 수신하고, 수신된 상기 디지털 신호를 무선 데이터 처리하여 저장하는 휴대용 데이터 기록기를 포함하여 구성될 수 있으며, 인체를 매질로 주파수 변조 방식을 사용하지 않고 주파수 선택적 확산 방식을 사용함으로써 변복조 과정에서 필요로 하는 회로들을 제거하여 소비되는 전력을 줄일 수 있고, 광대역의 디지털 신호(기저대역 신호)를 직접 인체에 전송함으로써 높은 전송율을 얻을 수 있으며, 양 방향 통신을 통해 원하는 데이터를 안정적으로 확보할 수 있다. 인체 통신, 감지 장치, 전극, 정보 취득부, 무선 캡슐, 휴대용 데이터 기록기.
Abstract:
본 발명은 심볼 오류정정이 가능한 주파수 선택적 기저대역을 사용하는 변복조 방법 및 그 장치에 관한 것으로, 주파수 확산에 사용되는 2 N (N은 실수)개의 전체 확산부호 또는 직교부호를 2 M (M M 개의 확산부호 중 하나의 확산부호가 선택되도록 함으로, 전체 P개의 확산부호를 획득하는 단계; 상기 채택된 P개의 서브그룹으로 입력되는 P*M개의 데이터 비트를 사용하여 심볼 오류정정을 위한 L*M개의 패리티 비트를 생성하는 단계; 상기 L*M개의 패리티 비트를 상기 L개의 서브그룹으로 입력하여, 상기 L개의 서브그룹에서 2 M 개의 확산부호 중 하나의 확산부호가 선택되도록 하는 단계; 상기 P+L개의 서브그룹으로부터 획득된 P+L개의 확산부호에서 다수값을 선택하여, 상기 다수값으로 이루어진 전송 데이터를 발생하는 단계를 포함하여 구성되며, 이에 의하여 전체 시스템의 프로세싱 이득 개선, 전송 데이터률 증가 및 더욱 안정된 디지털 통신을 저전력으로 구현할 수 있는 효과를 가진다. 주파수 선택적 기저대역, 다중 전송, 통신, 통신 모뎀, 심볼 오류정정
Abstract:
본 발명에 따른 인체 통신 시스템은 의사잡음 코드가 맨체스터 인코딩된 프리엠블을 포함하는 프레임을 상기 인체로 전송하는 송신부, 그리고 상기 인체로부터 상기 프레임을 수신하여 맨체스터 디코딩하고, 상기 디코딩 결과 및 상기 의사잡음 코드의 상호 상관을 수행하고, 그리고 상기 상호 상관 결과를 근거로 하여 프레임 동기를 수행하는 수신부를 포함한다. 본 발명에 따르면, 클럭 및 데이터 복원 동작 성능이 향상된다. 본 발명은 계산량을 줄인 효율적인 프레임 동기 방식을 제공한다.
Abstract:
A human body communication system and a method are provided to communicate a wireless internal capsule to an external recording device at high speed with a little power consumption, thereby replacing a conventional RF method. A human body communication system and a method include a wireless capsule(100) and a portable data recorder(200). The wireless capsule is located inside a human body to obtain internal image information and to transmit the obtained internal image information to the outside. The portable data recorder is in communication with the wireless capsule. The portable data recorder receives signals transmitted from the wireless capsule and stores the received signals through a wireless data process.
Abstract:
A TDD(Time Division Duplex) mode communications device and an operation method for stabilizing clock without a crystal oscillator are provided to generate the operation clock of receiver and transmission unit by penuriously using a CDR circuit used for clock and reconstitution of data of the receive frame. An analog front end unit(21) receives a receive frame from outside and outputs transmission frame. An analog front end restores the clock and data of the received signal through CDR(Clock Recovery Data Retiming). A transmission unit(22) is operated by using the clock signal of the reference frequency generated in CDR for the transmission time interval. The transmission unit generates the transmission frame. A receiver(23) is operated by using the clock signal restored by CDR from the receive frame for the receive timing section. The receiver processes data restored in the analog front end.
Abstract:
A receiver and a receiving method for a human body communication system are provided to transmit data stably without the reduction of a transmission speed by reducing distortion of a channel and a noise of a signal. A human body communication transceiver includes a human body communication MAC(31), a human body communication physical layer modem(32) and a transmission signal electrode(330). A human body communication receiving device includes a plurality of receiving signal electrodes(333,335,337), and a human body communication AFEs(332,334,336) connected to the plurality of received signal electrodes(333,335,337), and a receiving unit. The human body communication MAC is composed of a MAX transmitting processor(311) and a MAX receiving processor(312). A transmission unit(321) in the human body communication physical layer modem is composed of a data generator(3210) and a frequency selective diffusion modulator(3211). The signal transmitted through the transmitting signal electrode is delivered through the human body channel. The receiving signal electrode attached to the human body receives the signal delivered through the human body channel. The signal received through the plurality of receiving signal electrodes includes the equal data. If the plurality of receiving signal electrodes are used, the electrode direction of the receiving signal attached to the human body is varied.
Abstract:
A method for modulation and demodulation capable of improving transmitted-data rate using frequency selective baseband and apparatus thereof are provided to reduce energy consumption about a data transmission by using a limited frequency band. A method for modulation and demodulation capable of improving transmitted-data rate using frequency selective baseband comprises the following steps: a step for generating a plurality of sub groups by dividing a total spreading code of 2N(N is real number) used for a spread spectrum into a number unit of 2M(M
Abstract:
A human body contact control apparatus is provided to automatically control whether to make a ground electrode come in contact with human body according to human body contact locations(for example, wrist and the fingertips) of a system. A human body contact control apparatus comprises the followings: a resistance measuring means(402) for applying predetermined voltage in the human body through a signal electrode and measuring the resistance value between the ground electrode and the signal electrode; a contact control means(401) for providing a human body contact controlling signal after determining whether to make a ground electrode come in contact with the human body by using the measured resistance value; and a contact performing means for making the ground electrode come in contact with the human body according to the human body contact controlling signal.
Abstract:
A digital communication system using a frequency selective baseband and a method thereof are provided to reduce the complexity of analog transmitting/receiving terminals using the serial/parallel conversion of data and a frequency selective diffusion code, thereby improving the power consumption of the entire system. A transmitter(221) in a digital communication system comprises a preamble/header transmitting unit(2210,2211,2212,2213), a data transmitting unit(2214,2215,2216,2217), and a multiplexing unit(2218). The preamble/header transmitting unit diffuses header information comprised of a preamble for frame synchronization and data property information. The data transmitting unit diffuses data to be transmitted to the outside using a frequency selective diffusion code. The multiplexing unit performs the multiplexing of the preamble and header diffused by the preamble/header transmitting unit, and data diffused selectively according to a frequency in the data transmitting unit and transmits the diffused preamble, header and data which are converted into digital signals.