Patent application number | Description | Published |
20080238741 | SEMICONDUCTOR INTEGRATED CIRCUIT CAPABLE OF SCREENING CONFORMING DIGITAL-ANALOG CONVERTERS AND ANALOG-DIGITAL CONVERTERS TO BE MOUNTED BY AUTO-CORRELATION ARITHMETIC OPERATION - A semiconductor integrated circuit includes a test signal generating section which generates a test signal at the time of a test, a digital-analog converter which converts the test signal into an analog signal, an analog-digital converter which fetches a signal output from the digital-analog converter and converts the fetched signal into a digital signal, and an operating section which performs an auto-correlation arithmetic operation of a signal output from the analog-digital converter. The semiconductor integrated circuit further includes an evaluating section which evaluates presence/absence of distortion of the digital-analog converter and the analog-digital converter based on consistency of an auto-correlation arithmetic operation result in the operating section and a predetermined reference signal. | 10-02-2008 |
20080301524 | DECODER DEVICE AND METHOD FOR DECODING DATA STORED IN STORAGE MEDIUM - A decoder device includes: a decoder that decodes data stored in a storage medium by performing error correction on the data, the error correction being capable of correcting code error and code erasure included in the data; a memory that stores a history of an address in the storage medium of a code included in the data, the code being detected to have the code error by the decoding unit; and a controller that controls the decoder to change a detail of the error correction based on the history stored in the memory. | 12-04-2008 |
20090061780 | WIRELESS COMMUNICATION DEVICE AND SIGNAL DETECTION CIRCUIT - A wireless communication device includes: a wireless communication unit that is configured to: perform a wireless communication in a first mode using a first frequency band serving as a first communication channel; and perform the wireless communication in a second mode using a second frequency band including the first communication channel and a second communication channel that is adjacent to the first communication channel; a detection unit that is configured to: monitor each of the first frequency band and the second frequency band; output a first detection signal when an interference signal is detected in the first frequency band; and output a second detection signal when the interference signal is detected in the second frequency band; and a determination unit that determines whether the interference signal is in the first communication channel or in the second communication channel based on the first and second detection signals. | 03-05-2009 |
20090245125 | WIRELESS COMMUNICATION SYSTEM FOR REDUCING POWER CONSUMPTION WHEN RECEIVING A FRAME HAVING A LOW RECEPTION SUCCESS POSSIBILITY - A header analysis unit reads a parameter showing a format of a digital signal contained in a received signal. A received signal quality measurement unit measures a quality of the received signal. An awake/sleep control unit controls restart and sleep of a reception unit based on data from the header analysis unit and the received signal quality measurement unit. The awake/sleep control unit stops a reception operation for a period corresponding to a frame length when the quality of the leading portion of the received signal is less than a predetermined threshold. | 10-01-2009 |
20100020711 | COMMUNICATION DEVICE COMPRISING A CARRIER SENSE FUNCTION AND COMMUNICATION METHOD - A communication device of an example of the present invention comprises a first unit determining that whether a state is a first state indicating that a transmission medium is in use, a second state indicating that the transmission medium is not in use, or a third state indicating that whether or not the transmission medium is in use is being determined, and a second unit prohibiting a data transmission in the first and third states, and permitting the data transmission in the second state. | 01-28-2010 |
20100034182 | WIRELESS COMMUNICATION APPARATUS AND METHOD - When a wireless communication apparatus transmits a data frame requesting an ACK frame, it is expected that a receiver station will transmit the ACK frame. A preamble analyzer analyzes whether or not a preamble pattern added to the header of a received frame exists from the time it is expected that the ACK frame will be received. When a desired preamble pattern is detected, the preamble analyzer supplies instructions to start an operation of demodulating a reception signal to a demodulator via a controller. | 02-11-2010 |
20110068968 | RADAR DETECTION DEVICE USED IN WIRELESS COMMUNICATION DEVICE - A radar detection device of an example of the present invention includes a section which increments a value of a counter when a first difference value between a receiving power value in detecting an edge of a received signal of wireless communication and a receiving power value after a first time elapses since the edge detection is more than a first threshold, and a section which determines whether a second difference value between the value of the counter and a value of the counter before a third time is not lower than a second threshold in each of passage of a second time, and determines that radar is detected when the second difference value is not lower than the second threshold. | 03-24-2011 |
20110231738 | ERROR CORRECTION DECODING APPARATUS AND ERROR CORRECTION DECODING METHOD - According to one embodiment, an error correction decoding apparatus including a hard-decision decoding module which performs hard-decision decoding using a signal with 2 levels per bit as input data and runs a parity check on the input data, a soft-decision decoding module which performs soft-decision decoding using a signal with the number of multiple levels per bit larger than 2 as input data, a start-up control module which controls the start-up of each of the decoding modules, and an output selection module which selects one of the output signals of the decoding modules. The start-up control module causes the output selection module to select the decoding result of the hard-decision decoding module when the parity errors is a permitted value and causes the output selection module to select the decoding result of the soft-decision decoding module when the parity errors has exceeded the permitted value. | 09-22-2011 |
20110235753 | WIRELESS COMMUNICATION DEVICE AND WIRELESS COMMUNICATION METHOD - According to one embodiment, a wireless communication device includes a receiver, a physical layer processor, a MAC layer controller, and a channel setting unit. The receiver receives wireless signals received by using a plurality of communication channels as a baseband signal. The physical layer processor processes a physical layer of the baseband signal. The MAC layer controller recognizes a first frequency band used by a first communication channel, and determines whether a second frequency band is adjacent to the first frequency band or not. The channel setting unit supplies the first frequency band to the receiver, and controls the physical layer processor depending on information as to whether the first frequency band is adjacent to the second frequency band or not. | 09-29-2011 |
20110239092 | MEMORY SYSTEM - According to one embodiment, a memory system includes a semiconductor memory, a converter configured to convert an input data input from the semiconductor memory into a log likelihood ratio based on a conversion function, a conversion function optimizing unit configured to optimize the conversion function used for the converter, and a decoding operation unit configured to input the log likelihood ratio output from the converter to execute a decoding operation of an error correcting code. The conversion function optimizing unit optimizes the conversion function based on information related to a number of times of using the semiconductor memory. | 09-29-2011 |
20110267958 | WIRELESS COMMUNICATION DEVICE AND SIGNAL DETECTION CIRCUIT - A wireless communication device that includes a wireless communication unit that performs a wireless communication in a first mode using a first frequency band serving as a first communication channel, and performs the wireless communication in a second mode using a second frequency band including the first communication channel and a second communication channel that is adjacent to the first communication channel. Also included is a detection unit that monitors each of the first frequency band and the second frequency band, outputs a first detection signal when an interference signal is detected in the first frequency band and outputs a second detection signal when the interference signal is detected in the second frequency band. Further included is a determination unit that determines whether the interference signal is in the first communication channel or in the second communication channel based on the first and second detection signals. | 11-03-2011 |
20120082056 | COMMUNICATION DEVICE COMPRISING A CARRIER SENSE FUNCTION AND COMMUNICATION METHOD - A communication device of an example of the present invention comprises a first unit determining that whether a state is a first state indicating that a transmission medium is in use, a second state indicating that the transmission medium is not in use, or a third state indicating that whether or not the transmission medium is in use is being determined, and a second unit prohibiting a data transmission in the first and third states, and permitting the data transmission in the second state. | 04-05-2012 |
20120177136 | WIRELESS COMMUNICATION DEVICE - According to one embodiment, a wireless communication device which comprises an automatic frequency controller configured to detect a radio frequency shift amount between a transmitting side and a receiving side, comprises a controller, a first weight multiplier, and an error correction decoder. The controller is configured to designate subcarrier that suffers interference caused by a DC component based on the radio frequency shift amount detected by the automatic frequency controller. The first weight multiplier is configured to multiply amplitude values of demodulated signals of signals carried by the subcarriers designated by the controller by a weighting coefficient in a range from 0 to 1. The error correction decoder is configured to perform error correction of the demodulated signals multiplied by the weighting coefficient by the first weight multiplier. The controller sets the weighting coefficient to be multiplied by the first weight multiplier based on the radio frequency shift amount. | 07-12-2012 |
20130128817 | METHOD OF NOTIFYING FUNCTION IDENTIFICATION INFORMATION AND COMMUNICATION SYSTEM - There is disclosed a notification method in a communication system of notifying specific multifunctionality information between terminal stations. An expansion code is generated from both a user input code and a function identification code corresponding to a specific function. A transmission frame including the expansion code is also generated and transmitted to at least one of the terminal stations. | 05-23-2013 |
20130272717 | TRANSMISSION SYSTEM, TRANSMITTER AND RECEIVER - According to one embodiment, a transmission system includes a transmitter and a receiver. The transmitter includes a modulator configured to modulate transmission data at a chip rate to generate a modulation signal, and one or a plurality of light sources configured to emit visible light according to the modulation signal. The receiver includes a light receiver having one or more lines of light receiving elements to receive light in a first range including the visible light; and a demodulator configured to demodulate image data generated according to the light received by the light receiver to generate reception data corresponding to the transmission data. A following equation is satisfied ff10-17-2013 | |
20140173377 | MEMORY CONTROLLER, SEMICONDUCTOR STORAGE DEVICE, AND DECODING METHOD - According to an embodiment, a memory interface that includes n number of channels and writes data subjected to an error correction encoding process having capable of correcting t symbols, n number of first error correction decoding units that perform an error correction decoding process of correcting s (s06-19-2014 | |
20140274174 | APPARATUS AND METHOD FOR WIRELESS COMMUNICATION, HAVING FUNCTIONS OF DIFFERENT COMMUNICATION SYSTEMS - According to one embodiment, a wireless communication apparatus includes a first wireless communication unit, a second wireless communication unit, a reception power management unit, a frequency selection unit, and a frequency-hopping management unit. The second wireless communication unit performs wireless communication by means of a second wireless communication system different from the first communication system. The reception power management unit measures reception power. The frequency selection unit selects frequency-channel data enabling the second wireless communication unit to perform communication, on the basis of the reception power measured by the reception power management unit. The frequency-hopping management unit determines a frequency channel from the frequency-channel data selected by the frequency selection unit, if the second wireless communication unit performs communication by using a frequency hopping system. | 09-18-2014 |
20150036770 | RECEPTION APPARATUS AND RECEPTION METHOD - According to one embodiment, a reception apparatus is configured to receive a radio signal comprising a plurality of modulated subcarriers. The reception apparatus has a demodulator, a subcarrier specification module, and an error correction decoder. The demodulator is configured to demodulate the radio signal to generate the subcarriers. The subcarrier specification module is configured to specify a subcarrier whose frequency overlaps with a spurious frequency among the subcarriers. The error correction decoder is configured to perform error correction, relying more on the subcarriers whose frequencies do not overlap with the spurious frequency than on the subcarrier whose frequency overlaps with the spurious frequency. | 02-05-2015 |