Patent application number | Description | Published |
20100045446 | RFID SYSTEM USING HUMAN BODY COMMUNICATION - An a Radio Frequency Identification (RFID) system using human body communication includes a first electrode pad receiving a signal of a reader transmitted through a human body, or outputting an output signal to the human body, a rectifier rectifying the signal of the reader to generate a direct current (DC) voltage, a power manager changing the DC voltage into an operation voltage, a modulator/demodulator demodulating the signal of the reader, or modulating the output signal of the tag to transfer the modulated signal to the first electrode pad, a digital controller performing a read or write operation in response to the signal of the reader demodulated by the modulator/demodulator, and a memory storing identification information of the tag and information according to an operation result of the digital controller. | 02-25-2010 |
20100141348 | LOW-POWER RELAXATION OSCILLATOR AND RFID TAG USING THE SAME - There is provided a low-power relaxation oscillator. The low-power relaxation oscillator may include: a constant current generation unit generating a current having a predetermined magnitude; a current varying unit controlling the current generated from the constant current generation unit according to a clock control signal to output the controlled current; a first controller and a second controller connected in parallel with output terminals of the current varying unit and passing or interrupting the current supplied from the current varying unit; a PMOS charging/discharging unit arranged between an output terminal of the first controller and an output terminal of the second controller; a first comparator and a second comparator connected to both ends of the PMOS charging/discharging unit, respectively, and each outputting a high or low level voltage upon receiving voltage charged in the PMOS charging/discharging unit; and a latch circuit delaying the voltages output from the first and second comparators to output oscillation signals. | 06-10-2010 |
20100171562 | APPARATUS AND METHOD FOR MODULATION AND DEMODULATION USING FREQUENCY SELECTIVE BASEBAND - Provided are modulation and demodulation methods and apparatuses using a frequency selective baseband. The frequency modulation method includes: generating a plurality of subgroups by dividing 2N (N is a real number) spread codes used for frequency spreading into 2M (M07-08-2010 | |
20100197225 | METHOD AND APPARATUS FOR COMMUNICATING SOUND WAVE OF HUMAN BODY - A method and apparatus for communicating a sound wave is provided. The apparatus includes: a sound wave converter converting a sound wave signal transmitted from a counter apparatus through the human body into an electrical signal when the sound wave is transmitted from the counter apparatus through the human body and converting an electrical signal on data to be output to the counter apparatus into a sound wave; a data processor receiving the converted electrical signal from the sound wave converter and transmitting an electrical signal on the data to be output to the sound wave converter when the data to be output exists; and a switch connected between the sound wave converter and the data processor, the switch transmitting the converted electrical signal to the data processor and transmitting the electrical signal on the data to be output to the sound wave converter. Accordingly, it is possible to efficiently transmit a signal with a low loss of sound wave signal. Thus, it is possible to simply construct communication hardware at a low price. | 08-05-2010 |
20100272156 | HUMAN BODY COMMUNICATION SYSTEM AND COMMUNICATION METHOD THEREOF - A human body communication system is provided. The human body communication system includes a transmitter and a receiver. The transmitter transmits a frame including a preamble, which is a Manchester-encoded pseudo noise (PN) code, to the human body. The receiver receives the frame from the human body, performs Manchester-decoding on the frame, performs cross-correlation on the decoding result and the PN code, and performs frame synchronization using the cross-correlation result. Accordingly, clock and data recovery performance is improved. Efficient frame synchronization with reduced computation amount can be provided. | 10-28-2010 |
20100274083 | HUMAN BODY COMMUNICATION SYSTEM AND METHOD - There is provided a human body communication system including: a wireless capsule injected into the body to acquire image information of the interior of the body and transmitting a signal with respect to the acquired information to the outside of the body from the inside of the body by using an electrode; and a portable data recorder performing, from the outside of the body, RF communication with the wireless capsule by the medium of the body, receiving the signal transmitted from the wireless capsule through an electrode in contact with the human body, processing the received signal into RF data, and storing the RF data. | 10-28-2010 |
20100290511 | ADAPTIVE FREQUENCY SELECTIVE BASEBAND COMMUNICATIONS METHOD USING ORTHOGONAL CODES - An adaptive frequency selective baseband communications method using orthogonal codes includes: a communications testing step of performing communications by using one of a plurality of codes each having a different frequency band; a proper code selecting step of selecting a proper code by using a correlation value of a plurality of codes included in test data transmitted in the communications testing step; a communications performing step of performing communications by using the proper code; and a feedback step of newly selecting a proper code by using the correlation value of the plurality of codes included in the test data transmitted in the communications performing step if a pre-set time duration has lapsed or if a reception error of more than a pre-set reference occurs, and performing the communications performing step again, wherein the test data transmitted in the communications testing step and the communications performing step includes a plurality of codes each having a different frequency band. | 11-18-2010 |
20110013545 | TDD COMMUNICATION APPARATUS AND OPERATION METHOD THEREOF - A Time Division Duplex (TDD) communication apparatus and an operation method thereof can provide operation clock signals in the transmission and reception of the TDD communication apparatus using a Clock Recovery & Data Retiming (CDR) circuit, thereby stabilizing an operation without any crystal oscillator and reducing the power consumption. In a transmission time interval, a transmitting frame is processed using a clock signal of a reference frequency generated from the CDR circuit. In a reception time interval, a receiving frame is processed using a clock signal recovered from the receiving frame by the CDR circuit. | 01-20-2011 |
20110029825 | APPARATUS AND METHOD FOR SYMBOL ERROR CORRECTABLE MODULATION AND DEMODULATION USING FREQUENCY SELECTIVE BASEBAND - Provided are symbol-error-correctable modulation and demodulation methods and apparatuses using a frequency selective baseband. The symbol-error-correctable frequency modulation method using a frequency selective baseband, includes: generating a plurality of subgroups by dividing 2N (N is a real number) spread codes or orthogonal codes used for frequency spreading into 2M (M02-03-2011 | |
20110058591 | FREQUENCY SELECTIVE MODULATING APPARATUS AND METHOD USING RE-SPREADING CODE - A frequency selective modulation apparatus and method using re-spreading codes are disclosed. The frequency selective modulation apparatus includes: a serial-to-parallel converter receiving transmission data and performing serial-to-parallel conversion on the transmission data at a pre-set ratio; one or more sub-frequency selective spreaders selecting one spreading code by using data bits received from the serial-to-parallel converter; a majority value selection unit selecting a majority value from one or more spreading codes which have been selected by each of the one or more of the sub-frequency selective spreaders; and a first XOR logic circuit XORing an output of the majority value selection unit and a re-spreading code Wn to re-spread a frequency selective baseband to a frequency selective passband. | 03-10-2011 |
20110123032 | SINGLE SOUND TRANSMISSION APPARATUS USING HUMAN BODY COMMUNICATON - Provided is a single sound transmission apparatus using human body communication. The single sound transmission apparatus includes a sound signal generator generating a sound signal of an audio frequency band, a high frequency signal generator generating a high frequency signal having a higher frequency than the audio frequency band, a signal combiner generating a combined signal by combining the sound signal with the high frequency signal, and a signal transmitter varying a phase difference between the combined signal outputted from the signal combiner and the high frequency signal outputted from the high frequency signal generator, and outputting the combined signal and the high frequency signal together to a human body, in order to leave only the sound signal through destructive interference of the high frequency signal of the combined signal, wherein the destructive interference is generated in an ear area of the human body. | 05-26-2011 |
20110148640 | CRIME PREVENTION SYSTEM USING HUMAN BODY COMMUNICATION AND CRIME PREVENTION METHOD USING HUMAN BODY COMMUNICATION - Disclosed are a crime prevention system using human body communication and a crime prevention method using human body communication capable of actively and effectively preventing a generation of a crime by using human body communication. The crime prevention system using human body communication includes: a monitoring device attached to a monitoring target to sense his physical contact with an observer and providing information obtained by monitoring the monitoring target through human body communication when body contact of the monitoring target with the observer is sensed; and a reception device attached to the observer, receiving the monitoring information through human body communication, and transmitting the monitoring information to a pre-set destination. A criminal act of the monitoring target may be prevented in advance, and when a criminal act is attempted, an observer who may fall a victim of the criminal act can actively cope with the situation. | 06-23-2011 |
20110182447 | HUMAN BODY SOUND TRANSMISSION APPARATUS - A provided a human body sound transmission apparatus includes: a processing unit processing an audio signal of an audio frequency band including data desired to be transmitted, an audio high frequency signal obtained by combining the audio signal and a first high frequency signal, and a second high frequency signal; and a transmission unit receiving a signal obtained by combining the audio high frequency signal and the second high frequency signal from the processing unit and transmitting the received signal by using a human body as a medium, wherein the audio high frequency signal and the second high frequency signal are combined to be transmitted by using the single transmission unit. | 07-28-2011 |